ExpressionTests.cs

using System.Threading.Tasks;
using ICSharpCode.CodeConverter.Tests.TestRunners;
using Xunit;

namespace ICSharpCode.CodeConverter.Tests.CSharp.ExpressionTests;

public class ExpressionTests : ConverterTestBase
{
    [Fact]
    public async Task ComparingStringsUsesCoerceToNonNullOnlyWhenNeededAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod(a as String)
        Dim result = a = ("""")
        result = """" = a
        result = a = (String.Empty)
        result = String.Empty = a
        result = a = (Nothing)
        result = Nothing = a
        result = a Is Nothing
        result = a IsNot Nothing
        result = Not(a IsNot Nothing)
        result = a = a
        result = a = (""test"")
        result = ""test"" = a
    End Sub
End Class", @"
internal partial class TestClass
{
    private void TestMethod(string a)
    {
        bool result = string.IsNullOrEmpty(a);
        result = string.IsNullOrEmpty(a);
        result = string.IsNullOrEmpty(a);
        result = string.IsNullOrEmpty(a);
        result = string.IsNullOrEmpty(a);
        result = string.IsNullOrEmpty(a);
        result = a is null;
        result = a is not null;
        result = a is null;
        result = (a ?? """") == (a ?? """");
        result = a == ""test"";
        result = ""test"" == a;
    }
}");
    }

    [Fact]
    public async Task DynamicTestAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"
Public Class C
    Public Function IsPointWithinBoundaryBox(ByVal dblLat As Double, dblLon As Double, ByVal boundbox As Object) As Boolean
        If boundbox IsNot Nothing Then
            Dim boolInLatBounds As Boolean = (dblLat <= boundbox.north) And (dblLat >= boundbox.south) 'Less then highest (northmost) lat, AND more than lowest (southmost) lat
            Dim boolInLonBounds As Boolean = (dblLon >= boundbox.west) And (dblLon <= boundbox.east) 'More than lowest (westmost) lat, AND less than highest (eastmost) lon
            Return boolInLatBounds And boolInLonBounds
        Else
            'Throw New Exception(""boundbox is null."")
        End If
        Return False
    End Function
End Class
", @"using Microsoft.VisualBasic.CompilerServices; // Install-Package Microsoft.VisualBasic

public partial class C
{
    public bool IsPointWithinBoundaryBox(double dblLat, double dblLon, object boundbox)
    {
        if (boundbox is not null)
        {
            bool boolInLatBounds = Conversions.ToBoolean(Operators.AndObject(Operators.ConditionalCompareObjectLessEqual(dblLat, ((dynamic)boundbox).north, false), Operators.ConditionalCompareObjectGreaterEqual(dblLat, ((dynamic)boundbox).south, false))); // Less then highest (northmost) lat, AND more than lowest (southmost) lat
            bool boolInLonBounds = Conversions.ToBoolean(Operators.AndObject(Operators.ConditionalCompareObjectGreaterEqual(dblLon, ((dynamic)boundbox).west, false), Operators.ConditionalCompareObjectLessEqual(dblLon, ((dynamic)boundbox).east, false))); // More than lowest (westmost) lat, AND less than highest (eastmost) lon
            return boolInLatBounds & boolInLonBounds;
        }
        else
        {
            // Throw New Exception(""boundbox is null."")
        }
        return false;
    }
}");
    }

    [Fact]
    public async Task DynamicAccessAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Option Strict Off ' Directive gets removed

Public Class TestDynamicUsage
    Property Prop As Integer

    Sub S()
        Dim o As Object
        o = New TestDynamicUsage
        o.Prop = 1 'Must not cast to object here
    End Sub
End Class", @"
public partial class TestDynamicUsage
{
    public int Prop { get; set; }

    public void S()
    {
        object o;
        o = new TestDynamicUsage();
        ((dynamic)o).Prop = 1; // Must not cast to object here
    }
}");
    }

    [Fact]
    public async Task DynamicBoolAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"
Public Class C
    Public Function IsHybridApp() As Boolean
        Return New Object().Session(""hybrid"") IsNot Nothing AndAlso New Object().Session(""hybrid"") = 1
    End Function
End Class", @"using Microsoft.VisualBasic.CompilerServices; // Install-Package Microsoft.VisualBasic

public partial class C
{
    public bool IsHybridApp()
    {
        return Conversions.ToBoolean(((dynamic)new object()).Session(""hybrid"") is not null && Operators.ConditionalCompareObjectEqual(((dynamic)new object()).Session(""hybrid""), 1, false));
    }
}");
    }

    [Fact]
    public async Task ConversionOfNotUsesParensIfNeededAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod()
        Dim rslt = Not 1 = 2
        Dim rslt2 = Not True
        Dim rslt3 = TypeOf New Object() IsNot Boolean
    End Sub
End Class", @"
internal partial class TestClass
{
    private void TestMethod()
    {
        bool rslt = !(1 == 2);
        bool rslt2 = !true;
        bool rslt3 = !(new object() is bool);
    }
}");
    }

    [Fact]
    public async Task DateLiteralsAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod(Optional ByVal pDate As Date = #1/1/1900#)
        Dim rslt = #1/1/1900#
        Dim rslt2 = #8/13/2002 12:14 PM#
    End Sub
End Class", @"using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

internal partial class TestClass
{
    private void TestMethod([Optional, DateTimeConstant(599266080000000000L/* #1/1/1900# */)] DateTime pDate)
    {
        var rslt = DateTime.Parse(""1900-01-01"");
        var rslt2 = DateTime.Parse(""2002-08-13 12:14:00"");
    }
}");
    }

    [Fact]
    public async Task ImplicitCastToDoubleLiteralAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Class DoubleLiteral
    Private Function Test(myDouble As Double) As Double
        Return Test(2.37D) + Test(&HFFUL) 'VB: D means decimal, C#: D means double
    End Function
End Class", @"
internal partial class DoubleLiteral
{
    private double Test(double myDouble)
    {
        return Test(2.37d) + Test(255d); // VB: D means decimal, C#: D means double
    }
}");
    }

    [Fact]
    public async Task DateConstsAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class Issue213
    Const x As Date = #1990-1-1#

    Private Sub Y(Optional ByVal opt As Date = x)
    End Sub
End Class", @"using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

public partial class Issue213
{
    private static DateTime x = DateTime.Parse(""1990-01-01"");

    private void Y([Optional, DateTimeConstant(627667488000000000L/* Global.Issue213.x */)] DateTime opt)
    {
    }
}");
    }

    [Fact]
    public async Task MethodCallWithImplicitConversionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class Class1
    Sub Foo()
        Bar(True)
        Me.Bar(""4"")
        Dim ss(1) As String
        Dim y = ss(""0"")
    End Sub

    Sub Bar(x as Integer)
    End Sub
End Class", @"using Microsoft.VisualBasic.CompilerServices; // Install-Package Microsoft.VisualBasic

public partial class Class1
{
    public void Foo()
    {
        Bar(Conversions.ToInteger(true));
        Bar(Conversions.ToInteger(""4""));
        var ss = new string[2];
        string y = ss[Conversions.ToInteger(""0"")];
    }

    public void Bar(int x)
    {
    }
}");
    }

    [Fact]
    public async Task Issue580_EnumCastsAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"
Public Class EnumToString
    Enum Tes As Short
        None = 0
        TEST2 = 2
    End Enum
    Private Sub TEest2(aEnum As Tes)
        Dim sxtr_Tmp As String = ""Use"" & CShort(aEnum).ToString
        Dim si_Txt As Short = CShort(2 ^ Tes.TEST2)
    End Sub
End Class",
            @"using System;

public partial class EnumToString
{
    public enum Tes : short
    {
        None = 0,
        TEST2 = 2
    }
    private void TEest2(Tes aEnum)
    {
        string sxtr_Tmp = ""Use"" + ((short)aEnum).ToString();
        short si_Txt = (short)Math.Round(Math.Pow(2d, (double)Tes.TEST2));
    }
}");
    }

    [Fact]
    public async Task IntToEnumArgAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class Class1
    Sub Foo(ByVal arg As TriState)
    End Sub

    Sub Main()
        Foo(0)
    End Sub
End Class",
            @"using Microsoft.VisualBasic; // Install-Package Microsoft.VisualBasic

public partial class Class1
{
    public void Foo(TriState arg)
    {
    }

    public void Main()
    {
        Foo(0);
    }
}");
    }

    [Fact] // https://github.com/icsharpcode/CodeConverter/issues/636
    public async Task CharacterizeCompilationErrorsWithLateBoundImplicitObjectNarrowingAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class VisualBasicClass
    Public Sub Rounding()
        Dim o as Object = 3.0f
        Dim x = Math.Round(o, 2)
    End Sub
End Class",
            @"using System;

public partial class VisualBasicClass
{
    public void Rounding()
    {
        object o = 3.0f;
        var x = Math.Round(o, 2);
    }
}
1 target compilation errors:
CS1503: Argument 1: cannot convert from 'object' to 'decimal'");
    }

    [Fact]
    public async Task EnumToIntCastAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class MyTest
    Public Enum TestEnum As Integer
        Test1 = 0
        Test2 = 1
    End Enum

    Sub Main()
        Dim EnumVariable = TestEnum.Test1
        Dim t1 As Integer = EnumVariable
    End Sub
End Class",
            @"
public partial class MyTest
{
    public enum TestEnum : int
    {
        Test1 = 0,
        Test2 = 1
    }

    public void Main()
    {
        var EnumVariable = TestEnum.Test1;
        int t1 = (int)EnumVariable;
    }
}
");
    }

    [Fact]
    public async Task FlagsEnumAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"<Flags()> Public Enum FilePermissions As Integer
    None = 0
    Create = 1
    Read = 2
    Update = 4
    Delete = 8
End Enum
Public Class MyTest
    Public MyEnum As FilePermissions = FilePermissions.None + FilePermissions.Create
End Class",
            @"using System;

[Flags()]
public enum FilePermissions : int
{
    None = 0,
    Create = 1,
    Read = 2,
    Update = 4,
    Delete = 8
}

public partial class MyTest
{
    public FilePermissions MyEnum = (FilePermissions)((int)FilePermissions.None + (int)FilePermissions.Create);
}");
    }

    [Fact]
    public async Task EnumSwitchAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class Class1
    Enum E
        A
    End Enum

    Sub Main()
        Dim e1 = E.A
        Dim e2 As Integer
        Select Case e1
            Case 0
        End Select

        Select Case e2
            Case E.A
        End Select

    End Sub
End Class",
            @"
public partial class Class1
{
    public enum E
    {
        A
    }

    public void Main()
    {
        var e1 = E.A;
        var e2 = default(int);
        switch (e1)
        {
            case 0:
                {
                    break;
                }
        }

        switch (e2)
        {
            case (int)E.A:
                {
                    break;
                }
        }

    }
}");
    }

    [Fact]
    public async Task DuplicateCaseDiscardedAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Imports System
    Friend Module Module1
    Sub Main()
        Select Case 1
            Case 1
                Console.WriteLine(""a"")

            Case 1
                Console.WriteLine(""b"")

        End Select

    End Sub
End Module",
            @"using System;

internal static partial class Module1
{
    public static void Main()
    {
        switch (1)
        {
            case 1:
                {
                    Console.WriteLine(""a"");
                    break;
                }

            case var @case when @case == 1:
                {
                    Console.WriteLine(""b"");
                    break;
                }

        }

    }
}
1 target compilation errors:
CS0825: The contextual keyword 'var' may only appear within a local variable declaration or in script code");
        //BUG: Correct textual output, but requires var pattern syntax construct not available before CodeAnalysis 3
    }

    [Fact]
    public async Task MethodCallWithoutParensAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class Class1
    Sub Foo()
        Dim w = Bar
        Dim x = Me.Bar
        Dim y = Baz()
        Dim z = Me.Baz()
    End Sub

    Function Bar() As Integer
        Return 1
    End Function
    Property Baz As Integer
End Class", @"
public partial class Class1
{
    public void Foo()
    {
        int w = Bar();
        int x = Bar();
        int y = Baz;
        int z = Baz;
    }

    public int Bar()
    {
        return 1;
    }
    public int Baz { get; set; }
}");
    }

    [Fact]
    public async Task ConversionOfCTypeUsesParensIfNeededAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod()
        Dim rslt = Ctype(true, Object).ToString()
        Dim rslt2 = Ctype(true, Object)
    End Sub
End Class", @"
internal partial class TestClass
{
    private void TestMethod()
    {
        string rslt = true.ToString();
        object rslt2 = true;
    }
}");
    }

    [Fact]
    public async Task DateKeywordAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private DefaultDate as Date = Nothing
End Class", @"using System;

internal partial class TestClass
{
    private DateTime DefaultDate = default;
}");
    }

    [Fact]
    public async Task IfNothingAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Imports System

Public Class VisualBasicClass
        Dim SomeDate = """"
        Dim SomeDateDateNothing As Date? = If(String.IsNullOrEmpty(SomeDate), Nothing, DateTime.Parse(SomeDate))
        Dim isNotNothing = SomeDateDateNothing IsNot Nothing
        Dim isSomething = SomeDateDateNothing = New Date()
End Class", @"using System;
using Microsoft.VisualBasic.CompilerServices; // Install-Package Microsoft.VisualBasic

public partial class VisualBasicClass
{
    private object SomeDate = """";
    private DateTime? SomeDateDateNothing;
    private object isNotNothing;
    private object isSomething;

    public VisualBasicClass()
    {
        SomeDateDateNothing = string.IsNullOrEmpty(Conversions.ToString(SomeDate)) ? (object)null : DateTime.Parse(SomeDate);
        isNotNothing = SomeDateDateNothing is not null;
        isSomething = new DateTime() is var arg1 && SomeDateDateNothing.HasValue ? SomeDateDateNothing.Value == arg1 : (bool?)null;
    }
}
1 target compilation errors:
CS1503: Argument 1: cannot convert from 'object' to 'System.ReadOnlySpan<char>'");
    }

    [Fact]
    public async Task CTypeNothingAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Imports System

Public Class VisualBasicClass
    Dim SomeDate As String = ""2022-01-01""
    Dim SomeDateDateParsed As Date? = If(String.IsNullOrEmpty(SomeDate), CType(Nothing, Date?), DateTime.Parse(SomeDate))
End Class", @"using System;

public partial class VisualBasicClass
{
    private string SomeDate = ""2022-01-01"";
    private DateTime? SomeDateDateParsed;

    public VisualBasicClass()
    {
        SomeDateDateParsed = string.IsNullOrEmpty(SomeDate) ? default(DateTime?) : DateTime.Parse(SomeDate);
    }
}");
    }

    [Fact]
    public async Task NullConditionalIndexer_Issue993Async()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class VisualBasicClass

    Private Function TestMethod(testArray As Object()) As Boolean
        Return Not String.IsNullOrWhiteSpace(testArray?(0)?.ToString())
    End Function
    
End Class", @"
public partial class VisualBasicClass
{

    private bool TestMethod(object[] testArray)
    {
        return !string.IsNullOrWhiteSpace(testArray?[0]?.ToString());
    }

}");
    }

    [Fact]
    public async Task GenericComparisonAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class GenericComparison
    Public Sub m(Of T)(p As T)
        If p Is Nothing Then Return
    End Sub
End Class", @"
public partial class GenericComparison
{
    public void m<T>(T p)
    {
        if (p is null)
            return;
    }
}");
    }

    [Fact]
    public async Task AccessSharedThroughInstanceAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class A
    Public Shared x As Integer = 2
    Public Sub Test()
        Dim tmp = Me
        Dim y = Me.x
        Dim z = tmp.x
    End Sub
End Class", @"
public partial class A
{
    public static int x = 2;
    public void Test()
    {
        var tmp = this;
        int y = x;
        int z = x;
    }
}");
    }

    [Fact]
    public async Task EmptyArrayExpressionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"
Public Class Issue495AndIssue713
    Public Function Empty() As Integer()
        Dim emptySingle As IEnumerable(Of Integer) = {}
        Dim initializedSingle As IEnumerable(Of Integer) = {1}
        Dim emptyNested As Integer()() = {}
        Dim initializedNested(1)() As Integer
        Dim empty2d As Integer(,) = {{}}
        Dim initialized2d As Integer(,) = {{1}}
        Return {}
    End Function
End Class", @"using System;
using System.Collections.Generic;

public partial class Issue495AndIssue713
{
    public int[] Empty()
    {
        IEnumerable<int> emptySingle = Array.Empty<int>();
        IEnumerable<int> initializedSingle = new[] { 1 };
        int[][] emptyNested = Array.Empty<int[]>();
        var initializedNested = new int[2][];
        int[,] empty2d = new int[,] { { } };
        int[,] initialized2d = new[,] { { 1 } };
        return Array.Empty<int>();
    }
}");
    }

    [Fact]
    public async Task InitializedArrayExpressionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"
Public Class Issue713
    Public Function Empty() As Integer()
        Dim initializedSingle As IEnumerable(Of Integer) = {1}
        Dim initialized2d As Integer(,) = {{1}}
        Return {}
    End Function
End Class", @"using System;
using System.Collections.Generic;

public partial class Issue713
{
    public int[] Empty()
    {
        IEnumerable<int> initializedSingle = new[] { 1 };
        int[,] initialized2d = new[,] { { 1 } };
        return Array.Empty<int>();
    }
}");
    }

    [Fact]
    public async Task EmptyArrayParameterAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class VisualBasicClass
    Public Sub s()
        If Validate({}) Then
        End If
    End Sub
    Private Function Validate(w As IEnumerable(Of Int16)) As Boolean
        Return True
    End Function
End Class", @"using System;
using System.Collections.Generic;

public partial class VisualBasicClass
{
    public void s()
    {
        if (Validate(Array.Empty<short>()))
        {
        }
    }
    private bool Validate(IEnumerable<short> w)
    {
        return true;
    }
}");
    }

    [Fact]
    public async Task Empty2DArrayExpressionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"
Public Class Empty2DArray
    Dim data(,) As Double = {}
End Class", @"
public partial class Empty2DArray
{
    private double[,] data = new double[,] { };
}");
    }

    [Fact]
    public async Task ReducedTypeParametersInferrableAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Imports System.Linq

Public Class Class1
    Sub Foo()
        Dim y = """".Split("",""c).Select(Of String)(Function(x) x)
    End Sub
End Class", @"using System.Linq;

public partial class Class1
{
    public void Foo()
    {
        var y = """".Split(',').Select(x => x);
    }
}");
    }

    [Fact]
    public async Task ReducedTypeParametersNonInferrableAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Imports System.Linq

Public Class Class1
    Sub Foo()
        Dim y = """".Split("",""c).Select(Of Object)(Function(x) x)
    End Sub
End Class", @"using System.Linq;

public partial class Class1
{
    public void Foo()
    {
        var y = """".Split(',').Select<string, object>(x => x);
    }
}");
    }

    [Fact]
    public async Task EnumNullableConversionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class Class1
    Sub Main()
        Dim x = DayOfWeek.Monday
        Foo(x)
    End Sub

    Sub Foo(x As DayOfWeek?)

    End Sub
End Class", @"using System;

public partial class Class1
{
    public void Main()
    {
        var x = DayOfWeek.Monday;
        Foo(x);
    }

    public void Foo(DayOfWeek? x)
    {

    }
}");
    }

    [Fact]
    public async Task UninitializedVariableAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class Class1
    Sub New()
        Dim needsInitialization As Integer
        Dim notUsed As Integer
        Dim y = needsInitialization
    End Sub

    Sub Foo()
        Dim needsInitialization As Integer
        Dim notUsed As Integer
        Dim y = needsInitialization
    End Sub

    Sub Bar()
        Dim i As Integer, temp As String = String.Empty
        i += 1
    End Sub

    Sub Bar2()
        Dim i As Integer, temp As String = String.Empty
        i = i + 1
    End Sub

    Sub Bar3()
        Dim i As Integer, temp As String = String.Empty
        Dim k As Integer = i + 1
    End Sub

    Sub Bar4()
        Dim i As Integer, temp As String = String.Empty
        Dim k As Integer = i + 1
        i = 1
    End Sub

    Public ReadOnly Property State As Integer
        Get
            Dim needsInitialization As Integer
            Dim notUsed As Integer
            Dim y = needsInitialization
            Return y
        End Get
    End Property
End Class", @"
public partial class Class1
{
    public Class1()
    {
        var needsInitialization = default(int);
        int notUsed;
        int y = needsInitialization;
    }

    public void Foo()
    {
        var needsInitialization = default(int);
        int notUsed;
        int y = needsInitialization;
    }

    public void Bar()
    {
        var i = default(int);
        string temp = string.Empty;
        i += 1;
    }

    public void Bar2()
    {
        var i = default(int);
        string temp = string.Empty;
        i = i + 1;
    }

    public void Bar3()
    {
        var i = default(int);
        string temp = string.Empty;
        int k = i + 1;
    }

    public void Bar4()
    {
        var i = default(int);
        string temp = string.Empty;
        int k = i + 1;
        i = 1;
    }

    public int State
    {
        get
        {
            var needsInitialization = default(int);
            int notUsed;
            int y = needsInitialization;
            return y;
        }
    }
}");
    }

    [Fact]
    public async Task FullyTypeInferredEnumerableCreationAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod()
        Dim strings = { ""1"", ""2"" }
    End Sub
End Class", @"
internal partial class TestClass
{
    private void TestMethod()
    {
        string[] strings = new[] { ""1"", ""2"" };
    }
}");
    }

    [Fact]
    public async Task GetTypeExpressionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod()
        Dim typ = GetType(String)
    End Sub
End Class", @"
internal partial class TestClass
{
    private void TestMethod()
    {
        var typ = typeof(string);
    }
}");
    }

    [Fact]
    public async Task NullableIntegerAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Public Function Bar(value As String) As Integer?
        Dim result As Integer
        If Integer.TryParse(value, result) Then
            Return result
        Else
            Return Nothing
        End If
    End Function
End Class", @"
internal partial class TestClass
{
    public int? Bar(string value)
    {
        int result;
        if (int.TryParse(value, out result))
        {
            return result;
        }
        else
        {
            return default;
        }
    }
}");
    }

    [Fact]
    public async Task NothingInvokesDefaultForValueTypesAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Public Sub Bar()
        Dim number As Integer
        number = Nothing
        Dim dat As Date
        dat = Nothing
    End Sub
End Class", @"using System;

internal partial class TestClass
{
    public void Bar()
    {
        int number;
        number = default;
        DateTime dat;
        dat = default;
    }
}");
    }

    [Fact]
    public async Task ConditionalExpressionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod(ByVal str As String)
        Dim result As Boolean = If((str = """"), True, False)
    End Sub
End Class", @"
internal partial class TestClass
{
    private void TestMethod(string str)
    {
        bool result = string.IsNullOrEmpty(str) ? true : false;
    }
}");
    }

    [Fact]
    public async Task ConditionalExpressionInStringConcatAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class ConditionalExpressionInStringConcat
    Private Sub TestMethod(ByVal str As String)
        Dim appleCount as integer = 42
        Console.WriteLine(""I have "" & appleCount & If(appleCount = 1, "" apple"", "" apples""))
    End Sub
End Class", @"using System;

internal partial class ConditionalExpressionInStringConcat
{
    private void TestMethod(string str)
    {
        int appleCount = 42;
        Console.WriteLine(""I have "" + appleCount + (appleCount == 1 ? "" apple"" : "" apples""));
    }
}");
    }

    [Fact]
    public async Task ConditionalExpressionInUnaryExpressionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod(ByVal str As String)
        Dim result As Boolean = Not If((str = """"), True, False)
    End Sub
End Class", @"
internal partial class TestClass
{
    private void TestMethod(string str)
    {
        bool result = !(string.IsNullOrEmpty(str) ? true : false);
    }
}");
    }

    [Fact]
    public async Task NullCoalescingExpressionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod(ByVal str As String)
        Console.WriteLine(If(str, ""<null>""))
    End Sub
End Class", @"using System;

internal partial class TestClass
{
    private void TestMethod(string str)
    {
        Console.WriteLine(str ?? ""<null>"");
    }
}");
    }

    [Fact]
    public async Task OmittedArgumentInInvocationAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Imports System

Public Module MyExtensions
    public sub NewColumn(type As Type , Optional strV1 As String = nothing, Optional code As String = ""code"", Optional argInt as Integer = 1)
    End sub

    public Sub CallNewColumn()
        NewColumn(GetType(MyExtensions))
        NewColumn(Nothing, , ""otherCode"")
        NewColumn(Nothing, ""fred"")
        NewColumn(Nothing, , argInt:=2)
    End Sub
End Module", @"using System;

public static partial class MyExtensions
{
    public static void NewColumn(Type @type, string strV1 = null, string code = ""code"", int argInt = 1)
    {
    }

    public static void CallNewColumn()
    {
        NewColumn(typeof(MyExtensions));
        NewColumn(null, code: ""otherCode"");
        NewColumn(null, ""fred"");
        NewColumn(null, argInt: 2);
    }
}");
    }

    [Fact]
    public async Task OmittedArgumentInCallInvocationAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class Issue445MissingParameter
    Public Sub First(a As String, b As String, c As Integer)
        Call mySuperFunction(7, , New Object())
    End Sub

    Private Sub mySuperFunction(intSomething As Integer, Optional p As Object = Nothing, Optional optionalSomething As Object = Nothing)
        Throw New NotImplementedException()
    End Sub
End Class", @"using System;

public partial class Issue445MissingParameter
{
    public void First(string a, string b, int c)
    {
        mySuperFunction(7, optionalSomething: new object());
    }

    private void mySuperFunction(int intSomething, object p = null, object optionalSomething = null)
    {
        throw new NotImplementedException();
    }
}");
    }

    [Fact]
    public async Task ExternalReferenceToOutParameterAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod(ByVal str As String)
        Dim d = New Dictionary(Of string, string)
        Dim s As String
        d.TryGetValue(""a"", s)
    End Sub
End Class", @"using System.Collections.Generic;

internal partial class TestClass
{
    private void TestMethod(string str)
    {
        var d = new Dictionary<string, string>();
        string s;
        d.TryGetValue(""a"", out s);
    }
}");
    }

        
    [Fact]
    public async Task ExternalReferenceToOutParameterFromInterfaceImplementationAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"
MustInherit Class TestClass
    Implements IReadOnlyDictionary(Of Integer, Integer)
    Public Function TryGetValue(key as Integer, ByRef value As Integer) As Boolean Implements IReadOnlyDictionary(Of Integer, Integer).TryGetValue
        value = key
    End Function

    Private Sub TestMethod()
        Dim value As Integer
        Me.TryGetValue(5, value)
    End Sub

    Public MustOverride Function ContainsKey(key As Integer) As Boolean Implements IReadOnlyDictionary(Of Integer, Integer).ContainsKey
    Public MustOverride Function GetEnumerator() As IEnumerator(Of KeyValuePair(Of Integer, Integer)) Implements IEnumerable(Of KeyValuePair(Of Integer, Integer)).GetEnumerator
    Public MustOverride Function IEnumerable_GetEnumerator() As IEnumerator Implements IEnumerable.GetEnumerator
    Default Public MustOverride ReadOnly Property Item(key As Integer) As Integer Implements IReadOnlyDictionary(Of Integer, Integer).Item
    Public MustOverride ReadOnly Property Keys As IEnumerable(Of Integer) Implements IReadOnlyDictionary(Of Integer, Integer).Keys
    Public MustOverride ReadOnly Property Values As IEnumerable(Of Integer) Implements IReadOnlyDictionary(Of Integer, Integer).Values
    Public MustOverride ReadOnly Property Count As Integer Implements IReadOnlyCollection(Of KeyValuePair(Of Integer, Integer)).Count
End Class", @"using System.Collections;
using System.Collections.Generic;

internal abstract partial class TestClass : IReadOnlyDictionary<int, int>
{
    public bool TryGetValue(int key, out int value)
    {
        value = key;
        return default;
    }

    private void TestMethod()
    {
        var value = default(int);
        TryGetValue(5, out value);
    }

    public abstract bool ContainsKey(int key);
    public abstract IEnumerator<KeyValuePair<int, int>> GetEnumerator();
    public abstract IEnumerator IEnumerable_GetEnumerator();
    IEnumerator IEnumerable.GetEnumerator() => IEnumerable_GetEnumerator();
    public abstract int this[int key] { get; }
    public abstract IEnumerable<int> Keys { get; }
    public abstract IEnumerable<int> Values { get; }
    public abstract int Count { get; }
}");
    }

    [Fact]
    public async Task ElvisOperatorExpressionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass3
    Private Class Rec
        Public ReadOnly Property Prop As New Rec
    End Class
    Private Function TestMethod(ByVal str As String) As Rec
        Dim length As Integer = If(str?.Length, -1)
        Console.WriteLine(length)
        Console.ReadKey()
        Return New Rec()?.Prop?.Prop?.Prop
    End Function
End Class", @"using System;

internal partial class TestClass3
{
    private partial class Rec
    {
        public Rec Prop { get; private set; } = new Rec();
    }
    private Rec TestMethod(string str)
    {
        int length = (str?.Length) ?? -1;
        Console.WriteLine(length);
        Console.ReadKey();
        return new Rec()?.Prop?.Prop?.Prop;
    }
}");
    }

    [Fact]
    public async Task ObjectInitializerExpressionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class StudentName
    Public LastName, FirstName As String
End Class

Class TestClass
    Private Sub TestMethod(ByVal str As String)
        Dim student2 As StudentName = New StudentName With {.FirstName = ""Craig"", .LastName = ""Playstead""}
    End Sub
End Class", @"
internal partial class StudentName
{
    public string LastName, FirstName;
}

internal partial class TestClass
{
    private void TestMethod(string str)
    {
        var student2 = new StudentName() { FirstName = ""Craig"", LastName = ""Playstead"" };
    }
}");
    }

    [Fact]
    public async Task ObjectInitializerWithInferredNameAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class Issue480
    Public Foo As Integer

    Sub Test()
        Dim x = New With {Foo}
    End Sub

End Class", @"
internal partial class Issue480
{
    public int Foo;

    public void Test()
    {
        var x = new { Foo };
    }

}");
    }

    [Fact]
    public async Task Issue949_AnonymousWithBlockMemberSelfAccessAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Dim anonymousType1 = New With {
    Key .A = 1,
    Key .B = .A
}
Dim anonymousType2 = New With {
    Key .A = 2,
    Key .B = .A
}", @"{
    var anonymousType1 = new
    {
        A = 1 is var tempA ? tempA : default,
        B = tempA
    };
    var anonymousType2 = new
    {
        A = 2 is var tempA1 ? tempA1 : default,
        B = tempA1
    };
}");
    }

    [Fact]
    public async Task Issue949_AnonymousWithNestedBlockMemberSelfAccessAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Dim anonymousType = New With {
Key .A = 1, 'Comment gets duplicated
Key .B = New With {
        Key .A = 2,
        Key .B = .A
    }
}", @"{
    var anonymousType = new
    {
        A = 1, // Comment gets duplicated
               // Comment gets duplicated
        B = new
        {
            A = 2 is var tempA ? tempA : default,
            B = tempA
        }
    };
}");
    }

    [Fact]
    public async Task ObjectInitializerExpression2Async()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod(ByVal str As String)
        Dim student2 = New With {Key .FirstName = ""Craig"", Key .LastName = ""Playstead""}
    End Sub
End Class", @"
internal partial class TestClass
{
    private void TestMethod(string str)
    {
        var student2 = new { FirstName = ""Craig"", LastName = ""Playstead"" };
    }
}");
    }

    [Fact]
    public async Task WithObjectInitializerCanReadFromPropertiesOfObjectAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class SomeClass
    Public SomeProperty As String
    Public Shared Instance As SomeClass = New SomeClass() With { ' First line gets moved
             .SomeProperty = .SomeProperty + NameOf(.SomeProperty) ' Second line gets moved
        } ' Third line gets moved
End Class", @"
public partial class SomeClass
{
    public string SomeProperty;
    static SomeClass initInstance()
    {
        var init = new SomeClass();
        return (init.SomeProperty = init.SomeProperty + nameof(init.SomeProperty), init).init; // Second line gets moved
    } // Third line gets moved

    public static SomeClass Instance = initInstance(); // First line gets moved
}");
    }

    [Fact]
    public async Task CollectionInitializersAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub DoStuff(a As Object)
    End Sub
    Private Sub TestMethod()
        DoStuff({1, 2})
        Dim intList As New List(Of Integer) From {1}
        Dim dict As New Dictionary(Of Integer, Integer) From {{1, 2}, {3, 4}}
    End Sub
End Class", @"using System.Collections.Generic;

internal partial class TestClass
{
    private void DoStuff(object a)
    {
    }
    private void TestMethod()
    {
        DoStuff(new[] { 1, 2 });
        var intList = new List<int>() { 1 };
        var dict = new Dictionary<int, int>() { { 1, 2 }, { 3, 4 } };
    }
}");
    }

    [Fact]
    public async Task DelegateExpressionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod()
        Dim test As Func(Of Integer, Integer) = Function(ByVal a As Integer) a * 2
        test(3)
    End Sub
End Class", @"using System;

internal partial class TestClass
{
    private void TestMethod()
    {
        Func<int, int> test = (a) => a * 2;
        test(3);
    }
}");
    }

    [Fact]
    public async Task Issue1148_AddressOfSignatureCompatibilityAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"
Imports System

Public Class Issue1148
    Public Shared FuncClass As Func(Of TestObjClass) = AddressOf FunctionReturningClass
    Public Shared FuncBaseClass As Func(Of TestBaseObjClass) = AddressOf FunctionReturningClass
    Public Shared FuncInterface As Func(Of ITestObj) = AddressOf FunctionReturningClass
    Public Shared FuncInterfaceParam As Func(Of ITestObj, ITestObj) = AddressOf CastObj
    Public Shared FuncClassParam As Func(Of TestObjClass, ITestObj) = AddressOf CastObj

    Public Shared Function FunctionReturningClass() As TestObjClass
        Return New TestObjClass()
    End Function

    Public Shared Function CastObj(obj As ITestObj) As TestObjClass
        Return CType(obj, TestObjClass)
    End Function

End Class

Public Class TestObjClass
    Inherits TestBaseObjClass
    Implements ITestObj
End Class

Public Class TestBaseObjClass
End Class

Public Interface ITestObj
End Interface
", @"
using System;

public partial class Issue1148
{
    public static Func<TestObjClass> FuncClass = FunctionReturningClass;
    public static Func<TestBaseObjClass> FuncBaseClass = FunctionReturningClass;
    public static Func<ITestObj> FuncInterface = FunctionReturningClass;
    public static Func<ITestObj, ITestObj> FuncInterfaceParam = CastObj;
    public static Func<TestObjClass, ITestObj> FuncClassParam = CastObj;

    public static TestObjClass FunctionReturningClass()
    {
        return new TestObjClass();
    }

    public static TestObjClass CastObj(ITestObj obj)
    {
        return (TestObjClass)obj;
    }

}

public partial class TestObjClass : TestBaseObjClass, ITestObj
{
}

public partial class TestBaseObjClass
{
}

public partial interface ITestObj
{
}
");
    }

    [Fact]
    public async Task LambdaImmediatelyExecutedAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class Issue869
    Sub Main
        Dim i As Integer = Function() 
                                Return 2 
                        End Function() 
        Console.WriteLine(i)
    End Sub
End Class", @"using System;

public partial class Issue869
{
    public void Main()
    {
        int i = new Func<int>(() => 2)();


        Console.WriteLine(i);
    }
}");
    }

    [Fact]
    public async Task LambdaBodyExpressionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod()
        Dim test As Func(Of Integer, Integer) = Function(a) a * 2
        Dim test2 As Func(Of Integer, Integer, Double) = Function(a, b)
            If b > 0 Then Return a / b
            Return 0
        End Function

        Dim test3 As Func(Of Integer, Integer, Integer) = Function(a, b) a Mod b
        test(3)
    End Sub
End Class", @"using System;

internal partial class TestClass
{
    private void TestMethod()
    {
        Func<int, int> test = a => a * 2;
        Func<int, int, double> test2 = (a, b) =>
        {
            if (b > 0)
                return a / (double)b;
            return 0d;
        };

        Func<int, int, int> test3 = (a, b) => a % b;
        test(3);
    }
}");
    }

    [Fact]
    public async Task AsyncLambdaBodyExpressionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Async Sub TestMethod()
        Dim test0 As Func(Of Task(Of Integer)) = Async Function()  2
        Dim test1 As Func(Of Integer, Task(Of Integer)) = Async Function(a) a * 2
        Dim test2 As Func(Of Integer, Integer, Task(Of Double)) = Async Function(a, b)
            If b > 0 Then Return a / b
            Return 0
        End Function

        Dim test3 As Func(Of Integer, Integer, Task(Of Integer)) = Async Function(a, b) a Mod b
        Dim test4 As Func(Of Task(Of Integer)) = Async Function()  
            dim i as Integer = 2
            dim x as Integer = 3
            return 3
        End Function
        
Await test1(3)
    End Sub
End Class", @"using System;
using System.Threading.Tasks;

internal partial class TestClass
{
    private async void TestMethod()
    {
        Func<Task<int>> test0 = async () => 2;
        Func<int, Task<int>> test1 = async a => a * 2;
        Func<int, int, Task<double>> test2 = async (a, b) =>
        {
            if (b > 0)
                return a / (double)b;
            return 0d;
        };

        Func<int, int, Task<int>> test3 = async (a, b) => a % b;
        Func<Task<int>> test4 = async () =>
        {
            int i = 2;
            int x = 3;
            return 3;
        };

        await test1(3);
    }
}");
    }

    [Fact]
    public async Task AsyncLambdaParameterAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
        public Async Function mySub() As Task(Of Boolean)
            Return Await Me.ExecuteAuthenticatedAsync(Async Function() As Task(Of Boolean)
                Return Await DoSomethingAsync()
            End Function)

        End Function
        Private Async Function ExecuteAuthenticatedAsync(myFunc As Func(Of Task(Of Boolean))) As Task(Of Boolean)
            Return Await myFunc()
        End Function
        Private  Async Function DoSomethingAsync() As Task(Of Boolean)
            Return True
        End Function
End Class", @"using System;
using System.Threading.Tasks;

internal partial class TestClass
{
    public async Task<bool> mySub()
    {
        return await ExecuteAuthenticatedAsync(async () => await DoSomethingAsync());

    }
    private async Task<bool> ExecuteAuthenticatedAsync(Func<Task<bool>> myFunc)
    {
        return await myFunc();
    }
    private async Task<bool> DoSomethingAsync()
    {
        return true;
    }
}");
    }

    [Fact]
    public async Task TypeInferredLambdaBodyExpressionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod()
        Dim test = Function(a) a * 2
        Dim test2 = Function(a, b)
            If b > 0 Then Return a / b
            Return 0
        End Function

        Dim test3 = Function(a, b) a Mod b
        test(3)
    End Sub
End Class", @"using Microsoft.VisualBasic.CompilerServices; // Install-Package Microsoft.VisualBasic

internal partial class TestClass
{
    private void TestMethod()
    {
        object test(object a) => Operators.MultiplyObject(a, 2);
        object test2(object a, object b)
        {
            if (Conversions.ToBoolean(Operators.ConditionalCompareObjectGreater(b, 0, false)))
                return Operators.DivideObject(a, b);
            return 0;
        };

        object test3(object a, object b) => Operators.ModObject(a, b);
        test(3);
    }
}");
    }

    [Fact]
    public async Task Issue316_LambdaExpressionEqualityCheckAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Option Compare Text
Imports System.Linq.Expressions

Class TestClass
    Private Sub TestMethod(a as String, b as String)
        Dim test As Expression(Of Func(Of Boolean)) = Function() a = b
        test.Compile()()
    End Sub
End Class", @"using System;
using System.Linq.Expressions;

internal partial class TestClass
{
    private void TestMethod(string a, string b)
    {
        Expression<Func<bool>> test = () => a == b;
        test.Compile()();
    }
}");
    }

    [Fact]
    public async Task Issue930_LambdaExpressionEqualityCheckAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Option Compare Text
Imports System.Linq.Expressions

Class TestClass
    Private Sub TestMethod(a as Object)
        Dim test As Expression(Of Func(Of Boolean)) = Function() a = Nothing
        test.Compile()()
    End Sub
End Class", @"using System;
using System.Linq.Expressions;

internal partial class TestClass
{
    private void TestMethod(object a)
    {
        Expression<Func<bool>> test = () => a == default;
        test.Compile()();
    }
}");
    }

    [Fact]
    public async Task SingleLineLambdaWithStatementBodyAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Sub TestMethod()
        Dim x = 1
        Dim simpleAssignmentAction As System.Action = Sub() x = 1
        Dim nonBlockAction As System.Action = Sub() Console.WriteLine(""Statement"")
        Dim ifAction As Action = Sub() If True Then Exit Sub
    End Sub
End Class", @"using System;

internal partial class TestClass
{
    private void TestMethod()
    {
        int x = 1;
        Action simpleAssignmentAction = () => x = 1;
        Action nonBlockAction = () => Console.WriteLine(""Statement"");
        Action ifAction = () => { if (true) return; };
    }
}");
    }

    [Fact]
    public async Task AnonymousLambdaArrayTypeConversionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Imports System
Imports System.Diagnostics

Public Class TargetTypeTestClass

    Private Shared Sub Main()
        Dim actions As Action() = {Sub() Debug.Print(1), Sub() Debug.Print(2)}
        Dim objects = New List(Of Object) From {Sub() Debug.Print(3), Sub() Debug.Print(4)}
    End Sub
End Class", @"using System;
using System.Collections.Generic;
using System.Diagnostics;

public partial class TargetTypeTestClass
{

    private static void Main()
    {
        Action[] actions = new[] { new Action(() => Debug.Print(1.ToString())), new Action(() => Debug.Print(2.ToString())) };
        var objects = new List<object>() { new Action(() => Debug.Print(3.ToString())), new Action(() => Debug.Print(4.ToString())) };
    }
}");
    }

    [Fact]
    public async Task AnonymousLambdaTypeConversionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class AnonymousLambdaTypeConversionTest
    Public Sub CallThing(thingToCall As [Delegate])
    End Sub

    Public Sub SomeMethod()
    End Sub

    Public Sub Foo()
        CallThing(Sub()
                    SomeMethod()
                  End Sub)
        CallThing(Sub(a) SomeMethod())
        CallThing(Function()
                    SomeMethod()
                    Return False
                  End Function)
        CallThing(Function(a) False)
    End Sub
End Class", @"using System;

public partial class AnonymousLambdaTypeConversionTest
{
    public void CallThing(Delegate thingToCall)
    {
    }

    public void SomeMethod()
    {
    }

    public void Foo()
    {
        CallThing(new Action(() => SomeMethod()));
        CallThing(new Action<object>(a => SomeMethod()));
        CallThing(new Func<bool>(() =>
        {
            SomeMethod();
            return false;
        }));
        CallThing(new Func<object, bool>(a => false));
    }
}");
    }

    [Fact]
    public async Task AwaitAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Private Function SomeAsyncMethod() As Task(Of Integer)
        Return Task.FromResult(0)
    End Function

    Private Async Sub TestMethod()
        Dim result As Integer = Await SomeAsyncMethod()
        Console.WriteLine(result)
    End Sub
End Class", @"using System;
using System.Threading.Tasks;

internal partial class TestClass
{
    private Task<int> SomeAsyncMethod()
    {
        return Task.FromResult(0);
    }

    private async void TestMethod()
    {
        int result = await SomeAsyncMethod();
        Console.WriteLine(result);
    }
}");
    }

    [Fact]
    public async Task NameQualifyingHandlesInheritanceAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClassBase
    Sub DoStuff()
    End Sub
End Class
Class TestClass
    Inherits TestClassBase
    Private Sub TestMethod()
        DoStuff()
    End Sub
End Class", @"
internal partial class TestClassBase
{
    public void DoStuff()
    {
    }
}
internal partial class TestClass : TestClassBase
{
    private void TestMethod()
    {
        DoStuff();
    }
}");
    }

    [Fact]
    public async Task UsingGlobalImportAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Class TestClass
    Public Function TestMethod() As String
         Return vbCrLf
    End Function
End Class", @"using Microsoft.VisualBasic; // Install-Package Microsoft.VisualBasic

internal partial class TestClass
{
    public string TestMethod()
    {
        return Constants.vbCrLf;
    }
}");
    }

    [Fact]
    public async Task ValueCapitalisationAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"public Enum TestState
one
two
end enum
public class test
private _state as TestState
    Public Property State As TestState
        Get
            Return _state
        End Get
        Set
            If Not _state.Equals(Value) Then
                _state = Value
            End If
        End Set
    End Property
end class", @"
public enum TestState
{
    one,
    two
}

public partial class test
{
    private TestState _state;
    public TestState State
    {
        get
        {
            return _state;
        }
        set
        {
            if (!_state.Equals(value))
            {
                _state = value;
            }
        }
    }
}");
    }

    [Fact]
    public async Task ConstLiteralConversionIssue329Async()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Module Module1
    Const a As Boolean = 1
    Const b As Char = ChrW(1)
    Const c As Single = 1
    Const d As Double = 1
    Const e As Decimal = 1
    Const f As SByte = 1
    Const g As Short = 1
    Const h As Integer = 1
    Const i As Long = 1
    Const j As Byte = 1
    Const k As UInteger = 1
    Const l As UShort = 1
    Const m As ULong = 1
    Const Nl As String = ChrW(13) + ChrW(10)

    Sub Main()
        Const x As SByte = 4
    End Sub
End Module", @"
internal static partial class Module1
{
    private const bool a = true;
    private const char b = '\u0001';
    private const float c = 1f;
    private const double d = 1d;
    private const decimal e = 1m;
    private const sbyte f = 1;
    private const short g = 1;
    private const int h = 1;
    private const long i = 1L;
    private const byte j = 1;
    private const uint k = 1U;
    private const ushort l = 1;
    private const ulong m = 1UL;
    private const string Nl = ""\r\n"";

    public static void Main()
    {
        const sbyte x = 4;
    }
}
");
    }

    [Fact]
    public async Task SelectCaseIssue361Async()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Module Module1
    Enum E
        A = 1
    End Enum

    Sub Main()
        Dim x = 1
        Select Case x
            Case E.A
                Console.WriteLine(""z"")
        End Select
    End Sub
End Module", @"using System;

internal static partial class Module1
{
    public enum E
    {
        A = 1
    }

    public static void Main()
    {
        int x = 1;
        switch (x)
        {
            case (int)E.A:
                {
                    Console.WriteLine(""z"");
                    break;
                }
        }
    }
}");
    }

    [Fact]
    public async Task SelectCaseIssue675Async()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Public Class EnumTest
    Public Enum UserInterface
        Unknown
        Spectrum
        Wisdom
    End Enum

    Public Sub OnLoad(ui As UserInterface?)
        Dim activity = 0
            Select Case ui
                Case ui Is Nothing
                    activity = 1
                Case UserInterface.Spectrum
                    activity = 2
                Case UserInterface.Wisdom
                    activity = 3
                Case Else
                    activity = 4
            End Select
    End Sub
End Class", @"
public partial class EnumTest
{
    public enum UserInterface
    {
        Unknown,
        Spectrum,
        Wisdom
    }

    public void OnLoad(UserInterface? ui)
    {
        int activity = 0;
        switch (ui)
        {
            case object _ when ui is null:
                {
                    activity = 1;
                    break;
                }
            case UserInterface.Spectrum:
                {
                    activity = 2;
                    break;
                }
            case UserInterface.Wisdom:
                {
                    activity = 3;
                    break;
                }

            default:
                {
                    activity = 4;
                    break;
                }
        }
    }
}");
    }

    [Fact]
    public async Task SelectCaseDoesntGenerateBreakWhenLastStatementWillExitAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Public Class Test
    Public Function OnLoad() As Integer
        Dim x = 5
        While True
            Select Case x
                Case 0
                    Continue While
                Case 1
                    x = 1
                Case 2
                    Return 2
                Case 3
                    Throw New Exception()
                Case 4
                    If True Then
                        x = 4
                    Else
                        Return x
                    End If
                Case 5
                    If True Then
                        Return x
                    Else
                        x = 5
                    End If
                Case 6
                    If True Then
                        Return x
                    Else If False Then
                        x = 6
                    Else
                        Return x
                    End If
                Case 7
                    If True Then
                        Return x
                    End If
                Case 8
                    If True Then Return x
                Case 9
                    If True Then x = 9
                Case 10
                    If True Then Return x Else x = 10
                Case 11
                    If True Then x = 11 Else Return x
                Case 12
                    If True Then Return x Else Return x
                Case 13
                    If True Then
                        Return x
                    Else If False Then
                        Continue While
                    Else If False Then
                        Throw New Exception()
                    Else If False Then
                        Exit Select
                    Else
                        Return x
                    End If
                Case 14
                    If True Then
                        Return x
                    Else If False Then
                        Return x
                    Else If False Then
                        Exit Select
                    End If
                Case Else
                    If True Then
                        Return x
                    Else
                        Return x
                    End If
            End Select
        End While
        Return x
    End Function
End Class", @"using System;

public partial class Test
{
    public int OnLoad()
    {
        int x = 5;
        while (true)
        {
            switch (x)
            {
                case 0:
                    {
                        continue;
                    }
                case 1:
                    {
                        x = 1;
                        break;
                    }
                case 2:
                    {
                        return 2;
                    }
                case 3:
                    {
                        throw new Exception();
                    }
                case 4:
                    {
                        if (true)
                        {
                            x = 4;
                        }
                        else
                        {
                            return x;
                        }

                        break;
                    }
                case 5:
                    {
                        if (true)
                        {
                            return x;
                        }
                        else
                        {
                            x = 5;
                        }

                        break;
                    }
                case 6:
                    {
                        if (true)
                        {
                            return x;
                        }
                        else if (false)
                        {
                            x = 6;
                        }
                        else
                        {
                            return x;
                        }

                        break;
                    }
                case 7:
                    {
                        if (true)
                        {
                            return x;
                        }

                        break;
                    }
                case 8:
                    {
                        if (true)
                            return x;
                        break;
                    }
                case 9:
                    {
                        if (true)
                            x = 9;
                        break;
                    }
                case 10:
                    {
                        if (true)
                            return x;
                        else
                            x = 10;
                        break;
                    }
                case 11:
                    {
                        if (true)
                            x = 11;
                        else
                            return x;
                        break;
                    }
                case 12:
                    {
                        if (true)
                            return x;
                        else
                            return x;
                    }
                case 13:
                    {
                        if (true)
                        {
                            return x;
                        }
                        else if (false)
                        {
                            continue;
                        }
                        else if (false)
                        {
                            throw new Exception();
                        }
                        else if (false)
                        {
                            break;
                        }
                        else
                        {
                            return x;
                        }
                    }
                case 14:
                    {
                        if (true)
                        {
                            return x;
                        }
                        else if (false)
                        {
                            return x;
                        }
                        else if (false)
                        {
                            break;
                        }

                        break;
                    }

                default:
                    {
                        if (true)
                        {
                            return x;
                        }
                        else
                        {
                            return x;
                        }
                    }
            }
        }
        return x;
    }
}");
    }

    [Fact]
    public async Task SelectCaseObjectCaseIntegerAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Public Class SelectObjectCaseIntegerTest
    Sub S()
        Dim o As Object
        Dim j As Integer
        o = 2.0
        Select Case o
            Case 1
                j = 1
            Case 2
                j = 2
            Case 3 To 4
                j = 3
            Case > 4
                j = 4
            Case Else
                j = -1
        End Select
    End Sub
End Class", @"using Microsoft.VisualBasic.CompilerServices; // Install-Package Microsoft.VisualBasic

public partial class SelectObjectCaseIntegerTest
{
    public void S()
    {
        object o;
        int j;
        o = 2.0d;
        switch (o)
        {
            case var @case when Operators.ConditionalCompareObjectEqual(@case, 1, false):
                {
                    j = 1;
                    break;
                }
            case var case1 when Operators.ConditionalCompareObjectEqual(case1, 2, false):
                {
                    j = 2;
                    break;
                }
            case var case2 when Operators.ConditionalCompareObjectLessEqual(3, case2, false) && Operators.ConditionalCompareObjectLessEqual(case2, 4, false):
                {
                    j = 3;
                    break;
                }
            case var case3 when Operators.ConditionalCompareObjectGreater(case3, 4, false):
                {
                    j = 4;
                    break;
                }

            default:
                {
                    j = -1;
                    break;
                }
        }
    }
}
1 target compilation errors:
CS0825: The contextual keyword 'var' may only appear within a local variable declaration or in script code");
        //BUG: Correct textual output, but requires var pattern syntax construct not available before CodeAnalysis 3
    }

    [Fact]
    public async Task TupleAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Public Function GetString(yourBoolean as Boolean) As Boolean
    Return 1 <> 1 OrElse if (yourBoolean, True, False)
End Function",
            @"public bool GetString(bool yourBoolean)
{
    return 1 != 1 || (yourBoolean ? true : false);
}");
    }

    [Fact]
    public async Task UseEventBackingFieldAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Public Class Foo
    Public Event Bar As EventHandler(Of EventArgs)

    Protected Sub OnBar(e As EventArgs)
        If BarEvent Is Nothing Then
            System.Diagnostics.Debug.WriteLine(""No subscriber"")
        Else
            RaiseEvent Bar(Me, e)
        End If
    End Sub
End Class",
            @"using System;
using System.Diagnostics;

public partial class Foo
{
    public event EventHandler<EventArgs> Bar;

    protected void OnBar(EventArgs e)
    {
        if (Bar is null)
        {
            Debug.WriteLine(""No subscriber"");
        }
        else
        {
            Bar?.Invoke(this, e);
        }
    }
}");
    }

    [Fact]
    public async Task DateTimeToDateAndTimeAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class Class1
    Sub Foo()
        Dim x = DateAdd(""m"", 5, Now)
    End Sub
End Class", @"using System;
using Microsoft.VisualBasic; // Install-Package Microsoft.VisualBasic

public partial class Class1
{
    public void Foo()
    {
        var x = DateAndTime.DateAdd(""m"", 5d, DateTime.Now);
    }
}");
    }

    [Fact]
    public async Task BaseFinalizeRemovedAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class Class1
    Protected Overrides Sub Finalize()
        MyBase.Finalize()
    End Sub
End Class", @"
public partial class Class1
{
    ~Class1()
    {
    }
}");
    }

    [Fact]
    public async Task GlobalNameIssue375Async()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Module Module1
    Sub Main()
        Dim x = Microsoft.VisualBasic.Timer
    End Sub
End Module", @"using Microsoft.VisualBasic; // Install-Package Microsoft.VisualBasic

internal static partial class Module1
{
    public static void Main()
    {
        double x = DateAndTime.Timer;
    }
}");
    }

    [Fact]
    public async Task TernaryConversionIssue363Async()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Module Module1
    Sub Main()
        Dim x As Short = If(True, CShort(50), 100S)
    End Sub
End Module", @"
internal static partial class Module1
{
    public static void Main()
    {
        short x = true ? (short)50 : (short)100;
    }
}
");
    }

    [Fact]
    public async Task GenericMethodCalledWithAnonymousTypeAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Public Class MoreParsing
    Sub DoGet()
        Dim anon = New With {
            .ANumber = 5
        }
        Dim sameAnon = Identity(anon)
        Dim repeated = Enumerable.Repeat(anon, 5).ToList()
    End Sub

    Private Function Identity(Of TType)(tInstance As TType) As TType
        Return tInstance
    End Function
End Class",
            @"using System.Linq;

public partial class MoreParsing
{
    public void DoGet()
    {
        var anon = new { ANumber = 5 };
        var sameAnon = Identity(anon);
        var repeated = Enumerable.Repeat(anon, 5).ToList();
    }

    private TType Identity<TType>(TType tInstance)
    {
        return tInstance;
    }
}");
    }

    [Fact]
    public async Task DecimalToIntegerCompoundOperatorsWithTypeConversionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Public Class Compound
    Public Sub Operators()
        Dim anInt As Integer = 123
        Dim aDec As Decimal = 12.3
        anInt *= aDec
        anInt \= aDec
        anInt /= aDec
        anInt -= aDec
        anInt += aDec
    End Sub
End Class",
            @"using System;

public partial class Compound
{
    public void Operators()
    {
        int anInt = 123;
        decimal aDec = 12.3m;
        anInt = (int)Math.Round(anInt * aDec);
        anInt = (int)(anInt / (long)Math.Round(aDec));
        anInt = (int)Math.Round(anInt / aDec);
        anInt = (int)Math.Round(anInt - aDec);
        anInt = (int)Math.Round(anInt + aDec);
    }
}");
    }

    [Fact]
    public async Task DecimalToShortCompoundOperatorsWithTypeConversionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Public Class Compound
    Public Sub Operators()
        Dim aShort As Short = 123
        Dim aDec As Decimal = 12.3
        aShort *= aDec
        aShort \= aDec
        aShort /= aDec
        aShort -= aDec
        aShort += aDec
    End Sub
End Class",
            @"using System;

public partial class Compound
{
    public void Operators()
    {
        short aShort = 123;
        decimal aDec = 12.3m;
        aShort = (short)Math.Round(aShort * aDec);
        aShort = (short)(aShort / (long)Math.Round(aDec));
        aShort = (short)Math.Round(aShort / aDec);
        aShort = (short)Math.Round(aShort - aDec);
        aShort = (short)Math.Round(aShort + aDec);
    }
}");
    }

    [Fact]
    public async Task IntegerToShortCompoundOperatorsWithTypeConversionAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Public Class Compound
    Public Sub Operators()
        Dim aShort As Short = 123
        Dim anInt As Integer= 12
        aShort *= anInt
        aShort \= anInt
        aShort /= anInt
        aShort -= anInt
        aShort += anInt
    End Sub
End Class",
            @"using System;

public partial class Compound
{
    public void Operators()
    {
        short aShort = 123;
        int anInt = 12;
        aShort = (short)(aShort * anInt);
        aShort = (short)(aShort / anInt);
        aShort = (short)Math.Round(aShort / (double)anInt);
        aShort = (short)(aShort - anInt);
        aShort = (short)(aShort + anInt);
    }
}");
    }

    [Fact]
    public async Task ShortMultiplicationDeclarationAndAssignmentAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Public Class Compound
    Public Sub Operators()
        Dim aShort As Short = 123
        Dim anotherShort As Short = 234
        Dim x As Short = aShort * anotherShort
        x *= aShort ' Implicit cast in C# due to compound operator
        x = aShort * x
    End Sub
End Class",
            @"
public partial class Compound
{
    public void Operators()
    {
        short aShort = 123;
        short anotherShort = 234;
        short x = (short)(aShort * anotherShort);
        x *= aShort; // Implicit cast in C# due to compound operator
        x = (short)(aShort * x);
    }
}");
    }

    [Fact]
    public async Task SquareBracketsInLabelAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"
Sub S()
    GoTo [finally]
[finally]:
    GoTo [Step]
[Step]:
End Sub",
            @"
public void S()
{
    goto @finally;
@finally:
    ;

    goto Step;
Step:
    ;

}");
    }

    [Fact]
    public async Task SquareBracketsInIdentifierAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"
    Sub [Step]()
        Static i As Integer
    End Sub",
            @"
internal partial class SurroundingClass
{
    private int _Step_i;

    public void Step()
    {
    }
}");
    }

    [Fact]
    public async Task CintIsConvertedCorrectlyAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Public Class Compound
    Public Sub Operators()
        Dim do_Tmp As Double = 9999 / 100
        Dim i_Tmp as Integer = CInt(do_Tmp)
    End Sub
End Class",
            @"using System;

public partial class Compound
{
    public void Operators()
    {
        double do_Tmp = 9999d / 100d;
        int i_Tmp = (int)Math.Round(do_Tmp);
    }
}");
    }

    [Fact]
    public async Task ArgumentsAreTypeConvertedAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(
            @"Imports System.Drawing

Public Class Compound
    Public Sub TypeCast(someInt As Integer)
        Dim col = Color.FromArgb(someInt * 255.0F, someInt * 255.0F, someInt * 255.0F)
        Dim arry = New Single(7/someInt) {}
    End Sub
End Class",
            @"using System;
using System.Drawing;

public partial class Compound
{
    public void TypeCast(int someInt)
    {
        var col = Color.FromArgb((int)Math.Round(someInt * 255.0f), (int)Math.Round(someInt * 255.0f), (int)Math.Round(someInt * 255.0f));
        float[] arry = new float[(int)Math.Round(7d / someInt + 1)];
    }
}");
    }

    [Fact]
    public async Task NullCoalescingOperatorUsesParenthesisWhenNeededAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Class VisualBasicClass
    Public Sub TestMethod(ByVal x As String, ByVal y As Func(Of Integer))
        Dim a As String = If(x, ""x"")
        Dim b As String = If(x, ""x"").ToUpper()
        Dim c As String = $""{If(x, ""x"")}""
        Dim d As String = $""{If(x, ""x"").ToUpper()}""
        Dim e =  If(y, Function() 5)
        Dim f =  If(y, (Function() 6))
    End Sub
End Class", @"using System;

public partial class VisualBasicClass
{
    public void TestMethod(string x, Func<int> y)
    {
        string a = x ?? ""x"";
        string b = (x ?? ""x"").ToUpper();
        string c = $""{x ?? ""x""}"";
        string d = $""{(x ?? ""x"").ToUpper()}"";
        var e = y ?? (() => 5);
        var f = y ?? (() => 6);
    }
}");
    }

    [Fact]
    public async Task NullForgivingInvocationDoesNotThrowAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Imports System

Public Class AClass
        Public Shared Sub Identify(ByVal talker As ITraceMessageTalker)
            talker?.IdentifyTalker(IdentityTraceMessage())
        End Sub

    Private Shared Function IdentityTraceMessage() As Object
        Throw New NotImplementedException()
    End Function
End Class

Public Interface ITraceMessageTalker
    Function IdentifyTalker(v As Object) As Object
End Interface", @"using System;

public partial class AClass
{
    public static void Identify(ITraceMessageTalker talker)
    {
        talker?.IdentifyTalker(IdentityTraceMessage());
    }

    private static object IdentityTraceMessage()
    {
        throw new NotImplementedException();
    }
}

public partial interface ITraceMessageTalker
{
    object IdentifyTalker(object v);
}");
    }

    [Fact]
    public async Task NegatedNullableBoolAsync()
    {
        await TestConversionVisualBasicToCSharpAsync(@"Public Enum CrashEnum
    None = 0
    One = 1
    Two = 2
End Enum
Public Class CrashClass
    Public Property CrashEnum As CrashEnum?
    Public Property IsSet As Boolean
End Class
Public Class CrashTest
    Public Function Edit(Optional flag2 As Boolean = False, Optional crashEnum As CrashEnum? = Nothing) As Object
        Dim CrashClass As CrashClass = Nothing
        Dim Flag0 As Boolean = True
        Dim Flag1 As Boolean = True
        If Flag0 Then
            If Flag1 AndAlso flag2 Then
                If crashEnum.GetValueOrDefault() > 0 AndAlso (Not CrashClass.CrashEnum.HasValue OrElse crashEnum <> CrashClass.CrashEnum) Then
                    CrashClass.CrashEnum = crashEnum
                    CrashClass.IsSet = True
                End If
            End If
        End If
        Return Nothing
    End Function
End Class", @"
public enum CrashEnum
{
    None = 0,
    One = 1,
    Two = 2
}

public partial class CrashClass
{
    public CrashEnum? CrashEnum { get; set; }
    public bool IsSet { get; set; }
}

public partial class CrashTest
{
    public object Edit(bool flag2 = false, CrashEnum? crashEnum = default)
    {
        CrashClass CrashClass = null;
        bool Flag0 = true;
        bool Flag1 = true;
        if (Flag0)
        {
            if (Flag1 && flag2)
            {
                if ((int)crashEnum.GetValueOrDefault() > 0 && (!CrashClass.CrashEnum.HasValue ? true : CrashClass.CrashEnum is var arg1 && crashEnum.HasValue && arg1.HasValue ? crashEnum.Value != arg1.Value : (bool?)null).GetValueOrDefault())
                {
                    CrashClass.CrashEnum = crashEnum;
                    CrashClass.IsSet = true;
                }
            }
        }
        return null;
    }
}");
    }
    [Fact]
    public async Task LambdaBodyExpressionWithCommentsAsync() {
        await TestConversionVisualBasicToCSharpAsync(@"
Imports System.Threading.Tasks
Imports System.Collections.Generic

Public Class ConversionTest1
    Public Sub BugRepro()
        Dim dt As New List(Of Integer)

        Parallel.ForEach(dt, Sub(row)
                                 If Not String.IsNullOrWhiteSpace("""") Then
                                     'comment1
                                     Dim test1 As Boolean = True
                                     'comment2
                                     Dim test2 As Boolean = True
                                     'comment3
                                     Dim test3 As Boolean = True
                                 End If
                             End Sub)
    End Sub
End Class
", @"using System.Collections.Generic;
using System.Threading.Tasks;

public partial class ConversionTest1
{
    public void BugRepro()
    {
        var dt = new List<int>();

        Parallel.ForEach(dt, row =>
        {
            if (!string.IsNullOrWhiteSpace(""""))
            {
                // comment1
                bool test1 = true;
                // comment2
                bool test2 = true;
                // comment3
                bool test3 = true;
            }
        });
    }
}", incompatibleWithAutomatedCommentTesting: true);
    }
}