added unit tests for core module WidgetInstanceService (#1077)

Co-authored-by: Hisham Bin Ateya <hishamco_2007@yahoo.com>

Author: Arunkumar0610

test/SimplCommerce.Module.Core.Tests/Services/WidgetInstanceServiceTests.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Linq;
+using Moq;
+using SimplCommerce.Infrastructure.Data;
+using SimplCommerce.Module.Core.Models;
+using SimplCommerce.Module.Core.Services;
+using Xunit;
+
+namespace SimplCommerce.Module.Core.Tests.Services
+{
+    public class WidgetInstanceServiceTests
+    {
+        [Fact]
+        public void GetPublished_ShouldReturnPublishedWidgetInstances()
+        {
+            // Arrange
+            var widgetInstances = new[]
+            {
+                new WidgetInstance { PublishStart = DateTimeOffset.Now.AddDays(-1), PublishEnd = DateTimeOffset.Now.AddDays(1) },
+                new WidgetInstance { PublishStart = DateTimeOffset.Now.AddDays(-2), PublishEnd = DateTimeOffset.Now.AddDays(2) }
+            };
+
+            var mockRepository = new Mock<IRepository<WidgetInstance>>();
+            mockRepository.Setup(x => x.Query()).Returns(widgetInstances.AsQueryable());
+
+            var widgetInstanceService = new WidgetInstanceService(mockRepository.Object);
+
+            // Act
+            var result = widgetInstanceService.GetPublished();
+
+            // Assert
+            Assert.Equal(widgetInstances.Length, result.Count());
+        }
+
+        [Fact]
+        public void GetPublished_ShouldNotReturnUnpublishedWidgetInstances()
+        {
+            // Arrange
+            var widgetInstances = new[]
+            {
+                new WidgetInstance { PublishStart = DateTimeOffset.Now.AddDays(1), PublishEnd = DateTimeOffset.Now.AddDays(2) },
+                new WidgetInstance { PublishStart = null, PublishEnd = DateTimeOffset.Now.AddDays(-1) },
+            };
+
+            var mockRepository = new Mock<IRepository<WidgetInstance>>();
+            mockRepository.Setup(x => x.Query()).Returns(widgetInstances.AsQueryable());
+
+            var widgetInstanceService = new WidgetInstanceService(mockRepository.Object);
+
+            // Act
+            var result = widgetInstanceService.GetPublished();
+
+            // Assert
+            Assert.Empty(result);
+        }
+    }
+}