diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 64db9d16a..e01de4b52 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,9 +1,21 @@
-name: 'Run App <last name>, <first name>'
+name: 'Run App Kapaba, Defi'
 
 on: [push, pull_request]
 
 jobs:
   build-and-test:
     runs-on: ubuntu-latest
+
     steps:
-      - run: echo "Hello, World!"
+      - uses: actions/checkout@v2
+
+      - name: install dotnet
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '8.x'
+
+      - name: build
+        run: dotnet build
+
+      - name: run unit tests
+        run: dotnet test
\ No newline at end of file
diff --git a/Console/Program.cs b/Console/Program.cs
index 56bb86061..be4c11841 100644
--- a/Console/Program.cs
+++ b/Console/Program.cs
@@ -84,8 +84,12 @@ public static double Divide(string x, string y)
 	}
 
 	// Implement this method following a similar pattern as above
+	
 	public static double Power(string x, string y)
 	{
-		return 0.0;
+		if (x == null || y == null)
+			throw new ArgumentNullException();
+
+		return Math.Pow(Convert.ToDouble(x), Convert.ToDouble(y));
 	}
 }
diff --git a/README.md b/README.md
index 7400b87d5..5b703cd77 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,8 @@
-[![Run App](https://github.com/kgerot/GithubActions/actions/workflows/run-app.yaml/badge.svg)](https://github.com/kgerot/GithubActions/actions/workflows/run-app.yaml)
+[![Run App Kapaba, Defi](https://github.com/defimal/GithubActions/actions/workflows/ci.yml/badge.svg)](https://github.com/defimal/GithubActions/actions/workflows/ci.yml)
 
 # Do not submit a pull request to `kgerot/GithubActions` or `dteske/TraviCI`. Not following this instruction can ruin the lab for others, so pay attention.
 
+
 I receive around 60 pull requests every semester and have to manually delete each request and action run. Your actions will automatically fail if you open a pull request
 
 # Github Actions Lab
diff --git a/Tests/DivisionTests.cs b/Tests/DivisionTests.cs
new file mode 100644
index 000000000..eff4883cc
--- /dev/null
+++ b/Tests/DivisionTests.cs
@@ -0,0 +1,26 @@
+namespace GithubActionsLab;
+
+[TestClass]
+public class Division
+{
+    [TestMethod]
+    public void Divide_Valid_Kapaba()
+    {
+        Assert.AreEqual(2, Program.Divide("4", "2"));
+        Assert.AreEqual(3, Program.Divide("9", "3"));
+    }
+
+    [TestMethod]
+    public void Divide_Invalid_Kapaba()
+    {
+        Assert.ThrowsException<FormatException>(() => Program.Divide("a", "2"));
+        Assert.ThrowsException<FormatException>(() => Program.Divide("2", "b"));
+    }
+
+    [TestMethod]
+    public void Divide_Null_Kapaba()
+    {
+        Assert.ThrowsException<ArgumentNullException>(() => Program.Divide(null, "2"));
+        Assert.ThrowsException<ArgumentNullException>(() => Program.Divide("2", null));
+    }
+}
\ No newline at end of file
diff --git a/Tests/MultiplicationTests.cs b/Tests/MultiplicationTests.cs
new file mode 100644
index 000000000..257f0fcb5
--- /dev/null
+++ b/Tests/MultiplicationTests.cs
@@ -0,0 +1,27 @@
+namespace GithubActionsLab;
+
+[TestClass]
+public class Multiplication
+{
+    [TestMethod]
+    public void Multiply_Valid_Kapaba()
+    {
+        Assert.AreEqual(6, Program.Multiply("2", "3"));
+        Assert.AreEqual(0, Program.Multiply("0", "5"));
+        Assert.AreEqual(-6, Program.Multiply("-2", "3"));
+    }
+
+    [TestMethod]
+    public void Multiply_Invalid_Kapaba()
+    {
+        Assert.ThrowsException<FormatException>(() => Program.Multiply("a", "2"));
+        Assert.ThrowsException<FormatException>(() => Program.Multiply("2", "b"));
+    }
+
+    [TestMethod]
+    public void Multiply_Null_Kapaba()
+    {
+        Assert.ThrowsException<ArgumentNullException>(() => Program.Multiply(null, "2"));
+        Assert.ThrowsException<ArgumentNullException>(() => Program.Multiply("2", null));
+    }
+}
\ No newline at end of file
diff --git a/Tests/PowerTests.cs b/Tests/PowerTests.cs
new file mode 100644
index 000000000..98e439e9b
--- /dev/null
+++ b/Tests/PowerTests.cs
@@ -0,0 +1,27 @@
+namespace GithubActionsLab;
+
+[TestClass]
+public class PowerTests
+{
+    [TestMethod]
+    public void Power_Valid_Kapaba()
+    {
+        Assert.AreEqual(8, Program.Power("2", "3"));
+        Assert.AreEqual(1, Program.Power("5", "0"));
+        Assert.AreEqual(16, Program.Power("4", "2"));
+    }
+
+    [TestMethod]
+    public void Power_Invalid_Kapaba()
+    {
+        Assert.ThrowsException<FormatException>(() => Program.Power("a", "2"));
+        Assert.ThrowsException<FormatException>(() => Program.Power("2", "b"));
+    }
+
+    [TestMethod]
+    public void Power_Null_Kapaba()
+    {
+        Assert.ThrowsException<ArgumentNullException>(() => Program.Power(null, "2"));
+        Assert.ThrowsException<ArgumentNullException>(() => Program.Power("2", null));
+    }
+}
\ No newline at end of file
diff --git a/Tests/SubtractionTests.cs b/Tests/SubtractionTests.cs
new file mode 100644
index 000000000..fa703c4a1
--- /dev/null
+++ b/Tests/SubtractionTests.cs
@@ -0,0 +1,27 @@
+namespace GithubActionsLab;
+
+[TestClass]
+public class Subtraction
+{
+    [TestMethod]
+    public void Subtract_Valid_Kapaba()
+    {
+        Assert.AreEqual(1, Program.Subtract("3", "2"));
+        Assert.AreEqual(0, Program.Subtract("5", "5"));
+        Assert.AreEqual(-2, Program.Subtract("3", "5"));
+    }
+
+    [TestMethod]
+    public void Subtract_Invalid_Kapaba()
+    {
+        Assert.ThrowsException<FormatException>(() => Program.Subtract("1", "a"));
+        Assert.ThrowsException<FormatException>(() => Program.Subtract("a", "1"));
+    }
+
+    [TestMethod]
+    public void Subtract_Null_Kapaba()
+    {
+        Assert.ThrowsException<ArgumentNullException>(() => Program.Subtract(null, "1"));
+        Assert.ThrowsException<ArgumentNullException>(() => Program.Subtract("1", null));
+    }
+}
\ No newline at end of file