TEST: Add new tests to verify coverage diff

Author: bart-vmware

src/Common/src/Common/Calculator.cs

@@ -0,0 +1,23 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information.
+
+namespace Steeltoe.Common;
+
+public sealed class Calculator
+{
+    public int Add(int left, int right)
+    {
+        if (left < 0 || right < 0)
+        {
+            throw new ArgumentException("Only non-negative integers are allowed.");
+        }
+
+        return left + right;
+    }
+
+    public int Subtract(int left, int right)
+    {
+        return left - right;
+    }
+}

src/Common/src/Common/PublicAPI.Unshipped.txt

@@ -1,4 +1,8 @@
 #nullable enable
+Steeltoe.Common.Calculator
+Steeltoe.Common.Calculator.Add(int left, int right) -> int
+Steeltoe.Common.Calculator.Calculator() -> void
+Steeltoe.Common.Calculator.Subtract(int left, int right) -> int
 Steeltoe.Common.Discovery.IServiceInstance.InstanceId.get -> string!
 Steeltoe.Common.Discovery.IServiceInstance.NonSecureUri.get -> System.Uri?
 Steeltoe.Common.Discovery.IServiceInstance.SecureUri.get -> System.Uri?

src/Common/test/Common.Test/CalculatorTest.cs

@@ -0,0 +1,22 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information.
+
+namespace Steeltoe.Common.Test;
+
+public sealed class CalculatorTest
+{
+    [Fact]
+    public void Add_Returns_Correct_Sum()
+    {
+        var calculator = new Calculator();
+        int result = calculator.Add(3, 5);
+        result.Should().Be(8);
+    }
+
+    [Fact(Skip = "ExampleSkippedTest")]
+    public void SkippedTest()
+    {
+        true.Should().BeFalse();
+    }
+}