Adding assig4

4/ClassLibraryProjects/StringLibraryTests/MSTestSettings.cs

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+[assembly: Parallelize(Scope = ExecutionScope.MethodLevel)]

4/ClassLibraryProjects/StringLibraryTests/StringLibraryTests.cs

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+using UtilityLibraries;
+
+namespace StringLibraryTests;
+
+[TestClass]
+public sealed class StringLibraryTests
+{
+    [TestMethod]
+    public void TestStartsWithUpper()
+    {
+        string[] words = ["Alphabet", "Zebra", "ABC", "Something", "Nothing"];
+
+        foreach (string word in words)
+        {
+            bool result = word.StartsWithUpper();
+            Assert.IsTrue(result, $"Expected for '{word}': true; Actual: {result}");
+        }
+    }
+
+    [TestMethod]
+    public void TestDoesNotStartWithUpper()
+    {
+        string[] words = ["alphabet", "zebra", "abc", "nothing", "something", "1234", ".", ";", " "];
+
+        foreach (string word in words)
+        {
+            bool result = word.StartsWithUpper();
+            Assert.IsFalse(result, $"Expected for '{word}': false; Actual: {result}");
+        }
+    }
+
+    [TestMethod]
+    public void DirectCallWithNullOrEmpty()
+    {
+        string?[] words = [string.Empty, null];
+
+        foreach (string? word in words)
+        {
+            bool result = StringLibrary.StartsWithUpper(word);
+            Assert.IsFalse(result, $"Expected for '{word ?? "<null>"}': false; Actual: {result}");
+        }
+    }
+}

4/ClassLibraryProjects/StringLibraryTests/StringLibraryTests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="MSTest" Version="3.6.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Microsoft.VisualStudio.TestTools.UnitTesting" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\StringLibrary\StringLibrary.csproj" />
+  </ItemGroup>
+
+</Project>