Hello World sample: new test to instance basic methods

Author: Gonzalo Diaz

algorithm-exercises-csharp/src/Hello.Test.cs

@@ -3,6 +3,30 @@ namespace algorithm_exercises_csharp;
 [TestClass]
 public class HelloWorldTest
 {
+  [TestMethod]
+  public void TestInstance()
+  {
+    HelloWorld a = HelloWorld.Create();
+    HelloWorld b = HelloWorld.Create();
+
+    Type knownType = typeof(HelloWorld);
+    Type resultType = a.GetType();
+    Assert.IsInstanceOfType(a, knownType);
+    Assert.IsInstanceOfType(a, resultType);
+
+    int resultHashCode = a.GetHashCode();
+    Assert.IsNotNull(resultHashCode);
+
+    bool expectedEquals = true;
+    bool expectedNotEquals = false;
+    Assert.AreEqual(expectedEquals, a.Equals(a));
+    Assert.AreEqual(expectedNotEquals, a.Equals(b));
+
+    string expectedString = "algorithm_exercises_csharp.HelloWorld";
+    string? resultString = a.ToString();
+    Assert.AreEqual<string>(expectedString, resultString);
+  }
+
   [TestMethod]
   public void TestHello()
   {

algorithm-exercises-csharp/src/Hello.cs

@@ -11,4 +11,8 @@ public static string Hello()
   {
     return "Hello World!";
   }
+
+  public static HelloWorld Create() {
+    return new HelloWorld();
+  }
 }