[REFACTOR] Hello World rewritten

Author: Gonzalo Diaz

src/algorithm_exercises_csharp/Hello.cs

@@ -4,12 +4,9 @@ namespace algorithm_exercises_csharp;
 
 public class HelloWorld
 {
-  const string __message = "Hello World!";
+  private readonly string __message = "Hello World!";
 
-  [ExcludeFromCodeCoverage]
-  protected HelloWorld() { }
-
-  public static string hello()
+  public string hello()
   {
     return __message;
   }

src/algorithm_exercises_csharp_test/Hello.BruteForce.Test.cs

@@ -9,7 +9,7 @@ public class HelloWorldBruteForceTest
   public void testInitialize()
   {
     var envValue = Environment.GetEnvironmentVariable("BRUTEFORCE");
-    envValue = envValue?.ToUpper();
+    envValue = envValue?.ToUpperInvariant();
     if (!allowedValues.Contains(envValue, StringComparer.OrdinalIgnoreCase))
     {
       Assert.Inconclusive($"Skipping BRUTEFORCE test because environment variable 'BRUTEFORCE' is not one of the expected values.");
@@ -20,7 +20,7 @@ public void testInitialize()
   public void testHelloBruteForce()
   {
     string expected = "Hello World!";
-    string result = HelloWorld.hello();
+    string result = HelloWorld.create().hello();
 
     Assert.AreEqual(expected, result);
   }

src/algorithm_exercises_csharp_test/Hello.Test.cs

@@ -34,7 +34,7 @@ public void testInstance()
   public void testHello()
   {
     string expected = "Hello World!";
-    string result = HelloWorld.hello();
+    string result = new HelloWorld().hello();
 
     Assert.AreEqual(expected, result);
   }