Configurazione di xUnit/MSTest, asserzioni

using System;

public static class MathUtil
{
  // Method under test
  public static int Add(int a, int b)
  {
    return a + b;
  }
}

public class Program
{
  public static void Main(string[] args)
  {
    // Arrange
    int a = 2;
    int b = 3;
    int expected = 5;

    // Act
    int actual = MathUtil.Add(a, b);

    // Assert (manual check for this console demo)
    if (actual == expected)
      Console.WriteLine("PASS: Add returned " + actual);
    else
      Console.WriteLine("FAIL: expected " + expected + " but got " + actual);
  }
}

using System;

public static class Assert
{
  public static void AreEqual(int expected, int actual)
  {
    if (expected != actual)
      throw new Exception("AreEqual failed: expected " + expected + ", actual " + actual);
  }

  public static void IsTrue(bool condition, string message)
  {
    if (!condition) throw new Exception("IsTrue failed: " + message);
  }
}

public static class MathUtil
{
  public static int Mul(int a, int b) { return a * b; }
}

public class Program
{
  public static void Main(string[] args)
  {
    try
    {
      int r = MathUtil.Mul(2, 4);
      Assert.AreEqual(8, r);                 // pass
      Assert.IsTrue(r % 2 == 0, "even");     // pass
      Console.WriteLine("All assertions passed.");
    }
    catch (Exception ex)
    {
      Console.WriteLine("TEST FAILED: " + ex.Message);
    }
  }
}

using System;

public static class StringUtil
{
  public static string Repeat(string s, int n)
  {
    if (n < 0) throw new ArgumentOutOfRangeException("n");
    string r = "";
    for (int i = 0; i < n; i++) r += s;
    return r;
  }
}

public static class Assert
{
  public static void AreEqual(string expected, string actual)
  {
    if (expected != actual)
      throw new Exception("AreEqual failed: expected [" + expected + "], actual [" + actual + "]");
  }
}

public class Program
{
  static void TestRepeat_Happy()
  {
    string got = StringUtil.Repeat("ab", 3);
    Assert.AreEqual("ababab", got); // pass
  }

  static void TestRepeat_EmptyTimesZero()
  {
    string got = StringUtil.Repeat("x", 0);
    Assert.AreEqual("", got); // pass
  }

  public static void Main(string[] args)
  {
    try { TestRepeat_Happy(); Console.WriteLine("PASS: Happy"); } catch (Exception ex) { Console.WriteLine("FAIL: Happy -> " + ex.Message); }
    try { TestRepeat_EmptyTimesZero(); Console.WriteLine("PASS: Zero"); } catch (Exception ex) { Console.WriteLine("FAIL: Zero -> " + ex.Message); }
  }
}