Non-void Methods

String

[TextFixture]
public class TestClass
{
	[Test]
	public void MethodName_SenarioName_ExpectedBehaviour()
	{
		// Arrange
		
		// Act
		var result = AddStrong.AddStrong("abc");
		
		// Assert
		Assert.That(result, Is.EqualTo("<strong>abc</strong>"));
		
		// or, for a more general asserts
		// best used for non critical cases like exception messages
		Assert.That(result, Does.StartWith("<strong>"));
		Assert.That(result, Does.Contain("abc"));
		Assert.That(result, Does.EndsWith("</strong>"));
	}
}

Arrays

[TextFixture]
public class TestClass
{
	[Test]
	public void MethodName_SenarioName_ExpectedBehaviour()
	{
		// Arrange
		
		// Act
		var OddNums = C.OddNumbers(5); // setting our limit to 5
		
		// Assert
		Assert.That(result, Is.Not.Empty);
		
		Assert.That(result.count, Is.EqualTo(3));
		
		Assert.That(result, Does.Contain(1));
		Assert.That(result, Does.Contain(3));
		Assert.That(result, Does.Contain(5));
		
		Assert.That(result, Is.EquivalentTo(new [] {1, 3, 5});
		
		Assert.That(result, Is.Ordered);
		Assert.That(result, Is.Unique);
	}
}

Handling Types (ASP.Net)

[TextFixture]
public class TestClass
{
	[Test]
	public void MethodName_SenarioName_ExpectedBehaviour()
	{
		// We are gonna test a controller that returns an IActionResult
		// Thus it can return OK or NotFound
	
		// Arrange
		var controller = new ControllerName();
		
		// Act
		var result = controller.GetCustomer(0);
		
		// Assert
		Assert.That(result, Is.TypeOf<NotFound>());
		
		Assert.That(result, Is.InstanceOf<NotFound>()); // can be a child of not found
	}
}