Interaction-based testing

To ensure decoupling, this should only be done when testing external dependencies

[TextFixture]
public class TestClass
{
	[SetUp]
	public void SetUp()
	{
		var classToMock = new Mock<IFileReader>();
		var service = new Service(classToMock.Object);
	}

	[Test]
	public void MethodName_SenarioName_ExpectedBehaviour()
	{
		// Arrange

		// Act
		var result = service.DoWork();
		
		// Assert
		// Verifys if the method is called with specified arguments
		classToMock.Verify(c => c.MethodToVerify("expected args"));
	}
}