[Test]
public void SomeOtherTest()
{
    //Arrange
    var mock = new Mock<IFoo>();
    var sut = new SystemUnderTest(mock.Object); //never liked doing it this way...
    mock.Setup(m => x.Bar()).Returns("A whole bunch of ceremonial syntax..");
    //Act
    sut.DoSomething();
    //Assert
    mock.Verify(m => m.Baz()); //Baaaaah, more laaaaambdas
}

[Test]
public void NSubTest()
{
    var mock = Substitute.For<IFoo>();
    var sut = new SystemUnderTest(mock); //much nicer!
    mock.Bar().Returns("Look ma! No lambdas!");

    sut.DoSomething();

    mock.Received().Baz();
}