SetupAllProperties.cs

[Fact]
public void TrackAllPropertiesWithSetupAllProperties()
{
    var mock = new Mock<IPropertyManager>();

    //mock.SetupProperty(m => m.FirstName);

    //Comment this and uncomment SetupProperty, the assertion fails
    mock.SetupAllProperties();

    mock.Object.FirstName = "Robert";
    mock.Object.LastName = "Paulson";

    mock.Object.FirstName.Should().Be("Robert");
    mock.Object.LastName.Should().Be("Paulson");
}