CSHARP

fluentassertions force exceptions

subject.Invoking(y => y.Foo("Hello"))
    .Should().Throw<InvalidOperationException>()
    .WithMessage("Hello is not allowed at this moment");

fluentassertions force exceptions

[Test]
public void GreaterThan_NullAsRhs_ThrowsException()
{
    var lhs = new ClassWithOverriddenOperator();
    var rhs = (ClassWithOverriddenOperator) null;

    Action comparison = () => { var res = lhs > rhs; };

    comparison.Should().Throw<Exception>();
}