fluent assertions exception

                
                        // fluent syntax
subject.Invoking(y => y.Foo(null))
    .Should().Throw<ArgumentNullException>();

// arrange-act-assert syntax
Action callingFooWithNull = () => subject.Foo(null);

callingFooWithNull.Should().Throw<ArgumentNullException>()
    .WithParameterName("message");
                    
                

fluentassertions force exceptions

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

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