FluentAssertions. Assert multiple exceptions.

HowCanIUseItProperly.cs

        // I would like to make sure, both exceptions are packed into the AggregateException
        [TestMethod]
        public void ShouldThrowAggregateException()
        {
            Action act = () =>
                {
                    throw new AggregateException(new Exception(), new ArgumentException());
                };

            act.ShouldThrow<AggregateException>()
                .WithInnerExceptionExactly<Exception>()
                .WithInnerExceptionExactly<ArgumentException>();
        }

MaybeABug.cs

        // I would expect this test to pass
        [TestMethod]
        public void ShouldThrowAggregateException()
        {
            Action act = () =>
                {
                    throw new AggregateException(new Exception(), new ArgumentException());
                };

            act.ShouldThrow<AggregateException>()
                .WithInnerExceptionExactly<ArgumentException>();
        }