I apologize. It seems the problem was coming from the empty-string test showing a fail while I was still working on my solution and I got confused, thinking the previous test giving incorrect output.

Although, it might be a good idea to move the empty string test out of the random tests, into its individual test case, to avoid confusion? Also add it to the KATA's description that the expectation for an empty input is "true".

Sometimes the random tests are straight up incorrect in C#.
E.g. expecting "(" to return true. I had to ran the Kata with my solution a few times until it finally passed.

The assertions in the C# Random tests are also written incorrectly, mixing up the Expected and Actual. Please put the expected value as the first parameter of Assert.AreEqual. We regularly saw "Actual" not being what we Console logged as "our answer :".