MutatingStringsBrainTeaser

To quote Randall Munroe

There's a certain type of brain that's easily disabled. If you show it an interesting problem, it involuntarily drops everything else to work on it

This is a simple brain teaser in C# that asks you to simply mutate a string. There are two unit tests that each make a couple assertions on a local string constant.

Rules

1. The only changes that may be made to Tests.cs should be within the CauseIdentityCrisis methods.
2. No pre/post build steps. This can be done with only C# code.
3. No IL manipulation.
4. You are free to make any modifications outside the Tests.cs file that you see fit (hint, none are required, but creative solutions are always welcome)

Solution

When you have a solution that causes one or both of the unit tests to pass, feel free to submit a pull request. I am happy to comment and see the solutions people come up with. Extra points for pull requests that include a description explaining why their solution works.

But Why?

Because brain teasers are fun and I love C#. As a professional developer I love learning the details of how my favorite language and its compiler work. I do not recommend that anyone write code like this in a production application. This type of code is best left to brain teasers.