catch exceptions that occur when printing test failures #273
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My specific case involved an object with circular references. When making a call to strictEqual(), I was getting:
TypeError: Converting circular structure to JSON
And then it would crash without running the rest of the tests or displaying the "FAILURES: 8/3136 assertions failed (3792ms)" line.
With this fix, I get a better display, a full stack trace, and the tests keep running.