Catch unhandled AssertionErrors

[aaronabramov]

right now if something throws an assertion error (e.g. assert.equal(1, 2)) we just print the error message.
AssertionError actually has a lot of info in it (actual, expected values) and we can pretty print the diff of two objects (mocha does that)

> try {assert.equal(1, 2)} catch (e) {e}
{ AssertionError: 1 == 2
  name: 'AssertionError',
  actual: 1,
  expected: 2,
  operator: '==',
  message: '1 == 2',
  generatedMessage: true }

this is especially useful for things like eslint RuleTester that uses assert and delegates its testing to global.it.

eslint/eslint#6532

[cpojer]

I don't think we'll get to this anytime soon. I'm gonna close it to clean up the queue but feel free to make a PR.

[github-actions]

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