qunitjs / qunit / 3345

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Assert: Fix assert.throws() to fail gracefully when expected class does not match

Previously when the expected value was a class, and it did not satisfy instanceof,
the class function was also tried as a matcher function which in the case of
ES6 class constructors throws by default, which we did not internally catch,
causing a rather abrupt test failure rather than a more informative one.

Fixes https://github.com/qunitjs/qunit/issues/1530.

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