Add tests that assert behavior when a Promise is resolved with another
Promise whose `then` method has been overridden. Because all objects
with a `then` method are treated equivalently, the presence of a
[[PromiseState]] internal slot should have no effect on program
behavior.
These tests guard against a faulty optimization originally implemented
in V8:
https://bugs.chromium.org/p/v8/issues/detail?id=3641
Remove files that tested both PerformPromiseThen and
PromiseResolveFunction in favor of new tests that test
PromiseResolveFunction more directly and completely.
Uniformly and exhaustively test the generic aspects of the static- and
instance Promise methods, including:
- function `length` properties
- function `name` properties
- method property descriptors
Mike Pennisi
Gorkem Yakin
André Bargull
Jordan Harband
smikes
Rick Waldron