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The original implementation of the test for the absense of a [[PromiseState]] internal slot did not actually assert the documented semantics. Re-implement the test to rely on the IsPromise abstract operation (via `Promise.prototype.then`) to accurately ensure that the object does not have a [[PromiseState]] internal slot. In relying on the semantics of the `instanceof` operator, the original test for the [[Prototype]] internal slot was imprecise (the assertion could be satisfied if additional objects were incorrectly defined on the prototype chain). Re-write the test to assert the value of the [[Prototype]] internal slot directly.
Test262 is the official ECMAScript (ECMA-262) conformance suite.
Test262 tests conformance to the continually maintained draft future ECMAScript standard found at http://tc39.github.io/ecma262/ , together with any Stage 3 or later TC39 proposals. It is maintained by Tom Care (@tcare) with significant contributions from many in the ECMAScript community.
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See CONTRIBUTING.md
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Running Test262
See INTERPRETING.md