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Test262: ECMAScript Test Suite (ECMA TR/104)

Test262 is the implementation conformance test suite for the latest drafts (or most recent published edition) of the following Ecma specifications:

Test262 itself is described in ECMA TR/104 and is included in ECMA-414 (pdf).

Goals & State of Test262

The goal of Test262 is to provide test material that covers every observable behavior specified in the ECMA-414 Standards Suite. Development of Test262 is an on-going process. As of October 2017, Test262 consisted of over 29272 individual test files covering the majority of the pseudo-code algorithms and grammar productions defined in the ECMA-414 Standards Suite. Each of these files contains one or more distinct test cases. This marks the most comprehensive ECMAScript test suite to date. While test coverage is broad, TC39 does not consider coverage to be complete and as with any software project there exists the possibility of omissions and errors. This project welcomes any contributions to Test262 that help make test coverage of existing features more comprehensive.

ECMAScript feature proposals

As defined in the TC39 Process, Stage 4 Entrance Criteria requires tests for new feature proposals to advance. Tests may be written by proposal champions, implementers, or any interested community member.

A proposal champion is someone that worked on the feature proposal and specification directly.

An implementer is someone that works on implementing the proposal into a JavaScript engine, parser, runtime or embedding.