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What is test262?
test262 is a test suite intended to check agreement between JavaScript implementations and the ECMA-262 Specification (currently 5th Edition). The test suite contains thousands of individual tests, each of which tests some specific requirements of the ECMAScript specification.
What is ECMAScript?
"ECMAScript" is the name under which the language more commonly known as "JavaScript" is standardized. Development of the ECMAScript standard is the responsibility of Technical Committee 39 (TC39) of Ecma International. The ECMAScript standard is officially known as ECMA-262. ECMAScript 5 (or just ES5) is short hand for the "ECMA-262, 5th Edition ECMAScript Language Specification" the official name of the current edition of the standard. ECMAScript 5 was approved as an official Ecma standard by the Ecma General Assembly on December 3, 2009. The ECMAScript 5 Specification (PDF) is available from the Ecma International web site.
Who creates and maintains test262?
Development of test262 is a project of Ecma TC39. The testing framework and individual tests are created by member organizations of TC39 and contributed to Ecma for use in test262. For more information about how test262 is developed and maintained click the “Development” tab at the top of this page.
What is the status of test262?
test262 is not yet complete. It is still undergoing active development. Some portions of the ES5 specification have very complete test coverage while other portions of the specification have only partial test coverage. Some tests may be invalid or may yield false positive or false negative results. A perfect passing score on test262 does not guarantee that a JavaScript implementation perfectly supports ES5. Because tests are being actively added and modified, tests results from different days or times may not be directly comparable. Click the “Development” tab at the top of this page for instructions for reporting test262 bugs.
Running the Tests
Click the “Run” tab at the top of this page for instructions and follow the instructions to run the tests.
Development
Test262 is being developed by the members of Ecma TC39. Ecma's intellectual property policies, permit only Ecma members to directly contribute code to the project. However, a public mailing list is used to coordinate development of Test262. If you wish to participate in the discussion please subscribe. Bug reports and suggestions should be sent to the mailing list.
Ecma members can find detailed instructions on Test262 development procedures at the Test262 Wiki.
Please click on the Start button to start the test. Once you start the test you may pause the test anytime by clicking on the Pause button. You can click on the Results tab once the test is completed or after pausing the test. The Reset button is for restarting the test run.
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