4 The JS test suite is a fairly extensive collection of correctness and regression
5 tests for the Spidermonkey engine. Two harnesses run these tests: the shell test
6 harness in this directory and the "reftest" harness built into the browser, used
7 in continuous integration. The browser reftests require additional manifest files; these are
8 generated automatically by the build phase 'package-tests' using the
9 '--make-manifests' option to jstests.py.
14 https://firefox-source-docs.mozilla.org/js/build.html#testing
18 For general information, see
19 https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey/Creating_JavaScript_tests/jsreftests
24 Drop your test file in an appropriate directory under js/src/tests/non262/.
26 <fineprint> Some names are forbidden. Do not name your test browser.js,
27 shell.js, template.js, user.js, js-test-driver-begin.js, or
28 js-test-driver-end.js.
32 Test262, ECMAScript conformance tests
33 -------------------------------------
35 js/src/tests/test262/ contains a snapshot of the ECMAScript
36 conformance test suite: https://github.com/tc39/test262.
38 We periodically update the snapshot, but it's a manual process:
40 1. File a bug, modeled after bug 1560206, to announce your intent to
41 update the test suite.
43 2. Run `test262-update.py`.
47 4. Look at each failing test and either add an entry to the
48 `UNSUPPORTED_FEATURES` list in `test262-update.py`
49 or add a `skip script` entry to jstests.list, filing a bug if needed.
50 (Every skipped test should be associated with an open bug.)
52 5. Repeat steps 2-4 until there are no failing tests.
54 6. Post patches (as in bug 1560206).
56 When implementing a new feature, it is useful to enable tests for a
57 previously unsupported feature without going through all the steps
58 above. Here's how to do that:
60 1. Delete an entry from `UNSUPPORTED_FEATURES` in `test262-update.py`.
62 2. Run `./test262-update.py --revision $(head -n 1 test262/GIT-INFO | awk '{print $2}')`.
64 (This re-runs the script using the revision of test262 we most recently used,
65 instead of the latest revision.)
69 To export tests to the test262 format, for potential contribution to
70 test262, see `test262-export.py`.
73 Adjusting when and how a test runs
74 ----------------------------------
75 If the test is a test262 test, do this by editing jstests.list.
76 (The procedure below would be a bad idea because the test files are
77 autogenerated from the upstream test262 repository.)
79 Otherwise, put a comment at the top of the header matching the format:
80 // |reftest| <failure-type> -- <comment>
82 Where <failure-type> is a standard reftest <failure-type> string, as documented by:
83 http://searchfox.org/mozilla-central/source/layout/tools/reftest/README.txt
86 // |reftest| skip-if(!xulRuntime.shell) -- does not always dismiss alert
88 <fineprint> Either // or /* */ style comments may be used. The entire
89 comment must appear in the first 512 bytes of the file. The control
90 string must be in its own comment block. </fineprint>
92 When adding such comments to individual files is not feasible (e.g., for
93 imported tests), reftest manifest entries can be added to jstests.list
94 instead. Combining in-file comments with entries in this manifest file for
95 the same files is not supported (the one from the manifest file will be
96 used). Only the following two forms are supported:
97 <failure-type> include <relative_path>
98 <failure-type> script <relative_path>
99 include <relative_path>
100 The <type> "include" indicates that <failure-type> should apply to all test
101 cases within a directory. A statement for a nested directory or script
102 overrides one for an enclosing directory. The <type> "include" without a
103 <failure-type> recursively loads another jstests.list file for further