Unlike PHP, in JavaScript ! has higher precedence than instanceof, thus !smth instanceof TypeError will never (unless @@hasInstance is defined) be true.
As written, the example for asserting runtime errors is written with an
early error. Because the error is expected to be reported prior to
program execution, the `assert.throws` function cannot be used to detect
it.
Demonstrate the usage of the helper function with a runtime error.
For asynchronous tests, the contract between test file and test runner
is implicit: runners are expected to inspect the source code for
references to a global `$DONE` identifier.
Promote a more explicit contract between test file and test runner by
introducing a new frontmatter "tag", `async`. This brings asynchronous
test configuration in-line with other configuration mechanisms and also
provides a more natural means of test filtering.
The modifications to test files was made programatically using the
`grep` and `sed` utilities:
$ grep "\$DONE" test/ -r --files-with-match --null | \
xargs -0 sed -i 's/^\(flags:\s*\)\[/\1[async, /g'
$ grep "\$DONE" test/ -rl --null | \
xargs -0 grep -E '^flags:' --files-without-match --null | \
xargs -0 sed -i 's/^---\*\//flags: [async]\n---*\//'
It was recently decided to prefer the new `id` tag over the existing
`es5id` and `es6id` tag when authoring tests. Update the contribution
guidelines to reference the new tag.
Some tests involving the directive prologue are invalidated by source
text transformations that insert executable code in the beginning of the
script. Implement a `raw` flag that allows these tests to opt-out of
this transformation. Update the relevant tests to use this flag (and
remove references to globals only available when code is injected).
Update the Python runner accordingly:
- Do not run tests marked as "raw" in strict mode
- Reject invalid test configurations
Update the browser runner accordingly:
- Do not modify the script body of tests marked as "raw"
Unlike the console runner, the browser runner does not modify the
strictness of tests prior to running them. Regardless of a given test's
metadata, it runs every test exactly once, and it never enables strict
mode. This means that tests intended to function in strict mode must
declare the "use strict"; directive prologue in addition to the
`onlyStrict` flag.
For any test that specifies the `onlyStrict` metadata flag, transform
the source code by injecting a "use strict" directive prologue prior to
running the test.
- Remove trailing white space
- Streamline documentation of test tags
- Do not reference obsolete tags
- Document `features` frontmatter tag
- Document `es6id` frontmatter tag
- Omit unnecessary detail about test262 website generation. This is not
directly useful to potential test contributors. Implementation details
like these can be taken for granted by that audience.
- Remove documentation on YAML syntax. Details on YAML may be helpful
for some new contributors, but this document should not attempt to
cover the topic (especially not from the description of a specific
frontmatter entry). Replace with a link to a more comprehensive source
as this will be more generally useful to those who need it (and less
obtrusive for those who do not).
- Consolidate information on test helpers
- Document `assert` helpers
- Update instructions for asserting errors. Since the introduction of
`assert.throws` in gh-22, the preferred means of expressing
expectations regarding errors has changed. Update the CONTRIBUTING.md
file to reflect the latest approach. Explain purpose of `throw
NotEarlyError;` in example test.
- Re-order information on file names. The inconsistency in the project's
file names should not go unmentioned, but neither should it not
preceed instructions for the accepted approach to namine tests.
- More clearly document required frontmatter tags. Explicitly list
`description` as a required frontmatter tag, implicitly identifying
all other tags as optional.
CONTRIBUTING.md
- document `timeout` tag
- reorder tags in frontmatter doc
- minor cleanups
- minor fixes
- add style note
- reformat flags
- remove discussion of obsolete $INCLUDE
- incorporate line notes from @domenic
- integrate additional comments
- add links back, move arg notes down
- Raise outline level by one
README.md
- link to CONTRIBUTING
Add section on test environment
Add section on custom helpers
describe YAML frontmatter
Fix minor formatting errors
document $INCLUDE as obsolete
Change documentation of negative error
Move test environment and custom helpers down
indent copyright and frontmatter sections
better description of the async calls between a promise
and the functions in its `.then`
Correct Early Error example: don't throw a string
CONSOLE-RUNNER: split runner doc into new file
add troubleshooting section
add a table showing which print handle to use when
running async tests through test262.py runner
@anba contributed information about async tests in
SpiderMonkey and JavaScriptCore
add a section on requirements for using console test runner test262.py
add a section on asynchronous tests
add subsection to authoring guidelines with suggestion for test names
Mike Pennisi
Tim Disney
Aleksey Shvayka
Leo Balter
Gorkem Yakin
Brian Terlson
Domenic Denicola
Rick Waldron
Sam Mikes
Murat Sutunc