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23d566209a
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---*\//'
54 lines
1.4 KiB
JavaScript
54 lines
1.4 KiB
JavaScript
// Copyright (C) 2016 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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description: Resolving with a thenable object value
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es6id: 25.4.4.3
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info: >
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[...]
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6. Let promiseCapability be NewPromiseCapability(C).
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[...]
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11. Let result be PerformPromiseRace(iteratorRecord, promiseCapability, C).
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[...]
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25.4.4.3.1 Runtime Semantics: PerformPromiseRace
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1. Repeat
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[...]
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j. Let result be Invoke(nextPromise, "then",
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«promiseCapability.[[Resolve]], promiseCapability.[[Reject]]»).
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25.4.1.3.2 Promise Resolve Functions
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[...]
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8. Let then be Get(resolution, "then").
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9. If then is an abrupt completion, then
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[...]
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10. Let thenAction be then.[[value]].
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11. If IsCallable(thenAction) is false, then
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[...]
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12. Perform EnqueueJob ("PromiseJobs", PromiseResolveThenableJob,
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«promise, resolution, thenAction»)
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flags: [async]
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---*/
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var value = {};
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var thenableValue = {
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then: function(resolve) {
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resolve(value);
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}
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};
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var thenable = {
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then: function(resolve) {
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resolve(thenableValue);
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}
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};
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Promise.race([thenable])
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.then(function(val) {
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if (val !== value) {
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$DONE('The promise should be resolved with the correct value.');
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return;
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}
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$DONE();
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}, function() {
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$DONE('The promise should not be rejected.');
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});
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