56 lines
2.1 KiB
JavaScript
56 lines
2.1 KiB
JavaScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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/*
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* Script that determines the sharded tests for the current CircleCI container. CircleCI starts
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* multiple containers if the "parallelism" option has been specified and this script splits up
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* the integration tests into shards based on the amount of parallelism.
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*
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* It's also possible to manually specify tests which should run on a container because some
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* integration tests are more complex and take up more time. In order to properly balance the
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* duration of each container, we allow manual test shards to be specified.
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*
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* The output of this script can then be used to only run the tests which are assigned to the
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* current CircleCI container.
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*/
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const fs = require('fs');
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const path = require('path');
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const minimist = require('minimist');
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// Parsed command line arguments.
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const {_, shardIndex, maxShards} = minimist(process.argv.slice(2));
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// Ensure that all CLI options are set properly.
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if (shardIndex == null) {
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throw new Error('The "--shardIndex" option has not been specified.')
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} else if (maxShards == null) {
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throw new Error('The "--maxShards" option has not been specified.');
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}
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if (shardIndex >= maxShards) {
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throw new Error('shardIndex out of bounds');
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}
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printTestNames(getTestsForShardIndex(_, shardIndex, maxShards));
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/**
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* Splits the specified tests into a limited amount of shards and returns the tests that should
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* run on the given shard. The shards of tests are being created deterministically and therefore
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* we get reproducible tests when executing the same script multiple times.
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*/
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function getTestsForShardIndex(tests, shardIndex, maxShards) {
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return tests.filter((n, index) => index % maxShards === shardIndex);
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}
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/** Prints the specified test names to the stdout. */
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function printTestNames(testNames) {
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// Print the test names joined with spaces because this allows Bash to easily convert the output
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// of this script into an array.
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process.stdout.write(testNames.join(' '));
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}
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