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test: implement in-process debug mode (#3486)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| /** | ||
| * Copyright Microsoft Corporation. All rights reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
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| const Mocha = require('mocha'); | ||
| const { fixturesUI } = require('./fixturesUI'); | ||
| const { EventEmitter } = require('events'); | ||
|
|
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| global.expect = require('expect'); | ||
| global.testOptions = require('./testOptions'); | ||
| const GoldenUtils = require('./GoldenUtils'); | ||
|
|
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| (function extendExpects() { | ||
| function toMatchImage(received, path) { | ||
| const {pass, message} = GoldenUtils.compare(received, path); | ||
| return {pass, message: () => message}; | ||
| }; | ||
| global.expect.extend({ toMatchImage }); | ||
| })(); | ||
|
|
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| class NullReporter {} | ||
|
|
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| class TestRunner extends EventEmitter { | ||
| constructor(file, options) { | ||
| super(); | ||
| this.mocha = new Mocha({ | ||
| ui: fixturesUI.bind(null, options.trialRun), | ||
| timeout: options.timeout, | ||
| reporter: NullReporter | ||
| }); | ||
| if (options.grep) | ||
| this.mocha.grep(options.grep); | ||
| this.mocha.addFile(file); | ||
| this.mocha.suite.filterOnly(); | ||
| this._lastOrdinal = -1; | ||
| this._failedWithError = false; | ||
| } | ||
|
|
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| async run() { | ||
| let callback; | ||
| const result = new Promise(f => callback = f); | ||
| const runner = this.mocha.run(callback); | ||
|
|
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| const constants = Mocha.Runner.constants; | ||
| runner.on(constants.EVENT_TEST_BEGIN, test => { | ||
| this.emit('test', { test: serializeTest(test, ++this._lastOrdinal) }); | ||
| }); | ||
|
|
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| runner.on(constants.EVENT_TEST_PENDING, test => { | ||
| this.emit('pending', { test: serializeTest(test, ++this._lastOrdinal) }); | ||
| }); | ||
|
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| runner.on(constants.EVENT_TEST_PASS, test => { | ||
| this.emit('pass', { test: serializeTest(test, this._lastOrdinal) }); | ||
| }); | ||
|
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| runner.on(constants.EVENT_TEST_FAIL, (test, error) => { | ||
| this._failedWithError = error; | ||
| this.emit('fail', { | ||
| test: serializeTest(test, this._lastOrdinal), | ||
| error: serializeError(error), | ||
| }); | ||
| }); | ||
|
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| runner.once(constants.EVENT_RUN_END, async () => { | ||
| this.emit('done', { stats: serializeStats(runner.stats), error: this._failedWithError }); | ||
| }); | ||
| await result; | ||
| } | ||
| } | ||
|
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| function serializeTest(test, origin) { | ||
| return { | ||
| id: `${test.file}::${origin}`, | ||
| duration: test.duration, | ||
| }; | ||
| } | ||
|
|
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| function serializeStats(stats) { | ||
| return { | ||
| tests: stats.tests, | ||
| passes: stats.passes, | ||
| duration: stats.duration, | ||
| failures: stats.failures, | ||
| pending: stats.pending, | ||
| } | ||
| } | ||
|
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| function trimCycles(obj) { | ||
| const cache = new Set(); | ||
| return JSON.parse( | ||
| JSON.stringify(obj, function(key, value) { | ||
| if (typeof value === 'object' && value !== null) { | ||
| if (cache.has(value)) | ||
| return '' + value; | ||
| cache.add(value); | ||
| } | ||
| return value; | ||
| }) | ||
| ); | ||
| } | ||
|
|
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| function serializeError(error) { | ||
| if (error instanceof Error) { | ||
| return { | ||
| message: error.message, | ||
| stack: error.stack | ||
| } | ||
| } | ||
| return trimCycles(error); | ||
| } | ||
|
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| module.exports = { TestRunner }; |
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