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test: do not inherit from the Node environment (#3348)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| /** | ||
| * 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 debug = require('debug'); | ||
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| const registrations = new Map(); | ||
|
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| class Fixture { | ||
| constructor(pool, name, scope, fn) { | ||
| this.pool = pool; | ||
| this.name = name; | ||
| this.scope = scope; | ||
| this.fn = fn; | ||
| this.deps = fixtureParameterNames(this.fn); | ||
| this.usages = new Set(); | ||
| this.value = null; | ||
| } | ||
|
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| async setup() { | ||
| for (const name of this.deps) { | ||
| await this.pool.setupFixture(name); | ||
| this.pool.instances.get(name).usages.add(this.name); | ||
| } | ||
|
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| const params = {}; | ||
| for (const n of this.deps) | ||
| params[n] = this.pool.instances.get(n).value; | ||
| let setupFenceFulfill; | ||
| let setupFenceReject; | ||
| const setupFence = new Promise((f, r) => { setupFenceFulfill = f; setupFenceReject = r; }); | ||
| const teardownFence = new Promise(f => this._teardownFenceCallback = f); | ||
| debug('pw:test:hook')(`setup "${this.name}"`); | ||
| this._tearDownComplete = this.fn(params, async value => { | ||
| this.value = value; | ||
| setupFenceFulfill(); | ||
| await teardownFence; | ||
| }).catch(e => setupFenceReject(e)); | ||
| await setupFence; | ||
| this._setup = true; | ||
| } | ||
|
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| async teardown() { | ||
| if (this._teardown) | ||
| return; | ||
| this._teardown = true; | ||
| for (const name of this.usages) { | ||
| const fixture = this.pool.instances.get(name); | ||
| if (!fixture) | ||
| continue; | ||
| await fixture.teardown(); | ||
| } | ||
| if (this._setup) { | ||
| debug('pw:test:hook')(`teardown "${this.name}"`); | ||
| this._teardownFenceCallback(); | ||
| } | ||
| await this._tearDownComplete; | ||
| this.pool.instances.delete(this.name); | ||
| } | ||
| } | ||
|
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| class FixturePool { | ||
| constructor() { | ||
| this.instances = new Map(); | ||
| } | ||
|
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| async setupFixture(name) { | ||
| let fixture = this.instances.get(name); | ||
| if (fixture) | ||
| return fixture; | ||
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| if (!registrations.has(name)) | ||
| throw new Error('Unknown fixture: ' + name); | ||
| const { scope, fn } = registrations.get(name); | ||
| fixture = new Fixture(this, name, scope, fn); | ||
| this.instances.set(name, fixture); | ||
| await fixture.setup(); | ||
| return fixture; | ||
| } | ||
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| async teardownScope(scope) { | ||
| for (const [name, fixture] of this.instances) { | ||
| if (fixture.scope === scope) | ||
| await fixture.teardown(); | ||
| } | ||
| } | ||
|
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| async resolveParametersAndRun(fn) { | ||
| const names = fixtureParameterNames(fn); | ||
| for (const name of names) | ||
| await this.setupFixture(name); | ||
| const params = {}; | ||
| for (const n of names) | ||
| params[n] = this.instances.get(n).value; | ||
| return fn(params); | ||
| } | ||
| } | ||
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| function fixtureParameterNames(fn) { | ||
| const text = fn.toString(); | ||
| const match = text.match(/async(?:\s+function)?\s*\(\s*{\s*([^}]*)\s*}/); | ||
| if (!match || !match[1].trim()) | ||
| return []; | ||
| let signature = match[1]; | ||
| return signature.split(',').map(t => t.trim()); | ||
| } | ||
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| function registerFixture(name, scope, fn) { | ||
| registrations.set(name, { scope, fn }); | ||
| } | ||
|
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| module.exports = { FixturePool, registerFixture }; |
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