17cd8703f9
Rather than maintain our own test runner we should instead lean on the community and use Mocha which is very popular and also our test runner of choice in DevTools too. Note that this commit doesn't remove the TestRunner source as it's still used for other unit tests, but they will be updated in a future PR and then we can remove the TestRunner. The main bulk of this PR is updating the tests as the old TestRunner passed in contextual data via the `it` function callback whereas Mocha does not, so we introduce some helpers for the tests to make it easier.
113 lines
3.7 KiB
JavaScript
113 lines
3.7 KiB
JavaScript
/**
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* Copyright 2017 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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 expect = require('expect');
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const {getTestState} = require('./mocha-utils');
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describeChromeOnly('Tracing', function() {
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let outputFile;
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let browser;
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let page;
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/* we manually manage the browser here as we want a new browser for each
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* individual test, which isn't the default behaviour of getTestState()
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*/
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beforeEach(async() => {
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const {defaultBrowserOptions, puppeteer} = getTestState();
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browser = await puppeteer.launch(defaultBrowserOptions);
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page = await browser.newPage();
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outputFile = path.join(__dirname, 'assets', 'trace.json');
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});
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afterEach(async() => {
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await browser.close();
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browser = null;
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page = null;
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if (fs.existsSync(outputFile)) {
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fs.unlinkSync(outputFile);
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outputFile = null;
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}
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});
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it('should output a trace', async() => {
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const { server} = getTestState();
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await page.tracing.start({screenshots: true, path: outputFile});
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await page.goto(server.PREFIX + '/grid.html');
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await page.tracing.stop();
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expect(fs.existsSync(outputFile)).toBe(true);
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});
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it('should run with custom categories if provided', async() => {
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await page.tracing.start({path: outputFile, categories: ['disabled-by-default-v8.cpu_profiler.hires']});
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await page.tracing.stop();
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const traceJson = JSON.parse(fs.readFileSync(outputFile));
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expect(traceJson.metadata['trace-config']).toContain('disabled-by-default-v8.cpu_profiler.hires');
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});
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it('should throw if tracing on two pages', async() => {
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await page.tracing.start({path: outputFile});
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const newPage = await browser.newPage();
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let error = null;
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await newPage.tracing.start({path: outputFile}).catch(e => error = e);
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await newPage.close();
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expect(error).toBeTruthy();
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await page.tracing.stop();
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});
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it('should return a buffer', async() => {
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const { server } = getTestState();
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await page.tracing.start({screenshots: true, path: outputFile});
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await page.goto(server.PREFIX + '/grid.html');
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const trace = await page.tracing.stop();
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const buf = fs.readFileSync(outputFile);
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expect(trace.toString()).toEqual(buf.toString());
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});
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it('should work without options', async() => {
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const { server } = getTestState();
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await page.tracing.start();
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await page.goto(server.PREFIX + '/grid.html');
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const trace = await page.tracing.stop();
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expect(trace).toBeTruthy();
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});
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it('should return null in case of Buffer error', async() => {
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const { server } = getTestState();
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await page.tracing.start({screenshots: true});
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await page.goto(server.PREFIX + '/grid.html');
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const oldBufferConcat = Buffer.concat;
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Buffer.concat = bufs => {
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throw 'error';
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};
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const trace = await page.tracing.stop();
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expect(trace).toEqual(null);
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Buffer.concat = oldBufferConcat;
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});
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it('should support a buffer without a path', async() => {
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const { server } = getTestState();
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await page.tracing.start({screenshots: true});
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await page.goto(server.PREFIX + '/grid.html');
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const trace = await page.tracing.stop();
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expect(trace.toString()).toContain('screenshot');
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});
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});
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