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(error_ => error = error_);
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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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