puppeteer/test/coverage.spec.js

/**
 * Copyright 2018 Google Inc. 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.
 */

const expect = require('expect');
const {
  getTestState,
  setupTestPageAndContextHooks,
  setupTestBrowserHooks,
} = require('./mocha-utils');

describe('Coverage specs', function () {
  describeChromeOnly('JSCoverage', function () {
    setupTestBrowserHooks();
    setupTestPageAndContextHooks();

    it('should work', async () => {
      const { page, server } = getTestState();
      await page.coverage.startJSCoverage();
      await page.goto(server.PREFIX + '/jscoverage/simple.html', {
        waitUntil: 'networkidle0',
      });
      const coverage = await page.coverage.stopJSCoverage();
      expect(coverage.length).toBe(1);
      expect(coverage[0].url).toContain('/jscoverage/simple.html');
      expect(coverage[0].ranges).toEqual([
        { start: 0, end: 17 },
        { start: 35, end: 61 },
      ]);
    });
    it('should report sourceURLs', async () => {
      const { page, server } = getTestState();

      await page.coverage.startJSCoverage();
      await page.goto(server.PREFIX + '/jscoverage/sourceurl.html');
      const coverage = await page.coverage.stopJSCoverage();
      expect(coverage.length).toBe(1);
      expect(coverage[0].url).toBe('nicename.js');
    });
    it('should ignore eval() scripts by default', async () => {
      const { page, server } = getTestState();

      await page.coverage.startJSCoverage();
      await page.goto(server.PREFIX + '/jscoverage/eval.html');
      const coverage = await page.coverage.stopJSCoverage();
      expect(coverage.length).toBe(1);
    });
    it("shouldn't ignore eval() scripts if reportAnonymousScripts is true", async () => {
      const { page, server } = getTestState();

      await page.coverage.startJSCoverage({ reportAnonymousScripts: true });
      await page.goto(server.PREFIX + '/jscoverage/eval.html');
      const coverage = await page.coverage.stopJSCoverage();
      expect(
        coverage.find((entry) => entry.url.startsWith('debugger://'))
      ).not.toBe(null);
      expect(coverage.length).toBe(2);
    });
    it('should ignore pptr internal scripts if reportAnonymousScripts is true', async () => {
      const { page, server } = getTestState();

      await page.coverage.startJSCoverage({ reportAnonymousScripts: true });
      await page.goto(server.EMPTY_PAGE);
      await page.evaluate('console.log("foo")');
      await page.evaluate(() => console.log('bar'));
      const coverage = await page.coverage.stopJSCoverage();
      expect(coverage.length).toBe(0);
    });
    it('should report multiple scripts', async () => {
      const { page, server } = getTestState();

      await page.coverage.startJSCoverage();
      await page.goto(server.PREFIX + '/jscoverage/multiple.html');
      const coverage = await page.coverage.stopJSCoverage();
      expect(coverage.length).toBe(2);
      coverage.sort((a, b) => a.url.localeCompare(b.url));
      expect(coverage[0].url).toContain('/jscoverage/script1.js');
      expect(coverage[1].url).toContain('/jscoverage/script2.js');
    });
    it('should report right ranges', async () => {
      const { page, server } = getTestState();

      await page.coverage.startJSCoverage();
      await page.goto(server.PREFIX + '/jscoverage/ranges.html');
      const coverage = await page.coverage.stopJSCoverage();
      expect(coverage.length).toBe(1);
      const entry = coverage[0];
      expect(entry.ranges.length).toBe(1);
      const range = entry.ranges[0];
      expect(entry.text.substring(range.start, range.end)).toBe(
        `console.log('used!');`
      );
    });
    it('should report scripts that have no coverage', async () => {
      const { page, server } = getTestState();

      await page.coverage.startJSCoverage();
      await page.goto(server.PREFIX + '/jscoverage/unused.html');
      const coverage = await page.coverage.stopJSCoverage();
      expect(coverage.length).toBe(1);
      const entry = coverage[0];
      expect(entry.url).toContain('unused.html');
      expect(entry.ranges.length).toBe(0);
    });
    it('should work with conditionals', async () => {
      const { page, server } = getTestState();

      await page.coverage.startJSCoverage();
      await page.goto(server.PREFIX + '/jscoverage/involved.html');
      const coverage = await page.coverage.stopJSCoverage();
      expect(
        JSON.stringify(coverage, null, 2).replace(/:\d{4}\//g, ':<PORT>/')
      ).toBeGolden('jscoverage-involved.txt');
    });
    describe('resetOnNavigation', function () {
      it('should report scripts across navigations when disabled', async () => {
        const { page, server } = getTestState();

        await page.coverage.startJSCoverage({ resetOnNavigation: false });
        await page.goto(server.PREFIX + '/jscoverage/multiple.html');
        await page.goto(server.EMPTY_PAGE);
        const coverage = await page.coverage.stopJSCoverage();
        expect(coverage.length).toBe(2);
      });

      it('should NOT report scripts across navigations when enabled', async () => {
        const { page, server } = getTestState();

        await page.coverage.startJSCoverage(); // Enabled by default.
        await page.goto(server.PREFIX + '/jscoverage/multiple.html');
        await page.goto(server.EMPTY_PAGE);
        const coverage = await page.coverage.stopJSCoverage();
        expect(coverage.length).toBe(0);
      });
    });
    // @see https://crbug.com/990945
    xit('should not hang when there is a debugger statement', async () => {
      const { page, server } = getTestState();

      await page.coverage.startJSCoverage();
      await page.goto(server.EMPTY_PAGE);
      await page.evaluate(() => {
        debugger; // eslint-disable-line no-debugger
      });
      await page.coverage.stopJSCoverage();
    });
  });

  describeChromeOnly('CSSCoverage', function () {
    setupTestBrowserHooks();
    setupTestPageAndContextHooks();

    it('should work', async () => {
      const { page, server } = getTestState();

      await page.coverage.startCSSCoverage();
      await page.goto(server.PREFIX + '/csscoverage/simple.html');
      const coverage = await page.coverage.stopCSSCoverage();
      expect(coverage.length).toBe(1);
      expect(coverage[0].url).toContain('/csscoverage/simple.html');
      expect(coverage[0].ranges).toEqual([{ start: 1, end: 22 }]);
      const range = coverage[0].ranges[0];
      expect(coverage[0].text.substring(range.start, range.end)).toBe(
        'div { color: green; }'
      );
    });
    it('should report sourceURLs', async () => {
      const { page, server } = getTestState();

      await page.coverage.startCSSCoverage();
      await page.goto(server.PREFIX + '/csscoverage/sourceurl.html');
      const coverage = await page.coverage.stopCSSCoverage();
      expect(coverage.length).toBe(1);
      expect(coverage[0].url).toBe('nicename.css');
    });
    it('should report multiple stylesheets', async () => {
      const { page, server } = getTestState();

      await page.coverage.startCSSCoverage();
      await page.goto(server.PREFIX + '/csscoverage/multiple.html');
      const coverage = await page.coverage.stopCSSCoverage();
      expect(coverage.length).toBe(2);
      coverage.sort((a, b) => a.url.localeCompare(b.url));
      expect(coverage[0].url).toContain('/csscoverage/stylesheet1.css');
      expect(coverage[1].url).toContain('/csscoverage/stylesheet2.css');
    });
    it('should report stylesheets that have no coverage', async () => {
      const { page, server } = getTestState();

      await page.coverage.startCSSCoverage();
      await page.goto(server.PREFIX + '/csscoverage/unused.html');
      const coverage = await page.coverage.stopCSSCoverage();
      expect(coverage.length).toBe(1);
      expect(coverage[0].url).toBe('unused.css');
      expect(coverage[0].ranges.length).toBe(0);
    });
    it('should work with media queries', async () => {
      const { page, server } = getTestState();

      await page.coverage.startCSSCoverage();
      await page.goto(server.PREFIX + '/csscoverage/media.html');
      const coverage = await page.coverage.stopCSSCoverage();
      expect(coverage.length).toBe(1);
      expect(coverage[0].url).toContain('/csscoverage/media.html');
      expect(coverage[0].ranges).toEqual([{ start: 17, end: 38 }]);
    });
    it('should work with complicated usecases', async () => {
      const { page, server } = getTestState();

      await page.coverage.startCSSCoverage();
      await page.goto(server.PREFIX + '/csscoverage/involved.html');
      const coverage = await page.coverage.stopCSSCoverage();
      expect(
        JSON.stringify(coverage, null, 2).replace(/:\d{4}\//g, ':<PORT>/')
      ).toBeGolden('csscoverage-involved.txt');
    });
    it('should ignore injected stylesheets', async () => {
      const { page } = getTestState();

      await page.coverage.startCSSCoverage();
      await page.addStyleTag({ content: 'body { margin: 10px;}' });
      // trigger style recalc
      const margin = await page.evaluate(
        () => window.getComputedStyle(document.body).margin
      );
      expect(margin).toBe('10px');
      const coverage = await page.coverage.stopCSSCoverage();
      expect(coverage.length).toBe(0);
    });
    describe('resetOnNavigation', function () {
      it('should report stylesheets across navigations', async () => {
        const { page, server } = getTestState();

        await page.coverage.startCSSCoverage({ resetOnNavigation: false });
        await page.goto(server.PREFIX + '/csscoverage/multiple.html');
        await page.goto(server.EMPTY_PAGE);
        const coverage = await page.coverage.stopCSSCoverage();
        expect(coverage.length).toBe(2);
      });
      it('should NOT report scripts across navigations', async () => {
        const { page, server } = getTestState();

        await page.coverage.startCSSCoverage(); // Enabled by default.
        await page.goto(server.PREFIX + '/csscoverage/multiple.html');
        await page.goto(server.EMPTY_PAGE);
        const coverage = await page.coverage.stopCSSCoverage();
        expect(coverage.length).toBe(0);
      });
    });
    it('should work with a recently loaded stylesheet', async () => {
      const { page, server } = getTestState();

      await page.coverage.startCSSCoverage();
      await page.evaluate(async (url) => {
        document.body.textContent = 'hello, world';

        const link = document.createElement('link');
        link.rel = 'stylesheet';
        link.href = url;
        document.head.appendChild(link);
        await new Promise((x) => (link.onload = x));
      }, server.PREFIX + '/csscoverage/stylesheet1.css');
      const coverage = await page.coverage.stopCSSCoverage();
      expect(coverage.length).toBe(1);
    });
  });
});