Example for Playwright Coverage Reports

.eslintrc.js

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+// https://eslint.org/docs/rules/
+module.exports = {
+    'root': true,
+    // system globals
+    'env': {
+        'node': true,
+        'browser': true,
+        'amd': true,
+        'commonjs': true,
+        'es6': true
+    },
+    // other globals
+    'globals': {
+    },
+
+    'plugins': [
+    ],
+
+    'extends': [
+        'plus'
+    ],
+
+    'parserOptions': {
+        'ecmaVersion': 'latest',
+        'sourceType': 'module'
+    },
+
+    'rules': {
+        'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'warn'
+    }
+};

.gitignore

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+node_modules/
+/test-results/
+/playwright-report/
+/blob-report/
+/playwright/.cache/
+
+/coverage-reports
+/package-lock.json

.vscode/settings.json

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+{
+    "[typescript]": {
+        "editor.defaultFormatter": "dbaeumer.vscode-eslint"
+    },
+    "[javascript]": {
+        "editor.defaultFormatter": "dbaeumer.vscode-eslint"
+    },
+    "editor.codeActionsOnSave": {
+        "source.fixAll.eslint": "explicit"
+    },
+    "editor.formatOnSave": true,
+    "eslint.format.enable": true,
+    "eslint.validate": [
+        "typescript",
+        "javascript"
+    ],
+    "git.ignoreLimitWarning": true
+}

README.md

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 # playwright-coverage
-Playwright Coverage Reports
+Example for Playwright Coverage Reports
+
+## Install
+```sh
+npm i monocart-coverage-reports -D
+```
+
+- Create `autoTestFixture` for collecting coverage data, see [fixtures.ts](fixtures.ts)
+- Create [global.setup.ts](global.setup.ts) and [global-teardown.ts](global-teardown.ts) for generating coverage reports
+- Set coverage options in config [mcr.config.ts](mcr.config.ts)
+- Playwright config [playwright.config.ts](playwright.config.ts)
+
+```sh
+npm run test
+```
+The coverage report will be found here: `coverage-reports/index.html`
+
+Check repo [monocart coverage reports](https://github.com/cenfun/monocart-coverage-reports) for more options.

fixtures.ts

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+import { test as testBase } from '@playwright/test';
+import MCR from 'monocart-coverage-reports';
+import coverageOptions from './mcr.config';
+
+// fixtures
+const test = testBase.extend({
+    autoTestFixture: [async ({ page }, use) => {
+
+        const isChromium = test.info().project.name === 'chromium';
+
+        // console.log('autoTestFixture setup...');
+        // coverage API is chromium only
+        if (isChromium) {
+            await Promise.all([
+                page.coverage.startJSCoverage({
+                    resetOnNavigation: false
+                }),
+                page.coverage.startCSSCoverage({
+                    resetOnNavigation: false
+                })
+            ]);
+        }
+
+        await use('autoTestFixture');
+
+        // console.log('autoTestFixture teardown...');
+        if (isChromium) {
+            const [jsCoverage, cssCoverage] = await Promise.all([
+                page.coverage.stopJSCoverage(),
+                page.coverage.stopCSSCoverage()
+            ]);
+            const coverageList = [... jsCoverage, ... cssCoverage];
+            // console.log(coverageList.map((item) => item.url));
+            const mcr = MCR(coverageOptions);
+            await mcr.add(coverageList);
+        }
+
+    }, {
+        scope: 'test',
+        auto: true
+    }]
+});
+
+export { test };

global-teardown.ts

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+import MCR from 'monocart-coverage-reports';
+import coverageOptions from './mcr.config';
+
+async function globalTeardown(config) {
+    const mcr = MCR(coverageOptions);
+    await mcr.generate();
+}
+
+export default globalTeardown;

global.setup.ts

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+import MCR from 'monocart-coverage-reports';
+import coverageOptions from './mcr.config';
+
+async function globalSetup(config) {
+    const mcr = MCR(coverageOptions);
+    await mcr.cleanCache();
+}
+
+export default globalSetup;

mcr.config.ts

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+export default {
+
+    name: 'My Playwright Coverage Report',
+
+    reports: [
+        'console-details',
+        'v8'
+    ],
+
+    // entryFilter: {
+    //     '**/node_modules/**': false,
+    //     '**/*.js': true
+    // },
+
+    outputDir: './coverage-reports'
+};

package.json

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+{
+    "name": "playwright-coverage",
+    "version": "1.0.0",
+    "description": "Playwright Coverage Reports",
+    "main": "index.js",
+    "scripts": {
+        "test": "npx playwright test"
+    },
+    "license": "MIT",
+    "devDependencies": {
+        "@playwright/test": "^1.42.1",
+        "@types/node": "^20.11.30",
+        "eslint": "^8.57.0",
+        "eslint-config-plus": "^1.0.6",
+        "monocart-coverage-reports": "^2.7.6"
+    },
+    "dependencies": {}
+}

playwright.config.ts

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+import { defineConfig, devices } from '@playwright/test';
+
+/**
+ * Read environment variables from file.
+ * https://github.com/motdotla/dotenv
+ */
+// require('dotenv').config();
+
+/**
+ * See https://playwright.dev/docs/test-configuration.
+ */
+export default defineConfig({
+    testDir: './tests',
+
+    /* Run tests in files in parallel */
+    fullyParallel: true,
+
+    /* Fail the build on CI if you accidentally left test.only in the source code. */
+    forbidOnly: Boolean(process.env.CI),
+
+    /* Retry on CI only */
+    retries: process.env.CI ? 2 : 0,
+
+    /* Opt out of parallel tests on CI. */
+    // workers: process.env.CI ? 1 : undefined,
+
+    /* Reporter to use. See https://playwright.dev/docs/test-reporters */
+    reporter: 'html',
+
+    globalSetup: 'global.setup.ts',
+    globalTeardown: 'global-teardown.ts',
+
+    /* Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions. */
+    use: {
+
+        /* Base URL to use in actions like `await page.goto('/')`. */
+        // baseURL: 'http://127.0.0.1:3000',
+
+        /* Collect trace when retrying the failed test. See https://playwright.dev/docs/trace-viewer */
+        trace: 'on-first-retry'
+    },
+
+    /* Configure projects for major browsers */
+    projects: [
+        {
+            name: 'chromium',
+            use: {
+                ... devices['Desktop Chrome']
+            }
+        },
+
+        {
+            name: 'firefox',
+            use: {
+                ... devices['Desktop Firefox']
+            }
+        },
+
+        {
+            name: 'webkit',
+            use: {
+                ... devices['Desktop Safari']
+            }
+        }
+
+        /* Test against mobile viewports. */
+        // {
+        //   name: 'Mobile Chrome',
+        //   use: { ...devices['Pixel 5'] },
+        // },
+        // {
+        //   name: 'Mobile Safari',
+        //   use: { ...devices['iPhone 12'] },
+        // },
+
+    /* Test against branded browsers. */
+    // {
+    //   name: 'Microsoft Edge',
+    //   use: { ...devices['Desktop Edge'], channel: 'msedge' },
+    // },
+    // {
+    //   name: 'Google Chrome',
+    //   use: { ...devices['Desktop Chrome'], channel: 'chrome' },
+    // },
+    ]
+
+    /* Run your local dev server before starting the tests */
+    // webServer: {
+    //   command: 'npm run start',
+    //   url: 'http://127.0.0.1:3000',
+    //   reuseExistingServer: !process.env.CI,
+    // },
+});

tests/demo-todo-app.spec.ts

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+import { expect } from '@playwright/test';
+import { test } from '../fixtures';
+
+test.beforeEach(async ({ page }) => {
+    await page.goto('https://demo.playwright.dev/todomvc');
+});
+
+const TODO_ITEMS = [
+    'buy some cheese',
+    'feed the cat',
+    'book a doctors appointment'
+];
+
+test.describe('New Todo', () => {
+    test('should allow me to add todo items', async ({ page }) => {
+    // create a new todo locator
+        const newTodo = page.getByPlaceholder('What needs to be done?');
+
+        // Create 1st todo.
+        await newTodo.fill(TODO_ITEMS[0]);
+        await newTodo.press('Enter');
+
+        // Make sure the list only has one todo item.
+        await expect(page.getByTestId('todo-title')).toHaveText([
+            TODO_ITEMS[0]
+        ]);
+
+        // Create 2nd todo.
+        await newTodo.fill(TODO_ITEMS[1]);
+        await newTodo.press('Enter');
+
+        // Make sure the list now has two todo items.
+        await expect(page.getByTestId('todo-title')).toHaveText([
+            TODO_ITEMS[0],
+            TODO_ITEMS[1]
+        ]);
+
+
+    });
+
+    test('should clear text input field when an item is added', async ({ page }) => {
+    // create a new todo locator
+        const newTodo = page.getByPlaceholder('What needs to be done?');
+
+        // Create one todo item.
+        await newTodo.fill(TODO_ITEMS[0]);
+        await newTodo.press('Enter');
+
+        // Check that input is empty.
+        await expect(newTodo).toBeEmpty();
+
+    });
+
+});

tests/example.spec.ts

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+import { expect } from '@playwright/test';
+import { test } from '../fixtures';
+
+test('has title', async ({ page }) => {
+    await page.goto('https://playwright.dev/');
+
+    // Expect a title "to contain" a substring.
+    await expect(page).toHaveTitle(/Playwright/);
+});