added e2e test

e2e/__tests__/__snapshots__/coverageProjects.test.ts.snap

@@ -0,0 +1,13 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`outputs coverage report 1`] = `
+----------------|---------|----------|---------|---------|-------------------
+File            | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
+----------------|---------|----------|---------|---------|-------------------
+All files       |     100 |      100 |     100 |     100 |                   
+ add            |     100 |      100 |     100 |     100 |                   
+  index.js      |     100 |      100 |     100 |     100 |                   
+ mul            |     100 |      100 |     100 |     100 |                   
+  other_file.js |     100 |      100 |     100 |     100 |                   
+----------------|---------|----------|---------|---------|-------------------
+`;

e2e/__tests__/coverageProjects.test.ts

@@ -0,0 +1,35 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import * as fs from 'fs';
+import * as path from 'path';
+import {wrap} from 'jest-snapshot-serializer-raw';
+import {run} from '../Utils';
+import runJest from '../runJest';
+
+const DIR = path.resolve(__dirname, '../coverage-projects');
+
+beforeAll(() => {
+  run('yarn', DIR);
+});
+
+test('outputs coverage report', () => {
+  const {stdout, exitCode} = runJest(DIR, ['--no-cache', '--coverage'], {
+    stripAnsi: true,
+  });
+  const coverageDir = path.join(DIR, 'coverage');
+
+  // - the `index.js` file in package `mul` is ignored and should not be in the
+  //  coverage report.
+  expect(wrap(stdout)).toMatchSnapshot();
+
+  // `index.js` should only appear once (in package `add`)
+  expect(stdout.match(/index\.js/g)).toHaveLength(1);
+
+  expect(() => fs.accessSync(coverageDir, fs.F_OK)).not.toThrow();
+  expect(exitCode).toBe(0);
+});

e2e/coverage-projects/.gitignore

@@ -0,0 +1,2 @@
+coverage
+yarn-error.log

e2e/coverage-projects/package.json

@@ -0,0 +1,12 @@
+{
+  "private": true,
+  "workspaces": {
+    "packages": [
+      "packages/*"
+    ]
+  },
+  "jest": {
+    "collectCoverage": true,
+    "projects": ["packages/*"]
+  }
+}

e2e/coverage-projects/packages/add/index.js

@@ -0,0 +1,8 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+module.exports = (x, y) => x + y;

e2e/coverage-projects/packages/add/index.test.js

@@ -0,0 +1,14 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const add = require('.');
+
+describe('add', () => {
+  it('should add correctly', () => {
+    expect(add(2, 3)).toBe(5);
+  });
+});

e2e/coverage-projects/packages/add/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "add",
+  "private": true,
+  "jest": {
+    "collectCoverage": true,
+    "collectCoverageFrom": [
+      "!**.json",
+      "!<rootDir>/coverage/**"
+    ]
+  }
+}

e2e/coverage-projects/packages/mul/index.js

@@ -0,0 +1,8 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+module.exports = (x, y) => x * y;

e2e/coverage-projects/packages/mul/index.test.js

@@ -0,0 +1,14 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const mul = require('.');
+
+describe('mul', () => {
+  it('should multiply correctly', () => {
+    expect(mul(2, 3)).toBe(6);
+  });
+});

e2e/coverage-projects/packages/mul/other_file.js

@@ -0,0 +1,8 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+module.exports = () => 'hello';

e2e/coverage-projects/packages/mul/other_file.test.js

@@ -0,0 +1,14 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const hello = require('./other_file');
+
+describe('other_file', () => {
+  it('should output hello', () => {
+    expect(hello()).toBe('hello');
+  });
+});

e2e/coverage-projects/packages/mul/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "mul",
+  "private": true,
+  "jest": {
+    "collectCoverage": true,
+    "collectCoverageFrom": [
+      "!**.json",
+      "!<rootDir>/coverage/**",
+      "!<rootDir>/index.js"
+    ]
+  }
+}

e2e/coverage-projects/yarn.lock

@@ -0,0 +1,4 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+