Integrated with Yarn workspaces (jestjs#3906)

* enabled workspaces

* updated lerna to 2.0.0 with workspaces support

Author: bestander

.yarnrc

@@ -0,0 +1,2 @@
+
+workspaces-experimental true

appveyor.yml

@@ -5,15 +5,17 @@ environment:
 install:
   - ps: Install-Product node $env:nodejs_version x64
   - node --version
-  - yarn --version
-  - yarn install
+  - curl -fsSL -o yarn.js https://github.com/yarnpkg/yarn/releases/download/v0.27.5/yarn-0.27.5.js
+  - node ./yarn.js --version
+  - node ./yarn.js install
+  - node ./yarn.js run build
 
 cache:
   - node_modules
   - .eslintcache
 
 test_script:
-  - yarn run jest -- --color
+  - node ./yarn.js run jest -- --color
 
 # Don't actually build.
 build: off

circle.yml

@@ -1,6 +1,6 @@
 machine:
   environment:
-    YARN_VERSION: 0.20.3
+    YARN_VERSION: 0.27.5
     PATH: "${PATH}:${HOME}/.yarn/bin:${HOME}/${CIRCLE_PROJECT_REPONAME}/node_modules/.bin"
   node:
     version: 8

integration_tests/__tests__/__snapshots__/show_config.test.js.snap

@@ -37,7 +37,7 @@ exports[`jest --showConfig outputs config info and exits 1`] = `
       "/mocked/root/path/jest/node_modules/regenerator-runtime/runtime.js"
     ],
     "snapshotSerializers": [],
-    "testEnvironment": "/mocked/root/path/jest/packages/jest-environment-node/build/index.js",
+    "testEnvironment": "/mocked/root/path/jest/node_modules/jest-environment-node/build/index.js",
     "testMatch": [
       "**/__tests__/**/*.js?(x)",
       "**/?(*.)(spec|test).js?(x)"
@@ -52,7 +52,7 @@ exports[`jest --showConfig outputs config info and exits 1`] = `
     "transform": [
       [
         "^.+\\\\.jsx?$",
-        "/mocked/root/path/jest/integration_tests/verbose_reporter/node_modules/babel-jest/build/index.js"
+        "/mocked/root/path/jest/node_modules/babel-jest/build/index.js"
       ]
     ],
     "transformIgnorePatterns": [

integration_tests/__tests__/babel_plugin_jest_hoist.test.js

@@ -11,7 +11,7 @@
 
 const path = require('path');
 const skipOnWindows = require('skipOnWindows');
-const {linkJestPackage, run} = require('../utils');
+const {run} = require('../utils');
 const runJest = require('../runJest');
 
 const DIR = path.resolve(__dirname, '..', 'babel-plugin-jest-hoist');
@@ -21,8 +21,6 @@ skipOnWindows.suite();
 if (process.platform !== 'win32') {
   beforeEach(() => {
     run('yarn', DIR);
-    linkJestPackage('babel-plugin-jest-hoist', DIR);
-    linkJestPackage('babel-jest', DIR);
   });
 }
 

integration_tests/__tests__/coverage_report.test.js

@@ -12,15 +12,11 @@
 const fs = require('fs');
 const path = require('path');
 const skipOnWindows = require('skipOnWindows');
-const {extractSummary, linkJestPackage} = require('../utils');
+const {extractSummary} = require('../utils');
 const runJest = require('../runJest');
 
 const DIR = path.resolve(__dirname, '../coverage_report');
 
-if (process.platform !== 'win32') {
-  beforeEach(() => linkJestPackage('babel-jest', DIR));
-}
-
 skipOnWindows.suite();
 
 test('outputs coverage report', () => {

integration_tests/__tests__/debug.test.js

@@ -8,20 +8,13 @@
 
 const path = require('path');
 const skipOnWindows = require('skipOnWindows');
-const {linkJestPackage} = require('../utils');
 const runJest = require('../runJest');
 
 describe('jest --debug', () => {
   skipOnWindows.suite();
 
   const dir = path.resolve(__dirname, '..', 'verbose_reporter');
 
-  beforeEach(() => {
-    if (process.platform !== 'win32') {
-      linkJestPackage('babel-jest', dir);
-    }
-  });
-
   it('outputs debugging info before running the test', () => {
     const {stdout} = runJest(dir, ['--debug', '--no-cache']);
     expect(stdout).toMatch('"version": "');

integration_tests/__tests__/native_async_mock.test.js

@@ -10,7 +10,7 @@
 
 const path = require('path');
 const skipOnWindows = require('skipOnWindows');
-const {linkJestPackage, run, extractSummary} = require('../utils');
+const {run, extractSummary} = require('../utils');
 const runJest = require('../runJest');
 
 skipOnWindows.suite();
@@ -22,7 +22,6 @@ test('mocks async functions', () => {
   }
   if (process.platform !== 'win32') {
     run('yarn', dir);
-    linkJestPackage('babel-jest', dir);
   }
   // --no-cache because babel can cache stuff and result in false green
   const {stderr} = runJest(dir, ['--no-cache']);

integration_tests/__tests__/show_config.test.js

@@ -10,20 +10,13 @@
 
 const path = require('path');
 const skipOnWindows = require('skipOnWindows');
-const {linkJestPackage} = require('../utils');
 const runJest = require('../runJest');
 
 describe('jest --showConfig', () => {
   skipOnWindows.suite();
 
   const dir = path.resolve(__dirname, '..', 'verbose_reporter');
 
-  beforeEach(() => {
-    if (process.platform !== 'win32') {
-      linkJestPackage('babel-jest', dir);
-    }
-  });
-
   it('outputs config info and exits', () => {
     const root = path.join(__dirname, '..', '..', '..');
     expect.addSnapshotSerializer({

integration_tests/__tests__/transform.test.js

@@ -8,8 +8,15 @@
 
 const path = require('path');
 const skipOnWindows = require('skipOnWindows');
-const {linkJestPackage, run} = require('../utils');
+const {
+  run,
+  cleanup,
+  createEmptyPackage,
+  linkJestPackage,
+  copyDir,
+} = require('../utils');
 const runJest = require('../runJest');
+const os = require('os');
 
 describe('babel-jest', () => {
   skipOnWindows.suite();
@@ -18,7 +25,6 @@ describe('babel-jest', () => {
   beforeEach(() => {
     if (process.platform !== 'win32') {
       run('yarn', dir);
-      linkJestPackage('babel-jest', dir);
     }
   });
 
@@ -39,17 +45,32 @@ describe('babel-jest', () => {
   });
 });
 
+// babel-jest is automatically linked at the root because it is a workspace now
+// a way to test this in isolation is to move the test suite into a temp folder
 describe('no babel-jest', () => {
   const dir = path.resolve(__dirname, '..', 'transform/no-babel-jest');
+  // doing test in a temp directory because we don't want jest node_modules affect it
+  const tempDir = path.resolve(os.tmpdir(), 'transform-no-babel-jest');
+
+  beforeEach(() => {
+    cleanup(tempDir);
+    createEmptyPackage(tempDir);
+    copyDir(dir, tempDir);
+    linkJestPackage('babel-jest', tempDir);
+  });
 
   it('fails with syntax error on flow types', () => {
-    const {stderr} = runJest(dir, ['--no-cache']);
+    const {stderr} = runJest(tempDir, ['--no-cache', '--no-watchman']);
     expect(stderr).toMatch(/FAIL.*fails_with_syntax_error/);
-    expect(stderr).toMatch('SyntaxError: Unexpected token :');
+    expect(stderr).toMatch('Unexpected token');
   });
 
   test('instrumentation with no babel-jest', () => {
-    const {stdout} = runJest(dir, ['--no-cache', '--coverage']);
+    const {stdout} = runJest(tempDir, [
+      '--no-cache',
+      '--coverage',
+      '--no-watchman',
+    ]);
     expect(stdout).toMatch('covered.js');
     expect(stdout).not.toMatch('excluded_from_coverage.js');
     // coverage result should not change
@@ -87,7 +108,6 @@ describe('multiple-transformers', () => {
   beforeEach(() => {
     if (process.platform !== 'win32') {
       run('yarn', dir);
-      linkJestPackage('babel-jest', dir);
     }
   });
 

integration_tests/utils.js

@@ -88,6 +88,20 @@ const writeFiles = (directory: string, files: {[filename: string]: string}) => {
   });
 };
 
+const copyDir = (src: string, dest: string) => {
+  const srcStat = fs.lstatSync(src);
+  if (srcStat.isDirectory()) {
+    if (!fs.existsSync(dest)) {
+      fs.mkdirSync(dest);
+    }
+    fs.readdirSync(src).map(filePath => {
+      return copyDir(path.join(src, filePath), path.join(dest, filePath));
+    });
+  } else {
+    fs.writeFileSync(dest, fs.readFileSync(src));
+  }
+};
+
 const createEmptyPackage = (directory, packageJson) => {
   const DEFAULT_PACKAGE_JSON = {
     description: 'THIS IS AN AUTOGENERATED FILE AND SHOULD NOT BE ADDED TO GIT',
@@ -147,6 +161,7 @@ const cleanupStackTrace = (output: string) => {
 module.exports = {
   cleanup,
   cleanupStackTrace,
+  copyDir,
   createEmptyPackage,
   extractSummary,
   fileExists,

lerna.json

@@ -1,8 +1,6 @@
 {
-  "lerna": "2.0.0-rc.4",
+  "lerna": "2.0.0",
   "version": "20.0.4",
   "npmClient": "yarn",
-  "packages": [
-    "packages/*"
-  ]
+  "useWorkspaces": true
 }

package.json

@@ -27,6 +27,7 @@
     "eslint-plugin-babel": "^4.1.1",
     "eslint-plugin-flowtype": "^2.34.0",
     "eslint-plugin-import": "^2.6.0",
+    "eslint-plugin-jest": "^20.0.3",
     "eslint-plugin-markdown": "^1.0.0-beta.6",
     "eslint-plugin-prettier": "^2.1.2",
     "eslint-plugin-react": "^7.1.0",
@@ -45,7 +46,7 @@
     "karma-chrome-launcher": "^2.1.1",
     "karma-mocha": "^1.3.0",
     "left-pad": "^1.1.1",
-    "lerna": "2.0.0-rc.4",
+    "lerna": "2.0.0",
     "micromatch": "^2.3.11",
     "mkdirp": "^0.5.1",
     "mocha": "^3.4.2",
@@ -78,7 +79,7 @@
     "jest-coverage": "yarn run jest --silent -- --coverage",
     "lint": "eslint . --cache --ext js,md",
     "lint-es5-build": "eslint --no-eslintrc --no-ignore --env=browser packages/*/build-es5",
-    "postinstall": "node ./scripts/postinstall.js && yarn run build --silent && (cd packages/eslint-plugin-jest && yarn link --silent) && yarn link eslint-plugin-jest --silent",
+    "postinstall": "yarn run build --silent",
     "publish": "yarn run build-clean --silent && yarn run build --silent && lerna publish --silent",
     "test-ci-es5-build-in-browser": "karma start --single-run",
     "test-ci": "yarn run typecheck --silent && yarn run lint --silent && yarn run lint-es5-build && yarn run jest-coverage --silent -- -i && yarn run test-examples --silent && node scripts/mapCoverage.js && codecov",
@@ -89,6 +90,9 @@
     "typecheck": "flow check",
     "watch": "yarn run build --silent && node ./scripts/watch.js"
   },
+  "workspaces": [
+    "packages/*"
+  ],
   "jest": {
     "modulePathIgnorePatterns": [
       "examples/.*",