collect coverage for jest itself (jestjs#1362)

.gitignore

@@ -16,3 +16,4 @@ website/src/jest/docs
 website/src/jest/blog
 lerna-debug.log
 npm-debug.log*
+coverage

.travis.yml

@@ -4,3 +4,5 @@ node_js:
   - "6"
 sudo: false
 before_install: npm i -g npm@latest
+script:
+  - npm run test-ci

package.json

@@ -14,6 +14,8 @@
     "flow-bin": "^0.29.0",
     "glob": "^7.0.4",
     "graceful-fs": "^4.1.4",
+    "istanbul-api": "^1.0.0-aplha.10",
+    "istanbul-lib-coverage": "^1.0.0-alpha.4",
     "lerna": "2.0.0-beta.24",
     "minimatch": "^3.0.2",
     "mkdirp": "^0.5.1",
@@ -29,6 +31,8 @@
     "publish": "npm run build-clean && npm run build && lerna publish",
     "test-examples": "node ./scripts/test_examples.js",
     "test": "npm run typecheck && npm run lint && npm run build && npm run jest && npm run test-examples",
+    "test-coverage": "./packages/jest-cli/bin/jest.js --coverage && node ./scripts/mapCoverage",
+    "test-ci": "npm run typecheck && npm run lint && npm run jest -- --runInBand --coverage && node ./scripts/mapCoverage",
     "jest": "./packages/jest-cli/bin/jest.js",
     "typecheck": "flow check",
     "watch": "npm run build; node ./scripts/watch.js"
@@ -40,14 +44,22 @@
       "packages\/.*\/build"
     ],
     "rootDir": "./",
+    "collectCoverageFrom": [
+      "**/packages/**/*.js",
+      "!**/vendor/**",
+      "!**/__mocks__/**",
+      "!**/__tests__/**",
+      "!integration_tests/**"
+    ],
+    "coverageReporters": ["json"],
     "scriptPreprocessor": "<rootDir>/packages/babel-jest",
     "setupTestFrameworkScriptFile": "<rootDir>/testSetupFile.js",
     "testPathIgnorePatterns": [
       "/node_modules/",
       "/examples/",
-      "integration_tests\/.*\/__tests__",
+      "integration_tests/.*/__tests__",
       "\\.snap$",
-      "packages\/.*\/build"
+      "packages/.*/build"
     ],
     "testRegex": ".*-test.\\js"
   }

packages/jest-jasmine2/src/__tests__/reporter-test.js

@@ -11,13 +11,13 @@
 
 jest.disableAutomock();
 
+const JasmineReporter = require('../reporter');
+
 describe('Jasmine2Reporter', () => {
-  let JasmineReporter;
   let chalk;
   let reporter;
 
   beforeEach(() => {
-    JasmineReporter = require('../reporter');
     chalk = require('chalk');
 
     reporter = new JasmineReporter({});

scripts/mapCoverage.js

@@ -0,0 +1,49 @@
+/**
+ * Copyright (c) 2014, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+'use strict';
+
+/**
+ * Because we have a build step, sometimes we can test files from both
+ * `packages/jest-whatever/build/*` and `packages/jest-whatever/src/*`
+ *
+ * If we require file by its relative path like:
+ *    // inside `jest-whatever/src/__tests__/index.js`
+ *    require('../index.js'); // this will require `jest-whatever/src/index.js`
+ *
+ * But if we require it by a package name, this will go through node_modules
+ * and lerna index.js link. So the actual file will be required from `build/`
+ *    // inside another packages
+ *    // this will go through lerna and require `jest-whatever/build/index.js
+ *    require('jest-whatever')
+ *
+ * these files are identical (one is preprocessed, another is transformed on
+ * the fly), but the coverage paths are different.
+ * This script will map coverage results from both locations to one and
+ * produce a full coverage report.
+ */
+
+const createReporter = require('istanbul-api').createReporter;
+const coverage = require('../coverage/coverage-final.json');
+const istanbulCoverage = require('istanbul-lib-coverage');
+
+const map = istanbulCoverage.createCoverageMap();
+const reporter = createReporter();
+
+const mapFileCoverage = fileCoverage => {
+  fileCoverage.path = fileCoverage.path
+    .replace(/(.*packages\/.*\/)(build)(\/.*)/, '$1src$3');
+  return fileCoverage;
+};
+
+Object.keys(coverage).forEach(
+  filename => map.addFileCoverage(mapFileCoverage(coverage[filename]))
+);
+
+reporter.addAll(['json', 'lcov', 'text']);
+reporter.write(map);