Strict and explicit config resolution logic

integration_tests/__tests__/multi_project_runner.test.js

@@ -87,3 +87,82 @@ test('can pass projects or global config', () => {
   expect(result1.summary).toBe(result2.summary);
   expect(sortLines(result1.rest)).toBe(sortLines(result2.rest));
 });
+
+test('resolves projects and their <rootDir> properly', () => {
+  writeFiles(DIR, {
+    '.watchmanconfig': '',
+    'package.json': JSON.stringify({
+      jest: {
+        projects: [
+          'project1.conf.json',
+          '<rootDir>/project2/project2.conf.json',
+        ],
+      },
+    }),
+    'project1.conf.json': JSON.stringify({
+      name: 'project1',
+      rootDir: './project1',
+      // root dir should be this project's directory
+      setupFiles: ['<rootDir>/project1_setup.js'],
+      testEnvironment: 'node',
+    }),
+    'project1/__tests__/test.test.js': `test('project1', () => expect(global.project1).toBe(true))`,
+    'project1/project1_setup.js': 'global.project1 = true;',
+    'project2/__tests__/test.test.js': `test('project2', () => expect(global.project2).toBe(true))`,
+    'project2/project2.conf.json': JSON.stringify({
+      name: 'project2',
+      rootDir: '../', // root dir is set to the top level
+      setupFiles: ['<rootDir>/project2/project2_setup.js'], // rootDir shold be of the
+      testEnvironment: 'node',
+      testPathIgnorePatterns: ['project1'],
+    }),
+    'project2/project2_setup.js': 'global.project2 = true;',
+  });
+
+  let stderr;
+  ({stderr} = runJest(DIR));
+
+  expect(stderr).toMatch('Ran all test suites in 2 projects.');
+  expect(stderr).toMatch(' PASS  project1/__tests__/test.test.js');
+  expect(stderr).toMatch(' PASS  project2/__tests__/test.test.js');
+
+  // Include two projects that will resolve to the same config
+  writeFiles(DIR, {
+    'dir1/random_file': '',
+    'dir2/random_file': '',
+    'package.json': JSON.stringify({
+      jest: {
+        projects: [
+          'dir1',
+          'dir2',
+          'project1.conf.json',
+          '<rootDir>/project2/project2.conf.json',
+        ],
+      },
+    }),
+  });
+
+  ({stderr} = runJest(DIR));
+  expect(stderr).toMatch(
+    /One or more specified projects share the same config file/,
+  );
+
+  // praject with a directory/file that does not exist
+  writeFiles(DIR, {
+    'package.json': JSON.stringify({
+      jest: {
+        projects: [
+          'banana',
+          'project1.conf.json',
+          '<rootDir>/project2/project2.conf.json',
+        ],
+      },
+    }),
+  });
+
+  ({stderr} = runJest(DIR));
+  expect(stderr).toMatch(
+    `Can't find a root directory while resolving a config file path.`,
+  );
+  expect(stderr).toMatch(/banana/);
+});

packages/jest-cli/src/cli/index.js

@@ -153,6 +153,29 @@ const _printVersionAndExit = outputStream => {
   process.exit(0);
 };
 
+const _ensureProjectsDontUseTheSameConfig = (parsedConfigs, projects) => {
+  const configPathSet = new Set();
+
+  for (const {configPath} of parsedConfigs) {
+    if (configPathSet.has(configPath)) {
+      let message =
+        'One or more specified projects share the same config file\n';
+
+      parsedConfigs.forEach(({configPath}, index) => {
+        message =
+          message +
+          '\nProject: "' +
+          projects[index] +
+          '"\nConfig: "' +
+          String(configPath) +
+          '"';
+      });
+      throw new Error(message);
+    }
+    configPathSet.add(configPath);
+  }
+};
+
 // Possible scenarios:
 //  1. jest --config config.json
 //  2. jest --projects p1 p2
@@ -187,7 +210,7 @@ const _getConfigs = (
 
     hasDeprecationWarnings = parsedConfig.hasDeprecationWarnings;
     globalConfig = parsedConfig.globalConfig;
-    configs = [parsedConfig.config];
+    configs = [parsedConfig.projectConfig];
     if (globalConfig.projects && globalConfig.projects.length) {
       // Even though we had one project in CLI args, there might be more
       // projects defined in the config.
@@ -197,7 +220,8 @@ const _getConfigs = (
 
   if (projects.length > 1) {
     const parsedConfigs = projects.map(root => readConfig(argv, root, true));
-    configs = parsedConfigs.map(({config}) => config);
+    _ensureProjectsDontUseTheSameConfig(parsedConfigs, projects);
+    configs = parsedConfigs.map(({projectConfig}) => projectConfig);
     if (!hasDeprecationWarnings) {
       hasDeprecationWarnings = parsedConfigs.some(
         ({hasDeprecationWarnings}) => !!hasDeprecationWarnings,

packages/jest-config/src/__tests__/normalize.test.js

@@ -915,37 +915,3 @@ describe('preset without setupFiles', () => {
     );
   });
 });
-
-describe('projects', () => {
-  beforeEach(() => {
-    jest.resetModules();
-
-    const Resolver = require('jest-resolve');
-    Resolver.findNodeModule = findNodeModule;
-  });
-
-  test('resolves projects correctly', () => {
-    const root = '/path/to/test';
-    const glob = require('glob');
-    glob.sync = jest.fn(
-      pattern =>
-        pattern.indexOf('/examples/') !== -1
-          ? [root + '/examples/async', root + '/examples/snapshot']
-          : [pattern],
-    );
-    const normalize = require('../normalize');
-    const {options} = normalize(
-      {
-        projects: ['<rootDir>', '<rootDir>/examples/*'],
-        rootDir: root,
-      },
-      {},
-    );
-
-    expect(options.projects).toEqual([
-      root,
-      root + '/examples/async',
-      root + '/examples/snapshot',
-    ]);
-  });
-});

packages/jest-config/src/__tests__/resolve_config_path.test.js

@@ -0,0 +1,92 @@
+/**
+ * Copyright (c) 2014-present, 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.
+ *
+ */
+
+import {cleanup, writeFiles} from '../../../../integration_tests/utils';
+import os from 'os';
+import path from 'path';
+import resolveConfigPath from '../resolve_config_path';
+
+const DIR = path.resolve(os.tmpdir(), 'resolve_config_path_test');
+const ERROR_PATTERN = /Could not find a config file based on provided values/;
+const NO_ROOT_DIR_ERROR_PATTERN = /Can\'t find a root directory/;
+
+beforeEach(() => cleanup(DIR));
+afterEach(() => cleanup(DIR));
+
+test('file path', () => {
+  const relativeConfigPath = 'a/b/c/my_config.js';
+  const absoluteConfigPath = path.resolve(DIR, relativeConfigPath);
+
+  writeFiles(DIR, {[relativeConfigPath]: ''});
+
+  // absolute
+  expect(resolveConfigPath(absoluteConfigPath, DIR)).toBe(absoluteConfigPath);
+  expect(() => resolveConfigPath('/does_not_exist', DIR)).toThrowError(
+    NO_ROOT_DIR_ERROR_PATTERN,
+  );
+
+  // relative
+  expect(resolveConfigPath(relativeConfigPath, DIR)).toBe(absoluteConfigPath);
+  expect(() => resolveConfigPath('does_not_exist', DIR)).toThrowError(
+    NO_ROOT_DIR_ERROR_PATTERN,
+  );
+});
+
+test('directory path', () => {
+  const relativePackageJsonPath = 'a/b/c/package.json';
+  const absolutePackageJsonPath = path.resolve(DIR, relativePackageJsonPath);
+  const relativeJestConfigPath = 'a/b/c/jest.config.js';
+  const absoluteJestConfigPath = path.resolve(DIR, relativeJestConfigPath);
+
+  writeFiles(DIR, {'a/b/c/some_random_file.js': ''});
+
+  // no configs yet. should throw
+  expect(() =>
+    // absolute
+    resolveConfigPath(path.dirname(absoluteJestConfigPath), DIR),
+  ).toThrowError(ERROR_PATTERN);
+
+  expect(() =>
+    // relative
+    resolveConfigPath(path.dirname(relativeJestConfigPath), DIR),
+  ).toThrowError(ERROR_PATTERN);
+
+  writeFiles(DIR, {[relativePackageJsonPath]: ''});
+
+  // absolute
+  expect(resolveConfigPath(path.dirname(absolutePackageJsonPath), DIR)).toBe(
+    absolutePackageJsonPath,
+  );
+
+  // relative
+  expect(resolveConfigPath(path.dirname(relativePackageJsonPath), DIR)).toBe(
+    absolutePackageJsonPath,
+  );
+
+  writeFiles(DIR, {[relativeJestConfigPath]: ''});
+
+  // jest.config.js takes presedence
+
+  // absolute
+  expect(resolveConfigPath(path.dirname(absolutePackageJsonPath), DIR)).toBe(
+    absoluteJestConfigPath,
+  );
+
+  // relative
+  expect(resolveConfigPath(path.dirname(relativePackageJsonPath), DIR)).toBe(
+    absoluteJestConfigPath,
+  );
+
+  expect(() => {
+    resolveConfigPath(
+      path.join(path.dirname(relativePackageJsonPath), 'j/x/b/m/'),
+      DIR,
+    );
+  }).toThrowError(NO_ROOT_DIR_ERROR_PATTERN);
+});

packages/jest-config/src/constants.js

@@ -13,3 +13,5 @@ import path from 'path';
 exports.NODE_MODULES = path.sep + 'node_modules' + path.sep;
 exports.DEFAULT_JS_PATTERN = '^.+\\.jsx?$';
 exports.DEFAULT_REPORTER_LABEL = 'default';
+exports.PACKAGE_JSON = 'package.json';
+exports.JEST_CONFIG = 'jest.config.js';