Fix NODE_PATH resolving for relative paths

integration_tests/__tests__/node_path-test.js

@@ -0,0 +1,19 @@
+/**
+ * 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.
+ *
+ * @emails oncall+jsinfra
+ */
+'use strict';
+
+const runJest = require('../runJest');
+
+test('supports NODE_PATH', () => {
+  const result = runJest('node_path', [], {
+    nodePath: ['../node_path/src'],
+  });
+  expect(result.status).toBe(0);
+});

integration_tests/node_path/__tests__/node_path-test.js

@@ -0,0 +1,12 @@
+/**
+ * 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.
+ */
+'use strict';
+
+test('can require by absolute path', () => {
+  expect(require('path/file.js')).toBe(42);
+});

integration_tests/node_path/package.json

@@ -0,0 +1,8 @@
+{
+  "jest": {
+    "testEnvironment": "node",
+    "transform": {
+      "^.+\\.jsx?$": "../../packages/babel-jest"
+    }
+  }
+}

integration_tests/node_path/src/path/file.js

@@ -0,0 +1,10 @@
+/**
+ * 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.
+ */
+'use strict';
+
+module.exports = 42;

integration_tests/runJest.js

@@ -17,6 +17,7 @@ const JEST_PATH = path.resolve(__dirname, '../packages/jest-cli/bin/jest.js');
 
 type RunJestOptions = {
   skipPkgJsonCheck?: boolean, // don't complain if can't find package.json
+  nodePath?: string,
 };
 
 // return the result of the spawned process:
@@ -45,7 +46,15 @@ function runJest(
     );
   }
 
-  const result = spawnSync(JEST_PATH, args || [], {cwd: dir});
+  const env = options.nodePath
+    ? Object.assign({}, process.env, {
+        NODE_PATH: options.nodePath,
+      })
+    : process.env;
+  const result = spawnSync(JEST_PATH, args || [], {
+    cwd: dir,
+    env,
+  });
 
   result.stdout = result.stdout && result.stdout.toString();
   result.stderr = result.stderr && result.stderr.toString();

packages/jest-resolve/src/index.js

@@ -11,6 +11,7 @@
 import type {Path} from 'types/Config';
 import type {ModuleMap} from 'types/HasteMap';
 
+const fs = require('fs');
 const path = require('path');
 const nodeModulesPaths = require('resolve/lib/node-modules-paths');
 const isBuiltinModule = require('is-builtin-module');
@@ -49,8 +50,13 @@ export type ResolveModuleConfig = {|
 
 const NATIVE_PLATFORM = 'native';
 
+// We might be inside a symlink.
+const resolvedCwd = fs.realpathSync(process.cwd());
 const nodePaths = process.env.NODE_PATH
-  ? process.env.NODE_PATH.split(path.delimiter)
+  ? process.env.NODE_PATH
+      .split(path.delimiter)
+      // The resolver expects absolute paths.
+      .map(p => path.resolve(resolvedCwd, p))
   : null;
 
 class Resolver {