diff --git a/integration_tests/__tests__/__snapshots__/moduleNameMapper-test.js.snap b/integration_tests/__tests__/__snapshots__/moduleNameMapper-test.js.snap
index cd38a0ca018c..d1ffd71395e0 100644
--- a/integration_tests/__tests__/__snapshots__/moduleNameMapper-test.js.snap
+++ b/integration_tests/__tests__/__snapshots__/moduleNameMapper-test.js.snap
@@ -14,12 +14,12 @@ exports[`moduleNameMapper wrong configuration 1`] = `
     Configuration error:
     
     Unknown module in configuration option moduleNameMapper
-    Please check: /\\\\.(css|less)$/: module-that-dont-exist
+    Please check: /\\\\.(css|less)$/: no-such-module
     
       Configuration error:
       
       Unknown module in configuration option moduleNameMapper
-      Please check: /\\\\.(css|less)$/: module-that-dont-exist
+      Please check: /\\\\.(css|less)$/: no-such-module
       
 
 "
diff --git a/integration_tests/__tests__/moduleNameMapper-test.js b/integration_tests/__tests__/moduleNameMapper-test.js
index eb6990fdfece..15ce6945a28c 100644
--- a/integration_tests/__tests__/moduleNameMapper-test.js
+++ b/integration_tests/__tests__/moduleNameMapper-test.js
@@ -1,3 +1,11 @@
+/**
+ * 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.
+ */
+
 const runJest = require('../runJest');
 const {extractSummary} = require('../utils');
 
diff --git a/integration_tests/moduleNameMapper-correct-config/index.js b/integration_tests/moduleNameMapper-correct-config/index.js
index 1e0a57ed1a89..5e8877f2bd53 100644
--- a/integration_tests/moduleNameMapper-correct-config/index.js
+++ b/integration_tests/moduleNameMapper-correct-config/index.js
@@ -8,6 +8,5 @@
  */
 
 'use strict';
-// Inlcude style so moduleNameMapping triggers
 require('./style.css');
 module.exports = () => 'test';
diff --git a/integration_tests/moduleNameMapper-correct-config/package.json b/integration_tests/moduleNameMapper-correct-config/package.json
index 7acd3480d04e..bae54df851fe 100644
--- a/integration_tests/moduleNameMapper-correct-config/package.json
+++ b/integration_tests/moduleNameMapper-correct-config/package.json
@@ -1,7 +1,7 @@
 {
-    "jest": {
-        "moduleNameMapper": {
-                "\\.(css|less)$": "./__mocks__/styleMock.js"
-        }
+  "jest": {
+    "moduleNameMapper": {
+      "\\.(css|less)$": "./__mocks__/styleMock.js"
     }
+  }
 }
diff --git a/integration_tests/moduleNameMapper-wrong-config/index.js b/integration_tests/moduleNameMapper-wrong-config/index.js
index e545da434421..677b56bb752b 100644
--- a/integration_tests/moduleNameMapper-wrong-config/index.js
+++ b/integration_tests/moduleNameMapper-wrong-config/index.js
@@ -8,6 +8,5 @@
  */
 
 'use strict';
-// Inlcude style so moduleNameMapping triggers
 require('./style.css');
 module.exports = () => 'test';
diff --git a/integration_tests/moduleNameMapper-wrong-config/package.json b/integration_tests/moduleNameMapper-wrong-config/package.json
index 4c4c4f63af0d..59634293724b 100644
--- a/integration_tests/moduleNameMapper-wrong-config/package.json
+++ b/integration_tests/moduleNameMapper-wrong-config/package.json
@@ -1,7 +1,7 @@
 {
-    "jest": {
-        "moduleNameMapper": {
-                "\\.(css|less)$": "module-that-dont-exist"
-        }
+  "jest": {
+    "moduleNameMapper": {
+      "\\.(css|less)$": "no-such-module"
     }
+  }
 }
diff --git a/packages/jest-resolve/package.json b/packages/jest-resolve/package.json
index 783d7be7f7f9..6ce1556b699e 100644
--- a/packages/jest-resolve/package.json
+++ b/packages/jest-resolve/package.json
@@ -11,6 +11,7 @@
     "browser-resolve": "^1.11.2",
     "chalk": "^1.1.3",
     "is-builtin-module": "^1.0.0",
+    "jest-validate": "^20.0.1",
     "resolve": "^1.3.2"
   },
   "devDependencies": {