Add failing test for native module re-requires.

package.json

@@ -26,7 +26,7 @@
   "license": "MIT",
   "scripts": {
     "pretest": "eslint benchmarks lib test",
-    "test": "mocha --recursive test",
+    "test": "mocha --recursive -r native-module/hello test",
     "bench": "bench benchmarks"
   },
   "devDependencies": {
@@ -35,6 +35,7 @@
     "eslint": "2.13.0",
     "eslint-config-tschaub": "6.0.0",
     "fs-extra": "^0.30.0",
+    "native-module": "^0.11.3",
     "mocha": "3.1.2",
     "rimraf": "2.5.4"
   },

test/integration/native-module-require.spec.js

@@ -0,0 +1,10 @@
+/**
+ * native-module MUST have been pre-required by mocha in order for this test to
+ * fail properly.
+ */
+describe('native module re-requires', function() {
+  it('should work', function() {
+    require('../../lib/index');
+    require('native-module/hello');
+  });
+});