Use mockery in tests to setup the realm module path(#727)

* Use mockery to set up the realm module path

* Use the right path

* Add mockery to devDependencies

* Remove unnecessary symbolic link

package.json

@@ -66,6 +66,7 @@
     "eslint-plugin-jasmine": "^2.1.0",
     "eslint-plugin-react": "^6.7.0",
     "jsdoc": "^3.4.0",
+    "mockery": "^2.0.0",
     "semver": "^5.1.0"
   },
   "rnpm": {

tests/js/async-tests.js

@@ -29,7 +29,7 @@ function createNotificationTest(config, getObservable, addListener, removeListen
     return new Promise((resolve, reject) => {
         let realm = new Realm(config);
         let observable = getObservable(realm);
-        let worker = new Worker(__dirname + '/worker-tests-script.js', [require.resolve('realm')]);
+        let worker = new Worker(__dirname + '/worker-tests-script.js', [REALM_MODULE_PATH]);
 
         // Test will fail if it does not receive a change event within a second.
         let timer = setTimeout(() => {

tests/package.json

@@ -15,7 +15,6 @@
   "scripts": {
     "test": "jasmine spec/unit_tests.js spec/sync_tests.js",
     "test-nosync": "jasmine spec/unit_tests.js",
-    "test-sync-integration": "jasmine spec/sync_integration_tests.js",
-    "postinstall": "rm -f node_modules/realm && ln -s ../.. node_modules/realm"
+    "test-sync-integration": "jasmine spec/sync_integration_tests.js"
   }
 }

tests/spec/helpers/mock_realm.js

@@ -0,0 +1,16 @@
+'use strict';
+
+const mockery = require('mockery');
+
+module.exports = function(realmModulePath) {
+    if (typeof REALM_MODULE_PATH !== 'undefined')
+        return;
+
+    global.REALM_MODULE_PATH = realmModulePath;
+
+    mockery.enable({
+        warnOnReplace: false,
+        warnOnUnregistered: false
+    });
+    mockery.registerSubstitute('realm', REALM_MODULE_PATH);
+}

tests/spec/helpers/setup-module-path.js

@@ -0,0 +1,4 @@
+const mock_helper = require('./mock_realm')
+const path = require('path');
+
+mock_helper(path.resolve(__dirname, '../../..'))