Add ability to specify envs to strip selectors.

For example, removing the test selectors in a staging or other pre-production environment.

CHANGELOG.md

@@ -1,3 +1,7 @@
+# Unreleased
+
+* `environments` configuration option.
+
 # 0.0.2
 
 * Add the `testSelector` test helper that makes generating `data` attribute

README.md

@@ -93,6 +93,25 @@ delivered__:
 </article>
 ```
 
+## Configuartion
+To modify the default configuration, place a block called `ember-test-selectors`
+in your `ember-cli-build.js` file.
+
+### Options
+
+`environments`
+Defines the environments in which you want the test selectors to be removed.
+By default, selectors are only removed in the `production` environment. You
+might also want to remove them in other staging environments for testing.
+
+```javascript
+var app = new EmberApp({
+  'ember-test-selectors': {
+    environments: ['production', 'staging']
+  }
+});
+```
+
 ## Test Helpers
 
 `ember-test-selectors` comes with a test helper that can be used in acceptance

index.js

@@ -1,14 +1,20 @@
 /*jshint node:true*/
-var StringTestSelectorsTransform = require('./strip-test-selectors');
+var _includes = require('lodash/includes');
 
 module.exports = {
   name: 'test-selectors',
 
-  included: function() {
-    if (this.app.env === 'production') {
-      this.app.registry.add('htmlbars-ast-plugin', {
+  setupPreprocessorRegistry: function(type, registry) {
+    var appOptions = registry.app.options || {};
+    var addonOptions = appOptions['ember-test-selectors'] || {};
+    var environments = addonOptions.environments || ['production'];
+
+    if (_includes(environments, registry.app.env)) {
+      var StripTestSelectorsTransform = require('./strip-test-selectors');
+
+      registry.add('htmlbars-ast-plugin', {
         name: 'strip-test-selectors',
-        plugin: StringTestSelectorsTransform
+        plugin: StripTestSelectorsTransform
       });
     }
   }