move mixin to standard location & add allowUnload

 - Use the standard conventional location for ember-cli addon mixins.
 - Wrap "allow" logic into an overrideable method `allowUnload`

addon/confirmation.js → addon/mixins/confirmation.js

@@ -60,11 +60,15 @@ export default Mixin.create({
     return msg;
   },
 
+  allowUnload(transition) {
+    return transition.targetName.indexOf(this.routeName + '.') === 0;
+  },
+
   actions: {
     willTransition(transition) {
 			this._super(...arguments);
 
-      let allow = transition.targetName.indexOf(this.routeName + '.') === 0;
+      const allow = this.allowUnload(transition);
 
       if (!allow && this.canUnload()) {
         const msg = this.readConfirmation();

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ember-onbeforeunload",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "description": "An addon to conditionally prompt the user when transitioning between routes or closing the browser.",
   "directories": {
     "doc": "doc",

tests/dummy/app/routes/foo.js

@@ -1,5 +1,5 @@
 import Ember from 'ember';
-import ConfirmationMixin from 'ember-onbeforeunload/confirmation';
+import ConfirmationMixin from 'ember-onbeforeunload/mixins/confirmation';
 
 export default Ember.Route.extend(ConfirmationMixin, {
 	model() {

tests/unit/mixins/confirmation-test.js

@@ -0,0 +1,12 @@
+import Ember from 'ember';
+import ConfirmationMixin from 'ember-onbeforeunload/mixins/confirmation';
+import { module, test } from 'qunit';
+
+module('Unit | Mixin | confirmation');
+
+// Replace this with your real tests.
+test('it works', function(assert) {
+  let ConfirmationObject = Ember.Object.extend(ConfirmationMixin);
+  let subject = ConfirmationObject.create();
+  assert.ok(subject);
+});