add tests

tests/acceptance/scroll-operator-test.js

@@ -0,0 +1,102 @@
+import Ember from 'ember';
+import { test } from 'qunit';
+import moduleForAcceptance from '../../tests/helpers/module-for-acceptance';
+
+moduleForAcceptance('Acceptance | scroll operator');
+
+/**
+ * This test is seemingly impossible right now. Unable to successfully emulate
+ * hitting the browser back/forward button due to acceptance tests using
+ * locationType 'none'. Setting to 'hash' does not seem to help. Need to
+ * revisit.
+ *
+ * test('scroll operator works', function(assert) {
+ *   // Configure location type to simulate browser back button
+ *   this.application.Router.reopen({
+ *     location: 'hash',
+ *   });
+
+ *   const viewportHeight = Ember.$(window).height();
+ *   const testScrollTop = viewportHeight + 5;
+ *
+ *   visit('/').then(() => {
+ *     // Modify page to have scrollable content
+ *     const tallDiv = Ember.$('<div></div>').css({ height: viewportHeight * 2 });
+ *     Ember.$(document.body).append(tallDiv);
+
+ *     // scroll to a position
+ *     Ember.$(window).scrollTop(testScrollTop);
+ *   });
+
+ *
+ *   // navigate away from page and change scrollTop
+ *   visit('/route-a').then(() => {
+ *     Ember.$(window).scrollTop(0);
+ *   });
+ *
+ *   // use browser's native back functionality to navigate to previous route
+ *   //window.history.back();
+ *   visit('/');
+ *
+ *   // assert that previous position is preserved
+ *   andThen(function() {
+ *     assert.equal(currentURL(), '/');
+ *     assert.equal(Ember.$(window).scrollTop(), testScrollTop);
+ *   });
+ * });
+ **/
+
+test('scroll operator does not resume scroll for non-browser triggered transitions', function(assert) {
+  // get viewport height
+  const viewportHeight = Ember.$(window).height();
+
+  // create arbitrary scrollTo value
+  const testScrollTop = viewportHeight + 5;
+
+  visit('/').then(() => {
+    // create and append div of 'tall' height
+    const tallDiv = Ember.$('<div></div>').css({ height: viewportHeight * 2 });
+    Ember.$(document.body).append(tallDiv);
+
+    // scroll to a position
+    Ember.$(window).scrollTop(testScrollTop);
+  });
+
+  // navigate away from page and ensure scroll
+  visit('/route-a').then(() => {
+    Ember.$(window).scrollTop(testScrollTop);
+  });
+
+  // visit index via app
+  visit('/');
+
+  // assert that previous position is reset (equal to 0)
+  andThen(function() {
+    assert.equal(currentURL(), '/');
+    assert.equal(Ember.$(window).scrollTop(), 0);
+  });
+});
+
+test('reset scroll will reset scroll position to 0', function(assert) {
+  visit('/').then(() => {
+    // get viewport height
+    const viewportHeight = Ember.$(window).height();
+
+    // create arbitrary scrollTo value
+    const testScrollTop = viewportHeight + 5;
+
+    // create and append div of 'tall' height
+    const tallDiv = Ember.$('<div></div>').css({ height: viewportHeight * 2 });
+    Ember.$(document.body).append(tallDiv);
+
+    // scroll to a position
+    Ember.$(window).scrollTop(testScrollTop);
+  });
+
+  visit('/reset-route');
+
+  andThen(function() {
+    assert.equal(currentURL(), '/reset-route');
+    assert.equal(Ember.$(window).scrollTop(), 0);
+  });
+});

tests/dummy/app/router.js

@@ -6,6 +6,8 @@ const Router = Ember.Router.extend({
 });
 
 Router.map(function() {
+  this.route('route-a');
+  this.route('reset-route');
 });
 
 export default Router;

tests/dummy/app/routes/index.js

@@ -0,0 +1,4 @@
+import Ember from 'ember';
+import ScrollOperatorMixin from 'ember-scroll-operator/mixins/scroll-operator';
+
+export default Ember.Route.extend(ScrollOperatorMixin);

tests/dummy/app/routes/reset-route.js

@@ -0,0 +1,4 @@
+import Ember from 'ember';
+import ResetScrollMixin from 'ember-scroll-operator/mixins/reset-scroll';
+
+export default Ember.Route.extend(ResetScrollMixin);

tests/dummy/app/routes/route-a.js

@@ -0,0 +1,3 @@
+import Ember from 'ember';
+
+export default Ember.Route.extend();

tests/dummy/config/environment.js

@@ -5,7 +5,7 @@ module.exports = function(environment) {
     modulePrefix: 'dummy',
     environment: environment,
     baseURL: '/',
-    locationType: 'auto',
+    locationType: 'hash',
     EmberENV: {
       FEATURES: {
         // Here you can enable experimental features on an ember canary build