ES6: Convert all test files over

test/javascripts/mixins/singleton-test.js.es6

@@ -0,0 +1,61 @@
+module("Discourse.Singleton");
+
+test("current", function() {
+  var DummyModel = Ember.Object.extend({});
+  DummyModel.reopenClass(Discourse.Singleton);
+
+  var current = DummyModel.current();
+  present(current, 'current returns the current instance');
+  equal(current, DummyModel.current(), 'calling it again returns the same instance');
+  notEqual(current, DummyModel.create({}), 'we can create other instances that are not the same as current');
+});
+
+test("currentProp reading", function() {
+  var DummyModel = Ember.Object.extend({});
+  DummyModel.reopenClass(Discourse.Singleton);
+  var current = DummyModel.current();
+
+  blank(DummyModel.currentProp('evil'), 'by default attributes are blank');
+  current.set('evil', 'trout');
+  equal(DummyModel.currentProp('evil'), 'trout', 'after changing the instance, the value is set');
+});
+
+test("currentProp writing", function() {
+  var DummyModel = Ember.Object.extend({});
+  DummyModel.reopenClass(Discourse.Singleton);
+
+  blank(DummyModel.currentProp('adventure'), 'by default attributes are blank');
+  var result = DummyModel.currentProp('adventure', 'time');
+  equal(result, 'time', 'it returns the new value');
+  equal(DummyModel.currentProp('adventure'), 'time', 'after calling currentProp the value is set');
+
+  DummyModel.currentProp('count', 0);
+  equal(DummyModel.currentProp('count'), 0, 'we can set the value to 0');
+
+  DummyModel.currentProp('adventure', null);
+  equal(DummyModel.currentProp('adventure'), null, 'we can set the value to null');
+});
+
+test("createCurrent", function() {
+  var Shoe = Ember.Object.extend({});
+  Shoe.reopenClass(Discourse.Singleton, {
+    createCurrent: function() {
+      return Shoe.create({toes: 5});
+    }
+  });
+
+  equal(Shoe.currentProp('toes'), 5, 'it created the class using `createCurrent`');
+});
+
+
+test("createCurrent that returns null", function() {
+  var Missing = Ember.Object.extend({});
+  Missing.reopenClass(Discourse.Singleton, {
+    createCurrent: function() {
+      return null;
+    }
+  });
+
+  blank(Missing.current(), "it doesn't return an instance");
+  blank(Missing.currentProp('madeup'), "it won't raise an error asking for a property. Will just return null.");
+});