Do not register a router service for Ember <1.13

Versions of Ember prior to 1.13 require a full router booted by the app,
or no router at all. This ensures they receive no router at all instead
of the 1.13-safe one.

lib/ember-test-helpers/test-module.js

@@ -4,6 +4,13 @@ import { Klass } from 'klassy';
 import { getResolver } from './test-resolver';
 import buildRegistry from './build-registry';
 
+function hasEmberVersion(major, minor) {
+  var numbers = Ember.VERSION.split('-')[0].split('.');
+  var actualMajor = parseInt(numbers[0], 10);
+  var actualMinor = parseInt(numbers[1], 10);
+  return actualMajor > major || (actualMajor === major && actualMinor >= minor);
+}
+
 export default Klass.extend({
   init: function(subjectName, description, callbacks) {
     // Allow `description` to be omitted, in which case it should
@@ -234,10 +241,12 @@ export default Klass.extend({
     this.container = items.container;
     this.registry = items.registry;
 
-    var thingToRegisterWith = this.registry || this.container;
-    var router = resolver.resolve('router:main');
-    router = router || Ember.Router.extend();
-    thingToRegisterWith.register('router:main', router);
+    if (hasEmberVersion(1, 13)) {
+      var thingToRegisterWith = this.registry || this.container;
+      var router = resolver.resolve('router:main');
+      router = router || Ember.Router.extend();
+      thingToRegisterWith.register('router:main', router);
+    }
   },
 
   _setupIsolatedContainer: function() {

tests/test-module-for-integration-test.js

@@ -26,6 +26,11 @@ test('it can render a template', function() {
   equal(this.$('span').text(), 'Hello');
 });
 
+test('it can render a link-to', function() {
+  this.render("{{link-to 'Hi' 'index'}}");
+  ok(true, 'it renders without fail');
+});
+
 test('it complains if you try to use bare render', function() {
   var self = this;
   throws(function() {