[BUGFIX lts] Fix test issues exposed by not swallowing errors.

Previously, due to always running within a try/catch these errors were
swallowed in production build test runs.

packages/ember-runtime/tests/system/object/create_test.js

@@ -115,9 +115,9 @@ QUnit.test('inherits properties from passed in EmberObject', function() {
 });
 
 QUnit.test('throws if you try to pass anything a string as a parameter', function() {
-  let expected = 'EmberObject.create only accepts an objects.';
+  let expected = 'Ember.Object.create only accepts objects.';
 
-  throws(() => EmberObject.create('some-string'), expected);
+  expectAssertion(() => EmberObject.create('some-string'), expected);
 });
 
 QUnit.test('EmberObject.create can take undefined as a parameter', function() {

packages/ember/tests/helpers/link_to_test/link_to_with_query_params_test.js

@@ -564,7 +564,7 @@ moduleFor('The {{link-to}} helper + query params - globals mode app', class exte
   [`@test the {{link-to}} helper throws a useful error if you invoke it wrong`](assert) {
     assert.expect(1);
 
-    assert.throws(() => {
+    expectAssertion(() => {
       this.runTask(() => {
         this.createApplication();
 
@@ -574,6 +574,6 @@ moduleFor('The {{link-to}} helper + query params - globals mode app', class exte
 
         this.addTemplate('application', `{{#link-to id='the-link'}}Index{{/link-to}}`);
       });
-    }, /(You must provide one or more parameters to the link-to component.|undefined is not an object)/);
+    }, /You must provide one or more parameters to the link-to component/);
   }
-});
+});