add tests for components and refactor test fixtures to not register all components as a side-effect

src/scripts/components/submit.js

@@ -5,6 +5,7 @@ module.exports = {
   template: require('../../templates/components/submit.tpl'),
   manipulator: 'val',
   defaults: {
+    label: '',
     attributes: {}
   }
 };

src/scripts/components/toggle.js

@@ -6,6 +6,7 @@ module.exports = {
   style: require('../../styles/clay/components/toggle.scss'),
   manipulator: 'checked',
   defaults: {
+    label: '',
     attributes: {}
   }
 };