Adds repro steps for positional params (working now)

tests/dummy/app/components/positional-params.js

@@ -0,0 +1,13 @@
+import Ember from 'ember';
+import layout from '../templates/components/positional-params';
+
+const PositionalParamsComponent = Ember.Component.extend({
+  layout,
+  x: 2,
+  y: 3,
+  z: 4
+});
+PositionalParamsComponent.reopenClass({
+  positionalParams: ['x', 'y', 'z']
+});
+export default PositionalParamsComponent;

tests/dummy/app/templates/application.hbs

@@ -34,3 +34,9 @@ JS Only pod:
 {{#hot-replacement-component baseComponentName="template-only-pod"}}
   {{template-only-pod}}
 {{/hot-replacement-component}}
+<h2>positional-params</h2>
+{{#hot-replacement-component baseComponentName="positional-params"}}
+  {{#positional-params 1}}
+    From yielded block
+  {{/positional-params}}
+{{/hot-replacement-component}}

tests/dummy/app/templates/components/positional-params.hbs

@@ -0,0 +1,3 @@
+{{x}}-{{y}}-{{z}}
+
+{{yield}}