clean up and fix tests

test/fixtures/transformation/classes/constructor/expected.js

@@ -1,12 +1,14 @@
 "use strict";
 
 var _extends = function (child, parent) {
-  child.prototype = Object.create(parent.prototype, { constructor: {
-    value: child,
-    enumerable: false,
-    writable: true,
-    configurable: true
-  } });
+  child.prototype = Object.create(parent.prototype, {
+    constructor: {
+      value: child,
+      enumerable: false,
+      writable: true,
+      configurable: true
+    }
+  });
   child.__proto__ = parent;
 };
 
@@ -22,4 +24,4 @@ var Foo = (function (Bar) {
   _extends(Foo, Bar);
 
   return Foo;
-})(Bar);
+})(Bar);