Format all tests.

tests/html/hidden_dom_2_test.dart

 library HiddenDom2Test;
+
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';
 import 'dart:html';
 
 // Test that the dart:html API does not leak native jsdom methods:
 //   appendChild operation.
 
 main() {
   useHtmlConfiguration();
 
   test('test1', () {
     document.body.children.add(new Element.html(r'''
 <div id='div1'>
 Hello World!
 </div>'''));
     Element e = document.query('#div1');
     Element e2 = new Element.html(r"<div id='xx'>XX</div>");
     expect(e, isNotNull);
 
-    checkNoSuchMethod(() { confuse(e).appendChild(e2); });
-
+    checkNoSuchMethod(() {
+      confuse(e).appendChild(e2);
+    });
   });
 }
 
 class Decoy {
-  void appendChild(x) { throw 'dead code'; }
+  void appendChild(x) {
+    throw 'dead code';
+  }
 }
 
 confuse(x) => opaqueTrue() ? x : (opaqueTrue() ? new Object() : new Decoy());
 
 /** Returns [:true:], but in a way that confuses the compiler. */
-opaqueTrue() => true;  // Expand as needed.
+opaqueTrue() => true; // Expand as needed.
 
 checkNoSuchMethod(action()) {
   var ex = null;
   bool threw = false;
   try {
     action();
   } catch (e) {
     threw = true;
     ex = e;
   }
   if (!threw)
     expect(false, isTrue, reason: 'Action should have thrown exception');
 
   expect(ex, isNoSuchMethodError);
 }