unittest: big cleanup, tightened test semantics

tests/lib/json/json_test.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library json_tests;
 import 'package:unittest/unittest.dart';
 import 'dart:json' as json;
 
 main() {
   test('Parse', () {
@@ skipping 49 matching lines @@
 
     expect(json.parse(' {"x":3, "y": -4.5,  "z" : "hi",'
                    '"w":null, "u" : true, "v": false } '),
         equals({"x":3, "y": -4.5,  "z" : "hi",
                    "w":null, "u" : true, "v": false }));
 
     expect(json.parse('{"x": {"a":3, "b": -4.5}, "y":[{}], '
                    '"z":"hi","w":{"c":null,"d":true}, "v":null}'),
         equals({"x": {"a":3, "b": -4.5}, "y":[{}],
                    "z":"hi","w":{"c":null,"d":true}, "v":null}));
+  });
 
   test('stringify', () {
     // Scalars.
     expect(json.stringify(5), equals('5'));
     expect(json.stringify(-42), equals('-42'));
     // Dart does not guarantee a formatting for doubles,
     // so reparse and compare to the original.
     validateRoundTrip(3.14);
     expect(json.stringify(true), equals('true'));
     expect(json.stringify(false), equals('false'));
@@ skipping 43 matching lines @@
     }, throwsJsonError);
 
   });
 
   test('stringify throws if argument cannot be converted', () {
     /**
      * Checks that we get an exception (rather than silently returning null) if
      * we try to stringify something that cannot be converted to json.
      */
     expect(() => json.stringify(new TestClass()), throwsJsonError);
-    });
   });
 
   test('stringify throws if toJson throws', () {
     expect(() => json.stringify(new ToJsoner("bad", throws: true)),
            throwsJsonError);
   });
 
   test('stringify throws if toJson returns non-serializable value', () {
     expect(() => json.stringify(new ToJsoner(new TestClass())),
            throwsJsonError);
@@ skipping 36 matching lines @@
 var throwsJsonError =
     throwsA(new isInstanceOf<json.JsonUnsupportedObjectError>());
 
 /**
  * Checks that the argument can be converted to a JSON string and
  * back, and produce something equivalent to the argument.
  */
 validateRoundTrip(expected) {
   expect(json.parse(json.stringify(expected)), equals(expected));
 }