lib/convert: removed unused import, removed redundant test

tests/lib/convert/json2_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 json2_tests;
-
-import "dart:convert";
-
-import 'package:unittest/unittest.dart';
-
-// Moved from "tests/json/json_test.dart"
-
-void main() {
-  test('Parse', () {
-    // Scalars.
-    expect(JSON.decode(' 5 '), equals(5));
-    expect(JSON.decode(' -42 '), equals(-42));
-    expect(JSON.decode(' 3e0 '), equals(3));
-    expect(JSON.decode(' 3.14 '), equals(3.14));
-    expect(JSON.decode('true '), isTrue);
-    expect(JSON.decode(' false'), isFalse);
-    expect(JSON.decode(' null '), isNull);
-    expect(JSON.decode('\n\rnull\t'), isNull);
-    expect(JSON.decode(' "hi there\\" bob" '), equals('hi there" bob'));
-    expect(JSON.decode(' "" '), isEmpty);
-
-    // Lists.
-    expect(JSON.decode(' [] '), isEmpty);
-    expect(JSON.decode('[ ]'), isEmpty);
-    expect(JSON.decode(' [3, -4.5, true, "hi", false] '),
-      equals([3, -4.5, true, 'hi', false]));
-    // Nulls are tricky.
-    expect(JSON.decode('[null]'), orderedEquals([null]));
-    expect(JSON.decode(' [3, -4.5, null, true, "hi", false] '),
-      equals([3, -4.5, null, true, 'hi', false]));
-    expect(JSON.decode('[[null]]'), equals([[null]]));
-    expect(JSON.decode(' [ [3], [], [null], ["hi", true]] '),
-      equals([[3], [], [null], ['hi', true]]));
-
-    // Maps.
-    expect(JSON.decode(' {} '), isEmpty);
-    expect(JSON.decode('{ }'), isEmpty);
-
-    expect(JSON.decode(
-        ' {"x":3, "y": -4.5,  "z" : "hi","u" : true, "v": false } '),
-        equals({"x":3, "y": -4.5,  "z" : "hi", "u" : true, "v": false }));
-
-    expect(JSON.decode(' {"x":3, "y": -4.5,  "z" : "hi" } '),
-        equals({"x":3, "y": -4.5,  "z" : "hi" }));
-
-    expect(JSON.decode(' {"y": -4.5,  "z" : "hi" ,"x":3 } '),
-        equals({"y": -4.5,  "z" : "hi" ,"x":3 }));
-
-    expect(JSON.decode('{ " hi bob " :3, "": 4.5}'),
-        equals({ " hi bob " :3, "": 4.5}));
-
-    expect(JSON.decode(' { "x" : { } } '), equals({ 'x' : {}}));
-    expect(JSON.decode('{"x":{}}'), equals({ 'x' : {}}));
-
-    // Nulls are tricky.
-    expect(JSON.decode('{"w":null}'), equals({ 'w' : null}));
-
-    expect(JSON.decode('{"x":{"w":null}}'), equals({"x":{"w":null}}));
-
-    expect(JSON.decode(' {"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.decode('{"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.encode(5), equals('5'));
-    expect(JSON.encode(-42), equals('-42'));
-    // Dart does not guarantee a formatting for doubles,
-    // so reparse and compare to the original.
-    validateRoundTrip(3.14);
-    expect(JSON.encode(true), equals('true'));
-    expect(JSON.encode(false), equals('false'));
-    expect(JSON.encode(null), equals('null'));
-    expect(JSON.encode(' hi there" bob '), equals('" hi there\\" bob "'));
-    expect(JSON.encode('hi\\there'), equals('"hi\\\\there"'));
-    expect(JSON.encode('hi\nthere'), equals('"hi\\nthere"'));
-    expect(JSON.encode('hi\r\nthere'), equals('"hi\\r\\nthere"'));
-    expect(JSON.encode(''), equals('""'));
-
-    // Lists.
-    expect(JSON.encode([]), equals('[]'));
-    expect(JSON.encode(new List(0)), equals('[]'));
-    expect(JSON.encode(new List(3)), equals('[null,null,null]'));
-    validateRoundTrip([3, -4.5, null, true, 'hi', false]);
-    expect(JSON.encode([[3], [], [null], ['hi', true]]),
-      equals('[[3],[],[null],["hi",true]]'));
-
-    // Maps.
-    expect(JSON.encode({}), equals('{}'));
-    expect(JSON.encode(new Map()), equals('{}'));
-    expect(JSON.encode({'x':{}}), equals('{"x":{}}'));
-    expect(JSON.encode({'x':{'a':3}}), equals('{"x":{"a":3}}'));
-
-    // Dart does not guarantee an order on the keys
-    // of a map literal, so reparse and compare to the original Map.
-    validateRoundTrip(
-        {'x':3, 'y':-4.5, 'z':'hi', 'w':null, 'u':true, 'v':false});
-    validateRoundTrip({"x":3, "y":-4.5, "z":'hi'});
-    validateRoundTrip({' hi bob ':3, '':4.5});
-    validateRoundTrip(
-        {'x':{'a':3, 'b':-4.5}, 'y':[{}], 'z':'hi', 'w':{'c':null, 'd':true},
-                  'v':null});
-
-    expect(JSON.encode(new ToJson(4)), "4");
-    expect(JSON.encode(new ToJson([4, "a"])), '[4,"a"]');
-    expect(JSON.encode(new ToJson([4, new ToJson({"x":42})])),
-           '[4,{"x":42}]');
-
-    expect(() => JSON.encode([new ToJson(new ToJson(4))]), throws);
-
-    expect(() => JSON.encode([new Object()]), throws);
-  });
-
-  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.encode(new TestClass()), throws);
-  });
-
-  test('stringify custom converter', () {
-    List l = [const C(0), const C(1)];
-    expect(JSON.encode(l, toEncodable: (x) => "C(${x.id})"),
-           equals('["C(0)","C(1)"]'));
-    expect(JSON.encode(l), equals('["C/0","C/1"]'));
-  });
-}
-
-class C {
-  final int id;
-  const C(this.id);
-  toJson() => "C/$id";
-}
-
-class TestClass {
-  int x;
-  String y;
-
-  TestClass() : x = 3, y = 'joe' { }
-}
-
-class ToJson {
-  final object;
-  const ToJson(this.object);
-  toJson() => object;
-}
-
-/**
- * Checks that the argument can be converted to a JSON string and
- * back, and produce something equivalent to the argument.
- */
-void validateRoundTrip(expected) {
-  expect(JSON.decode(JSON.encode(expected)), equals(expected));
-}