base/json/json_writer_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/json/json_writer.h"
   6 #include "base/values.h"
   7 #include "testing/gtest/include/gtest/gtest.h"
   8
   9 namespace base {
  10
  11 TEST(JSONWriterTest, Writing) {
  12   // Test null
  13   Value* root = Value::CreateNullValue();
  14   std::string output_js;
  15   JSONWriter::Write(root, &output_js);
  16   ASSERT_EQ("null", output_js);
  17   delete root;
  18
  19   // Test empty dict
  20   root = new DictionaryValue;
  21   JSONWriter::Write(root, &output_js);
  22   ASSERT_EQ("{}", output_js);
  23   delete root;
  24
  25   // Test empty list
  26   root = new ListValue;
  27   JSONWriter::Write(root, &output_js);
  28   ASSERT_EQ("[]", output_js);
  29   delete root;
  30
  31   // Test Real values should always have a decimal or an 'e'.
  32   root = new FundamentalValue(1.0);
  33   JSONWriter::Write(root, &output_js);
  34   ASSERT_EQ("1.0", output_js);
  35   delete root;
  36
  37   // Test Real values in the the range (-1, 1) must have leading zeros
  38   root = new FundamentalValue(0.2);
  39   JSONWriter::Write(root, &output_js);
  40   ASSERT_EQ("0.2", output_js);
  41   delete root;
  42
  43   // Test Real values in the the range (-1, 1) must have leading zeros
  44   root = new FundamentalValue(-0.8);
  45   JSONWriter::Write(root, &output_js);
  46   ASSERT_EQ("-0.8", output_js);
  47   delete root;
  48
  49   // Writer unittests like empty list/dict nesting,
  50   // list list nesting, etc.
  51   DictionaryValue root_dict;
  52   ListValue* list = new ListValue;
  53   root_dict.Set("list", list);
  54   DictionaryValue* inner_dict = new DictionaryValue;
  55   list->Append(inner_dict);
  56   inner_dict->SetInteger("inner int", 10);
  57   ListValue* inner_list = new ListValue;
  58   list->Append(inner_list);
  59   list->Append(new FundamentalValue(true));
  60
  61   // Test the pretty-printer.
  62   JSONWriter::Write(&root_dict, &output_js);
  63   ASSERT_EQ("{\"list\":[{\"inner int\":10},[],true]}", output_js);
  64   JSONWriter::WriteWithOptions(&root_dict, JSONWriter::OPTIONS_PRETTY_PRINT,
  65                                &output_js);
  66   // The pretty-printer uses a different newline style on Windows than on
  67   // other platforms.
  68 #if defined(OS_WIN)
  69 #define JSON_NEWLINE "\r\n"
  70 #else
  71 #define JSON_NEWLINE "\n"
  72 #endif
  73   ASSERT_EQ("{" JSON_NEWLINE
  74             "   \"list\": [ {" JSON_NEWLINE
  75             "      \"inner int\": 10" JSON_NEWLINE
  76             "   }, [  ], true ]" JSON_NEWLINE
  77             "}" JSON_NEWLINE,
  78             output_js);
  79 #undef JSON_NEWLINE
  80
  81   // Test keys with periods
  82   DictionaryValue period_dict;
  83   period_dict.SetWithoutPathExpansion("a.b", new FundamentalValue(3));
  84   period_dict.SetWithoutPathExpansion("c", new FundamentalValue(2));
  85   DictionaryValue* period_dict2 = new DictionaryValue;
  86   period_dict2->SetWithoutPathExpansion("g.h.i.j", new FundamentalValue(1));
  87   period_dict.SetWithoutPathExpansion("d.e.f", period_dict2);
  88   JSONWriter::Write(&period_dict, &output_js);
  89   ASSERT_EQ("{\"a.b\":3,\"c\":2,\"d.e.f\":{\"g.h.i.j\":1}}", output_js);
  90
  91   DictionaryValue period_dict3;
  92   period_dict3.Set("a.b", new FundamentalValue(2));
  93   period_dict3.SetWithoutPathExpansion("a.b", new FundamentalValue(1));
  94   JSONWriter::Write(&period_dict3, &output_js);
  95   ASSERT_EQ("{\"a\":{\"b\":2},\"a.b\":1}", output_js);
  96
  97   // Test omitting binary values.
  98   root = BinaryValue::CreateWithCopiedBuffer("asdf", 4);
  99   JSONWriter::WriteWithOptions(root, JSONWriter::OPTIONS_OMIT_BINARY_VALUES,
 100                                &output_js);
 101   ASSERT_TRUE(output_js.empty());
 102   delete root;
 103
 104   ListValue binary_list;
 105   binary_list.Append(new FundamentalValue(5));
 106   binary_list.Append(BinaryValue::CreateWithCopiedBuffer("asdf", 4));
 107   binary_list.Append(new FundamentalValue(2));
 108   JSONWriter::WriteWithOptions(&binary_list,
 109                                JSONWriter::OPTIONS_OMIT_BINARY_VALUES,
 110                                &output_js);
 111   ASSERT_EQ("[5,2]", output_js);
 112
 113   DictionaryValue binary_dict;
 114   binary_dict.Set("a", new FundamentalValue(5));
 115   binary_dict.Set("b", BinaryValue::CreateWithCopiedBuffer("asdf", 4));
 116   binary_dict.Set("c", new FundamentalValue(2));
 117   JSONWriter::WriteWithOptions(&binary_dict,
 118                                JSONWriter::OPTIONS_OMIT_BINARY_VALUES,
 119                                &output_js);
 120   ASSERT_EQ("{\"a\":5,\"c\":2}", output_js);
 121
 122   // Test allowing a double with no fractional part to be written as an integer.
 123   FundamentalValue double_value(1e10);
 124   JSONWriter::WriteWithOptions(
 125       &double_value,
 126       JSONWriter::OPTIONS_OMIT_DOUBLE_TYPE_PRESERVATION,
 127       &output_js);
 128   ASSERT_EQ("10000000000", output_js);
 129 }
 130
 131 }  // namespace base