base: Move many JSONValueSerializer unit tests from chrome/common to base.

base/json/json_value_serializer_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <string>
 
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_string_value_serializer.h"
+#include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_util.h"
+#include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 namespace {
 
 // Some proper JSON to test with:
 const char kProperJSON[] =
     "{\n"
@@ skipping 25 matching lines @@
   JSONStringValueSerializer str_serializer(&serialized_json);
   str_serializer.set_pretty_print(true);
   ASSERT_TRUE(str_serializer.Serialize(value));
   // Unify line endings between platforms.
   ReplaceSubstringsAfterOffset(&serialized_json, 0,
                                kWinLineEnds, kLinuxLineEnds);
   // Now compare the input with the output.
   ASSERT_EQ(kProperJSON, serialized_json);
 }
 
+void ValidateJsonList(const std::string& json) {
+  scoped_ptr<Value> root(JSONReader::Read(json));
+  ASSERT_TRUE(root.get() && root->IsType(Value::TYPE_LIST));
+  ListValue* list = static_cast<ListValue*>(root.get());
+  ASSERT_EQ(1U, list->GetSize());
+  Value* elt = NULL;
+  ASSERT_TRUE(list->Get(0, &elt));
+  int value = 0;
+  ASSERT_TRUE(elt && elt->GetAsInteger(&value));
+  ASSERT_EQ(1, value);
+}
+
 // Test proper JSON [de]serialization from string is working.
 TEST(JSONValueSerializerTest, ReadProperJSONFromString) {
   // Try to deserialize it through the serializer.
   std::string proper_json(kProperJSON);
   JSONStringValueSerializer str_deserializer(proper_json);
 
   int error_code = 0;
   std::string error_message;
   scoped_ptr<Value> value(
       str_deserializer.Deserialize(&error_code, &error_message));
@@ skipping 74 matching lines @@
   ASSERT_FALSE(error_message.empty());
   // Now the flag is set and it must pass.
   file_deserializer.set_allow_trailing_comma(true);
   value.reset(file_deserializer.Deserialize(&error_code, &error_message));
   ASSERT_TRUE(value.get());
   ASSERT_EQ(JSONReader::JSON_TRAILING_COMMA, error_code);
   // Verify if the same JSON is still there.
   CheckJSONIsStillTheSame(*value);
 }
 
+TEST(JSONValueSerializerTest, Roundtrip) {
+  const std::string original_serialization =
+    "{\"bool\":true,\"double\":3.14,\"int\":42,\"list\":[1,2],\"null\":null}";
+  JSONStringValueSerializer serializer(original_serialization);
+  scoped_ptr<Value> root(serializer.Deserialize(NULL, NULL));
+  ASSERT_TRUE(root.get());
+  ASSERT_TRUE(root->IsType(Value::TYPE_DICTIONARY));
+
+  DictionaryValue* root_dict = static_cast<DictionaryValue*>(root.get());
+
+  Value* null_value = NULL;
+  ASSERT_TRUE(root_dict->Get("null", &null_value));
+  ASSERT_TRUE(null_value);
+  ASSERT_TRUE(null_value->IsType(Value::TYPE_NULL));
+
+  bool bool_value = false;
+  ASSERT_TRUE(root_dict->GetBoolean("bool", &bool_value));
+  ASSERT_TRUE(bool_value);
+
+  int int_value = 0;
+  ASSERT_TRUE(root_dict->GetInteger("int", &int_value));
+  ASSERT_EQ(42, int_value);
+
+  double double_value = 0.0;
+  ASSERT_TRUE(root_dict->GetDouble("double", &double_value));
+  ASSERT_DOUBLE_EQ(3.14, double_value);
+
+  // We shouldn't be able to write using this serializer, since it was
+  // initialized with a const string.
+  ASSERT_FALSE(serializer.Serialize(*root_dict));
+
+  std::string test_serialization = "";
+  JSONStringValueSerializer mutable_serializer(&test_serialization);
+  ASSERT_TRUE(mutable_serializer.Serialize(*root_dict));
+  ASSERT_EQ(original_serialization, test_serialization);
+
+  mutable_serializer.set_pretty_print(true);
+  ASSERT_TRUE(mutable_serializer.Serialize(*root_dict));
+  // JSON output uses a different newline style on Windows than on other
+  // platforms.
+#if defined(OS_WIN)
+#define JSON_NEWLINE "\r\n"
+#else
+#define JSON_NEWLINE "\n"
+#endif
+  const std::string pretty_serialization =
+    "{" JSON_NEWLINE
+    "   \"bool\": true," JSON_NEWLINE
+    "   \"double\": 3.14," JSON_NEWLINE
+    "   \"int\": 42," JSON_NEWLINE
+    "   \"list\": [ 1, 2 ]," JSON_NEWLINE
+    "   \"null\": null" JSON_NEWLINE
+    "}" JSON_NEWLINE;
+#undef JSON_NEWLINE
+  ASSERT_EQ(pretty_serialization, test_serialization);
+}
+
+TEST(JSONValueSerializerTest, StringEscape) {
+  string16 all_chars;
+  for (int i = 1; i < 256; ++i) {
+    all_chars += static_cast<char16>(i);
+  }
+  // Generated in in Firefox using the following js (with an extra backslash for
+  // double quote):
+  // var s = '';
+  // for (var i = 1; i < 256; ++i) { s += String.fromCharCode(i); }
+  // uneval(s).replace(/\\/g, "\\\\");
+  std::string all_chars_expected =
+      "\\u0001\\u0002\\u0003\\u0004\\u0005\\u0006\\u0007\\b\\t\\n\\u000B\\f\\r"
+      "\\u000E\\u000F\\u0010\\u0011\\u0012\\u0013\\u0014\\u0015\\u0016\\u0017"
+      "\\u0018\\u0019\\u001A\\u001B\\u001C\\u001D\\u001E\\u001F !\\\""
+      "#$%&'()*+,-./0123456789:;\\u003C=\\u003E?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\"
+      "\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\\u007F\\u0080\\u0081\\u0082\\u0083"
+      "\\u0084\\u0085\\u0086\\u0087\\u0088\\u0089\\u008A\\u008B\\u008C\\u008D"
+      "\\u008E\\u008F\\u0090\\u0091\\u0092\\u0093\\u0094\\u0095\\u0096\\u0097"
+      "\\u0098\\u0099\\u009A\\u009B\\u009C\\u009D\\u009E\\u009F\\u00A0\\u00A1"
+      "\\u00A2\\u00A3\\u00A4\\u00A5\\u00A6\\u00A7\\u00A8\\u00A9\\u00AA\\u00AB"
+      "\\u00AC\\u00AD\\u00AE\\u00AF\\u00B0\\u00B1\\u00B2\\u00B3\\u00B4\\u00B5"
+      "\\u00B6\\u00B7\\u00B8\\u00B9\\u00BA\\u00BB\\u00BC\\u00BD\\u00BE\\u00BF"
+      "\\u00C0\\u00C1\\u00C2\\u00C3\\u00C4\\u00C5\\u00C6\\u00C7\\u00C8\\u00C9"
+      "\\u00CA\\u00CB\\u00CC\\u00CD\\u00CE\\u00CF\\u00D0\\u00D1\\u00D2\\u00D3"
+      "\\u00D4\\u00D5\\u00D6\\u00D7\\u00D8\\u00D9\\u00DA\\u00DB\\u00DC\\u00DD"
+      "\\u00DE\\u00DF\\u00E0\\u00E1\\u00E2\\u00E3\\u00E4\\u00E5\\u00E6\\u00E7"
+      "\\u00E8\\u00E9\\u00EA\\u00EB\\u00EC\\u00ED\\u00EE\\u00EF\\u00F0\\u00F1"
+      "\\u00F2\\u00F3\\u00F4\\u00F5\\u00F6\\u00F7\\u00F8\\u00F9\\u00FA\\u00FB"
+      "\\u00FC\\u00FD\\u00FE\\u00FF";
+
+  std::string expected_output = "{\"all_chars\":\"" + all_chars_expected +
+                                 "\"}";
+  // Test JSONWriter interface
+  std::string output_js;
+  DictionaryValue valueRoot;
+  valueRoot.SetString("all_chars", all_chars);
+  JSONWriter::Write(&valueRoot, &output_js);
+  ASSERT_EQ(expected_output, output_js);
+
+  // Test JSONValueSerializer interface (uses JSONWriter).
+  JSONStringValueSerializer serializer(&output_js);
+  ASSERT_TRUE(serializer.Serialize(valueRoot));
+  ASSERT_EQ(expected_output, output_js);
+}
+
+TEST(JSONValueSerializerTest, UnicodeStrings) {
+  // unicode string json -> escaped ascii text
+  DictionaryValue root;
+  string16 test(WideToUTF16(L"\x7F51\x9875"));
+  root.SetString("web", test);
+
+  std::string expected = "{\"web\":\"\\u7F51\\u9875\"}";
+
+  std::string actual;
+  JSONStringValueSerializer serializer(&actual);
+  ASSERT_TRUE(serializer.Serialize(root));
+  ASSERT_EQ(expected, actual);
+
+  // escaped ascii text -> json
+  JSONStringValueSerializer deserializer(expected);
+  scoped_ptr<Value> deserial_root(deserializer.Deserialize(NULL, NULL));
+  ASSERT_TRUE(deserial_root.get());
+  DictionaryValue* dict_root =
+      static_cast<DictionaryValue*>(deserial_root.get());
+  string16 web_value;
+  ASSERT_TRUE(dict_root->GetString("web", &web_value));
+  ASSERT_EQ(test, web_value);
+}
+
+TEST(JSONValueSerializerTest, HexStrings) {
+  // hex string json -> escaped ascii text
+  DictionaryValue root;
+  string16 test(WideToUTF16(L"\x01\x02"));
+  root.SetString("test", test);
+
+  std::string expected = "{\"test\":\"\\u0001\\u0002\"}";
+
+  std::string actual;
+  JSONStringValueSerializer serializer(&actual);
+  ASSERT_TRUE(serializer.Serialize(root));
+  ASSERT_EQ(expected, actual);
+
+  // escaped ascii text -> json
+  JSONStringValueSerializer deserializer(expected);
+  scoped_ptr<Value> deserial_root(deserializer.Deserialize(NULL, NULL));
+  ASSERT_TRUE(deserial_root.get());
+  DictionaryValue* dict_root =
+      static_cast<DictionaryValue*>(deserial_root.get());
+  string16 test_value;
+  ASSERT_TRUE(dict_root->GetString("test", &test_value));
+  ASSERT_EQ(test, test_value);
+
+  // Test converting escaped regular chars
+  std::string escaped_chars = "{\"test\":\"\\u0067\\u006f\"}";
+  JSONStringValueSerializer deserializer2(escaped_chars);
+  deserial_root.reset(deserializer2.Deserialize(NULL, NULL));
+  ASSERT_TRUE(deserial_root.get());
+  dict_root = static_cast<DictionaryValue*>(deserial_root.get());
+  ASSERT_TRUE(dict_root->GetString("test", &test_value));
+  ASSERT_EQ(ASCIIToUTF16("go"), test_value);
+}
+
+TEST(JSONValueSerializerTest, AllowTrailingComma) {
+  scoped_ptr<Value> root;
+  scoped_ptr<Value> root_expected;
+  std::string test_with_commas("{\"key\": [true,],}");
+  std::string test_no_commas("{\"key\": [true]}");
+
+  JSONStringValueSerializer serializer(test_with_commas);
+  serializer.set_allow_trailing_comma(true);
+  JSONStringValueSerializer serializer_expected(test_no_commas);
+  root.reset(serializer.Deserialize(NULL, NULL));
+  ASSERT_TRUE(root.get());
+  root_expected.reset(serializer_expected.Deserialize(NULL, NULL));
+  ASSERT_TRUE(root_expected.get());
+  ASSERT_TRUE(root->Equals(root_expected.get()));
+}
+
+TEST(JSONValueSerializerTest, JSONReaderComments) {
+  ValidateJsonList("[ // 2, 3, ignore me ] \n1 ]");
+  ValidateJsonList("[ /* 2, \n3, ignore me ]*/ \n1 ]");
+  ValidateJsonList("//header\n[ // 2, \n// 3, \n1 ]// footer");
+  ValidateJsonList("/*\n[ // 2, \n// 3, \n1 ]*/[1]");
+  ValidateJsonList("[ 1 /* one */ ] /* end */");
+  ValidateJsonList("[ 1 //// ,2\r\n ]");
+
+  scoped_ptr<Value> root;
+
+  // It's ok to have a comment in a string.
+  root.reset(JSONReader::Read("[\"// ok\\n /* foo */ \"]"));
+  ASSERT_TRUE(root.get() && root->IsType(Value::TYPE_LIST));
+  ListValue* list = static_cast<ListValue*>(root.get());
+  ASSERT_EQ(1U, list->GetSize());
+  Value* elt = NULL;
+  ASSERT_TRUE(list->Get(0, &elt));
+  std::string value;
+  ASSERT_TRUE(elt && elt->GetAsString(&value));
+  ASSERT_EQ("// ok\n /* foo */ ", value);
+
+  // You can't nest comments.
+  root.reset(JSONReader::Read("/* /* inner */ outer */ [ 1 ]"));
+  ASSERT_FALSE(root.get());
+
+  // Not a open comment token.
+  root.reset(JSONReader::Read("/ * * / [1]"));
+  ASSERT_FALSE(root.get());
+}
+
 }  // namespace
 
 }  // namespace base
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