mcs/class/System.Json/Test/System.Json/JsonValueTest.cs

   1 //
   2 // JsonValueTest.cs: Tests for JSonValue
   3 //
   4 // Copyright 2011 Xamarin, Inc.
   5 //
   6 // Authors:
   7 //   Miguel de Icaza
   8 //
   9 using NUnit.Framework;
  10 using System;
  11 using System.IO;
  12 using System.Text;
  13 using System.Json;
  14 using System.Globalization;
  15 using System.Threading;
  16
  17 namespace MonoTests.System
  18 {
  19         [TestFixture]
  20         public class JsonValueTests {
  21                 // Tests that a trailing comma is allowed in dictionary definitions
  22                 [Test]
  23                 public void LoadWithTrailingComma ()
  24                 {
  25                         var j = JsonValue.Load (new StringReader ("{ \"a\": \"b\",}"));
  26                         Assert.AreEqual (1, j.Count, "itemcount");
  27                         Assert.AreEqual (JsonType.String, j ["a"].JsonType, "type");
  28                         Assert.AreEqual ("b", (string) j ["a"], "value");
  29
  30                         JsonValue.Parse ("[{ \"a\": \"b\",}]");
  31                 }
  32
  33                 [Test]
  34                 public void LoadWithTrailingComma2 ()
  35                 {
  36                         JsonValue.Parse ("[{ \"a\": \"b\",}]");
  37                 }
  38
  39                 // Test that we correctly serialize JsonArray with null elements.
  40                 [Test]
  41                 public void ToStringOnJsonArrayWithNulls () {
  42                         var j = JsonValue.Load (new StringReader ("[1,2,3,null]"));
  43                         Assert.AreEqual (4, j.Count, "itemcount");
  44                         Assert.AreEqual (JsonType.Array, j.JsonType, "type");
  45                         var str = j.ToString ();
  46                         Assert.AreEqual (str, "[1, 2, 3, null]");
  47                 }
  48
  49                 // Test that we correctly serialize JsonObject with null elements.
  50                 [Test]
  51                 public void ToStringOnJsonObjectWithNulls () {
  52                         var j = JsonValue.Load (new StringReader ("{\"a\":null,\"b\":2}"));
  53                         Assert.AreEqual (2, j.Count, "itemcount");
  54                         Assert.AreEqual (JsonType.Object, j.JsonType, "type");
  55                         var str = j.ToString ();
  56                         Assert.AreEqual (str, "{\"a\": null, \"b\": 2}");
  57                 }
  58
  59                 [Test]
  60                 public void JsonObjectOrder () {
  61                         var obj = new JsonObject ();
  62                         obj["a"] = 1;
  63                         obj["c"] = 3;
  64                         obj["b"] = 2;
  65                         var str = obj.ToString ();
  66                         Assert.AreEqual (str, "{\"a\": 1, \"b\": 2, \"c\": 3}");
  67                 }
  68
  69                 [Test]
  70                 public void QuoteEscapeBug_20869 ()
  71                 {
  72                         Assert.AreEqual ((new JsonPrimitive ("\"\"")).ToString (), "\"\\\"\\\"\"");
  73                 }
  74
  75                 void ExpectError (string s)
  76                 {
  77                         try {
  78                                 JsonValue.Parse (s);
  79                                 Assert.Fail ("Expected ArgumentException for `" + s + "'");
  80                         } catch (ArgumentException) {
  81                         }
  82                 }
  83
  84                 // Test whether an exception is thrown for invalid JSON
  85                 [Test]
  86                 public void CheckErrors ()
  87                 {
  88                         ExpectError (@"-");
  89                         ExpectError (@"- ");
  90                         ExpectError (@"1.");
  91                         ExpectError (@"1. ");
  92                         ExpectError (@"1e+");
  93                         ExpectError (@"1 2");
  94                         ExpectError (@"077");
  95
  96                         ExpectError (@"[1,]");
  97
  98                         //ExpectError (@"{""a"":1,}"); // Not valid JSON, allowed anyway
  99                 }
 100
 101                 // Parse a json string and compare to the expected value
 102                 void CheckDouble (double expected, string json)
 103                 {
 104                         double jvalue = (double) JsonValue.Parse (json);
 105                         Assert.AreEqual (expected, jvalue);
 106                 }
 107
 108                 // Convert a number to json and parse the string, then compare the result to the original value
 109                 void CheckDouble (double number)
 110                 {
 111                         double jvalue = (double) JsonValue.Parse (new JsonPrimitive (number).ToString ());
 112                         Assert.AreEqual (number, jvalue); // should be exactly the same
 113                 }
 114
 115                 [Test]
 116                 public void CheckNumbers ()
 117                 {
 118                         CheckDouble (0, "0");
 119                         CheckDouble (0, "-0");
 120                         CheckDouble (0, "0.00");
 121                         CheckDouble (0, "-0.00");
 122                         CheckDouble (1, "1");
 123                         CheckDouble (1.1, "1.1");
 124                         CheckDouble (-1, "-1");
 125                         CheckDouble (-1.1, "-1.1");
 126                         CheckDouble (1e-10, "1e-10");
 127                         CheckDouble (1e+10, "1e+10");
 128                         CheckDouble (1e-30, "1e-30");
 129                         CheckDouble (1e+30, "1e+30");
 130
 131                         CheckDouble (1, "\"1\"");
 132                         CheckDouble (1.1, "\"1.1\"");
 133                         CheckDouble (-1, "\"-1\"");
 134                         CheckDouble (-1.1, "\"-1.1\"");
 135
 136                         CheckDouble (double.NaN, "\"NaN\"");
 137                         CheckDouble (double.PositiveInfinity, "\"Infinity\"");
 138                         CheckDouble (double.NegativeInfinity, "\"-Infinity\"");
 139
 140                         ExpectError ("NaN");
 141                         ExpectError ("Infinity");
 142                         ExpectError ("-Infinity");
 143
 144                         Assert.AreEqual ("1.1", new JsonPrimitive (1.1).ToString ());
 145                         Assert.AreEqual ("-1.1", new JsonPrimitive (-1.1).ToString ());
 146                         Assert.AreEqual ("1E-20", new JsonPrimitive (1e-20).ToString ());
 147                         Assert.AreEqual ("1E+20", new JsonPrimitive (1e+20).ToString ());
 148                         Assert.AreEqual ("1E-30", new JsonPrimitive (1e-30).ToString ());
 149                         Assert.AreEqual ("1E+30", new JsonPrimitive (1e+30).ToString ());
 150                         Assert.AreEqual ("\"NaN\"", new JsonPrimitive (double.NaN).ToString ());
 151                         Assert.AreEqual ("\"Infinity\"", new JsonPrimitive (double.PositiveInfinity).ToString ());
 152                         Assert.AreEqual ("\"-Infinity\"", new JsonPrimitive (double.NegativeInfinity).ToString ());
 153
 154                         Assert.AreEqual ("1E-30", JsonValue.Parse ("1e-30").ToString ());
 155                         Assert.AreEqual ("1E+30", JsonValue.Parse ("1e+30").ToString ());
 156
 157                         CheckDouble (1);
 158                         CheckDouble (1.1);
 159                         CheckDouble (1.25);
 160                         CheckDouble (-1);
 161                         CheckDouble (-1.1);
 162                         CheckDouble (-1.25);
 163                         CheckDouble (1e-20);
 164                         CheckDouble (1e+20);
 165                         CheckDouble (1e-30);
 166                         CheckDouble (1e+30);
 167                         CheckDouble (3.1415926535897932384626433);
 168                         CheckDouble (3.1415926535897932384626433e-20);
 169                         CheckDouble (3.1415926535897932384626433e+20);
 170                         CheckDouble (double.NaN);
 171                         CheckDouble (double.PositiveInfinity);
 172                         CheckDouble (double.NegativeInfinity);
 173                         CheckDouble (double.MinValue);
 174                         CheckDouble (double.MaxValue);
 175
 176                         // A number which needs 17 digits (see http://stackoverflow.com/questions/6118231/why-do-i-need-17-significant-digits-and-not-16-to-represent-a-double)
 177                         CheckDouble (18014398509481982.0);
 178
 179                         // Values around the smallest positive decimal value
 180                         CheckDouble (1.123456789e-29);
 181                         CheckDouble (1.123456789e-28);
 182
 183                         CheckDouble (1.1E-29, "0.000000000000000000000000000011");
 184                         // This is being parsed as a decimal and rounded to 1e-28, even though it can be more accurately be represented by a double
 185                         //CheckDouble (1.1E-28, "0.00000000000000000000000000011");
 186                 }
 187
 188                 // Retry the test with different locales
 189                 [Test]
 190                 public void CheckNumbersCulture ()
 191                 {
 192                         CultureInfo old = Thread.CurrentThread.CurrentCulture;
 193                         try {
 194                                 Thread.CurrentThread.CurrentCulture = new CultureInfo ("en");
 195                                 CheckNumbers ();
 196                                 Thread.CurrentThread.CurrentCulture = new CultureInfo ("fr");
 197                                 CheckNumbers ();
 198                                 Thread.CurrentThread.CurrentCulture = new CultureInfo ("de");
 199                                 CheckNumbers ();
 200                         } finally {
 201                                 Thread.CurrentThread.CurrentCulture = old;
 202                         }
 203                 }
 204
 205                 // Convert a string to json and parse the string, then compare the result to the original value
 206                 void CheckString (string str)
 207                 {
 208                         var json = new JsonPrimitive (str).ToString ();
 209                         // Check whether the string is valid Unicode (will throw for broken surrogate pairs)
 210                         new UTF8Encoding (false, true).GetBytes (json);
 211                         string jvalue = (string) JsonValue.Parse (json);
 212                         Assert.AreEqual (str, jvalue);
 213                 }
 214
 215                 // String handling: http://tools.ietf.org/html/rfc7159#section-7
 216                 [Test]
 217                 public void CheckStrings ()
 218                 {
 219                         Assert.AreEqual ("\"test\"", new JsonPrimitive ("test").ToString ());
 220                         // Handling of characters
 221                         Assert.AreEqual ("\"f\"", new JsonPrimitive ('f').ToString ());
 222                         Assert.AreEqual ('f', (char) JsonValue.Parse ("\"f\""));
 223
 224                         // Control characters with special escape sequence
 225                         Assert.AreEqual ("\"\\b\\f\\n\\r\\t\"", new JsonPrimitive ("\b\f\n\r\t").ToString ());
 226                         // Other characters which must be escaped
 227                         Assert.AreEqual (@"""\""\\""", new JsonPrimitive ("\"\\").ToString ());
 228                         // Control characters without special escape sequence
 229                         for (int i = 0; i < 32; i++)
 230                                 if (i != '\b' && i != '\f' && i != '\n' && i != '\r' && i != '\t')
 231                                         Assert.AreEqual ("\"\\u" + i.ToString ("x04") + "\"", new JsonPrimitive ("" + (char) i).ToString ());
 232
 233                         // JSON does not require U+2028 and U+2029 to be escaped, but
 234                         // JavaScript does require this:
 235                         // http://stackoverflow.com/questions/2965293/javascript-parse-error-on-u2028-unicode-character/9168133#9168133
 236                         Assert.AreEqual ("\"\\u2028\\u2029\"", new JsonPrimitive ("\u2028\u2029").ToString ());
 237
 238                         // '/' also does not have to be escaped, but escaping it when
 239                         // preceeded by a '<' avoids problems with JSON in HTML <script> tags
 240                         Assert.AreEqual ("\"<\\/\"", new JsonPrimitive ("</").ToString ());
 241                         // Don't escape '/' in other cases as this makes the JSON hard to read
 242                         Assert.AreEqual ("\"/bar\"", new JsonPrimitive ("/bar").ToString ());
 243                         Assert.AreEqual ("\"foo/bar\"", new JsonPrimitive ("foo/bar").ToString ());
 244
 245                         CheckString ("test\b\f\n\r\t\"\\/</\0x");
 246                         for (int i = 0; i < 65536; i++)
 247                                 CheckString ("x" + ((char) i));
 248
 249                         // Check broken surrogate pairs
 250                         CheckString ("\ud800");
 251                         CheckString ("x\ud800");
 252                         CheckString ("\udfff\ud800");
 253                         CheckString ("\ude03\ud912");
 254                         CheckString ("\uc000\ubfff");
 255                         CheckString ("\udfffx");
 256                         // Valid strings should not be escaped:
 257                         Assert.AreEqual ("\"\ud7ff\"", new JsonPrimitive ("\ud7ff").ToString ());
 258                         Assert.AreEqual ("\"\ue000\"", new JsonPrimitive ("\ue000").ToString ());
 259                         Assert.AreEqual ("\"\ud800\udc00\"", new JsonPrimitive ("\ud800\udc00").ToString ());
 260                         Assert.AreEqual ("\"\ud912\ude03\"", new JsonPrimitive ("\ud912\ude03").ToString ());
 261                         Assert.AreEqual ("\"\udbff\udfff\"", new JsonPrimitive ("\udbff\udfff").ToString ());
 262                 }
 263         }
 264 }