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]
  50                 public void QuoteEscapeBug_20869 ()
  51                 {
  52                         Assert.AreEqual ((new JsonPrimitive ("\"\"")).ToString (), "\"\\\"\\\"\"");
  53                 }
  54
  55                 void ExpectError (string s)
  56                 {
  57                         try {
  58                                 JsonValue.Parse (s);
  59                                 Assert.Fail ("Expected ArgumentException for `" + s + "'");
  60                         } catch (ArgumentException) {
  61                         }
  62                 }
  63
  64                 // Test whether an exception is thrown for invalid JSON
  65                 [Test]
  66                 public void CheckErrors ()
  67                 {
  68                         ExpectError (@"-");
  69                         ExpectError (@"- ");
  70                         ExpectError (@"1.");
  71                         ExpectError (@"1. ");
  72                         ExpectError (@"1e+");
  73                         ExpectError (@"1 2");
  74                         ExpectError (@"077");
  75
  76                         ExpectError (@"[1,]");
  77
  78                         //ExpectError (@"{""a"":1,}"); // Not valid JSON, allowed anyway
  79                 }
  80
  81                 // Parse a json string and compare to the expected value
  82                 void CheckDouble (double expected, string json)
  83                 {
  84                         double jvalue = (double) JsonValue.Parse (json);
  85                         Assert.AreEqual (expected, jvalue);
  86                 }
  87
  88                 // Convert a number to json and parse the string, then compare the result to the original value
  89                 void CheckDouble (double number)
  90                 {
  91                         double jvalue = (double) JsonValue.Parse (new JsonPrimitive (number).ToString ());
  92                         Assert.AreEqual (number, jvalue); // should be exactly the same
  93                 }
  94
  95                 [Test]
  96                 public void CheckNumbers ()
  97                 {
  98                         CheckDouble (0, "0");
  99                         CheckDouble (0, "-0");
 100                         CheckDouble (0, "0.00");
 101                         CheckDouble (0, "-0.00");
 102                         CheckDouble (1, "1");
 103                         CheckDouble (1.1, "1.1");
 104                         CheckDouble (-1, "-1");
 105                         CheckDouble (-1.1, "-1.1");
 106                         CheckDouble (1e-10, "1e-10");
 107                         CheckDouble (1e+10, "1e+10");
 108                         CheckDouble (1e-30, "1e-30");
 109                         CheckDouble (1e+30, "1e+30");
 110
 111                         CheckDouble (1, "\"1\"");
 112                         CheckDouble (1.1, "\"1.1\"");
 113                         CheckDouble (-1, "\"-1\"");
 114                         CheckDouble (-1.1, "\"-1.1\"");
 115
 116                         CheckDouble (double.NaN, "\"NaN\"");
 117                         CheckDouble (double.PositiveInfinity, "\"Infinity\"");
 118                         CheckDouble (double.NegativeInfinity, "\"-Infinity\"");
 119
 120                         ExpectError ("NaN");
 121                         ExpectError ("Infinity");
 122                         ExpectError ("-Infinity");
 123
 124                         Assert.AreEqual ("1.1", new JsonPrimitive (1.1).ToString ());
 125                         Assert.AreEqual ("-1.1", new JsonPrimitive (-1.1).ToString ());
 126                         Assert.AreEqual ("1E-20", new JsonPrimitive (1e-20).ToString ());
 127                         Assert.AreEqual ("1E+20", new JsonPrimitive (1e+20).ToString ());
 128                         Assert.AreEqual ("1E-30", new JsonPrimitive (1e-30).ToString ());
 129                         Assert.AreEqual ("1E+30", new JsonPrimitive (1e+30).ToString ());
 130                         Assert.AreEqual ("\"NaN\"", new JsonPrimitive (double.NaN).ToString ());
 131                         Assert.AreEqual ("\"Infinity\"", new JsonPrimitive (double.PositiveInfinity).ToString ());
 132                         Assert.AreEqual ("\"-Infinity\"", new JsonPrimitive (double.NegativeInfinity).ToString ());
 133
 134                         Assert.AreEqual ("1E-30", JsonValue.Parse ("1e-30").ToString ());
 135                         Assert.AreEqual ("1E+30", JsonValue.Parse ("1e+30").ToString ());
 136
 137                         CheckDouble (1);
 138                         CheckDouble (1.1);
 139                         CheckDouble (1.25);
 140                         CheckDouble (-1);
 141                         CheckDouble (-1.1);
 142                         CheckDouble (-1.25);
 143                         CheckDouble (1e-20);
 144                         CheckDouble (1e+20);
 145                         CheckDouble (1e-30);
 146                         CheckDouble (1e+30);
 147                         CheckDouble (3.1415926535897932384626433);
 148                         CheckDouble (3.1415926535897932384626433e-20);
 149                         CheckDouble (3.1415926535897932384626433e+20);
 150                         CheckDouble (double.NaN);
 151                         CheckDouble (double.PositiveInfinity);
 152                         CheckDouble (double.NegativeInfinity);
 153                         CheckDouble (double.MinValue);
 154                         CheckDouble (double.MaxValue);
 155
 156                         // 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)
 157                         CheckDouble (18014398509481982.0);
 158
 159                         // Values around the smallest positive decimal value
 160                         CheckDouble (1.123456789e-29);
 161                         CheckDouble (1.123456789e-28);
 162
 163                         CheckDouble (1.1E-29, "0.000000000000000000000000000011");
 164                         // This is being parsed as a decimal and rounded to 1e-28, even though it can be more accurately be represented by a double
 165                         //CheckDouble (1.1E-28, "0.00000000000000000000000000011");
 166                 }
 167
 168                 // Retry the test with different locales
 169                 [Test]
 170                 public void CheckNumbersCulture ()
 171                 {
 172                         CultureInfo old = Thread.CurrentThread.CurrentCulture;
 173                         try {
 174                                 Thread.CurrentThread.CurrentCulture = new CultureInfo ("en");
 175                                 CheckNumbers ();
 176                                 Thread.CurrentThread.CurrentCulture = new CultureInfo ("fr");
 177                                 CheckNumbers ();
 178                                 Thread.CurrentThread.CurrentCulture = new CultureInfo ("de");
 179                                 CheckNumbers ();
 180                         } finally {
 181                                 Thread.CurrentThread.CurrentCulture = old;
 182                         }
 183                 }
 184
 185                 // Convert a string to json and parse the string, then compare the result to the original value
 186                 void CheckString (string str)
 187                 {
 188                         var json = new JsonPrimitive (str).ToString ();
 189                         // Check whether the string is valid Unicode (will throw for broken surrogate pairs)
 190                         new UTF8Encoding (false, true).GetBytes (json);
 191                         string jvalue = (string) JsonValue.Parse (json);
 192                         Assert.AreEqual (str, jvalue);
 193                 }
 194
 195                 // String handling: http://tools.ietf.org/html/rfc7159#section-7
 196                 [Test]
 197                 public void CheckStrings ()
 198                 {
 199                         Assert.AreEqual ("\"test\"", new JsonPrimitive ("test").ToString ());
 200                         // Handling of characters
 201                         Assert.AreEqual ("\"f\"", new JsonPrimitive ('f').ToString ());
 202                         Assert.AreEqual ('f', (char) JsonValue.Parse ("\"f\""));
 203
 204                         // Control characters with special escape sequence
 205                         Assert.AreEqual ("\"\\b\\f\\n\\r\\t\"", new JsonPrimitive ("\b\f\n\r\t").ToString ());
 206                         // Other characters which must be escaped
 207                         Assert.AreEqual (@"""\""\\""", new JsonPrimitive ("\"\\").ToString ());
 208                         // Control characters without special escape sequence
 209                         for (int i = 0; i < 32; i++)
 210                                 if (i != '\b' && i != '\f' && i != '\n' && i != '\r' && i != '\t')
 211                                         Assert.AreEqual ("\"\\u" + i.ToString ("x04") + "\"", new JsonPrimitive ("" + (char) i).ToString ());
 212
 213                         // JSON does not require U+2028 and U+2029 to be escaped, but
 214                         // JavaScript does require this:
 215                         // http://stackoverflow.com/questions/2965293/javascript-parse-error-on-u2028-unicode-character/9168133#9168133
 216                         Assert.AreEqual ("\"\\u2028\\u2029\"", new JsonPrimitive ("\u2028\u2029").ToString ());
 217
 218                         // '/' also does not have to be escaped, but escaping it when
 219                         // preceeded by a '<' avoids problems with JSON in HTML <script> tags
 220                         Assert.AreEqual ("\"<\\/\"", new JsonPrimitive ("</").ToString ());
 221                         // Don't escape '/' in other cases as this makes the JSON hard to read
 222                         Assert.AreEqual ("\"/bar\"", new JsonPrimitive ("/bar").ToString ());
 223                         Assert.AreEqual ("\"foo/bar\"", new JsonPrimitive ("foo/bar").ToString ());
 224
 225                         CheckString ("test\b\f\n\r\t\"\\/</\0x");
 226                         for (int i = 0; i < 65536; i++)
 227                                 CheckString ("x" + ((char) i));
 228
 229                         // Check broken surrogate pairs
 230                         CheckString ("\ud800");
 231                         CheckString ("x\ud800");
 232                         CheckString ("\udfff\ud800");
 233                         CheckString ("\ude03\ud912");
 234                         CheckString ("\uc000\ubfff");
 235                         CheckString ("\udfffx");
 236                         // Valid strings should not be escaped:
 237                         Assert.AreEqual ("\"\ud7ff\"", new JsonPrimitive ("\ud7ff").ToString ());
 238                         Assert.AreEqual ("\"\ue000\"", new JsonPrimitive ("\ue000").ToString ());
 239                         Assert.AreEqual ("\"\ud800\udc00\"", new JsonPrimitive ("\ud800\udc00").ToString ());
 240                         Assert.AreEqual ("\"\ud912\ude03\"", new JsonPrimitive ("\ud912\ude03").ToString ());
 241                         Assert.AreEqual ("\"\udbff\udfff\"", new JsonPrimitive ("\udbff\udfff").ToString ());
 242                 }
 243         }
 244 }