mcs/class/corlib/Test/System.Runtime.CompilerServices/RuntimeHelpersTest.cs

   1 //\r
   2 // RuntimeHelpersTest.cs - NUnit Test Cases for the System.Runtime.CompilerServices.RuntimeHelpers class\r
   3 //\r
   4 // Zoltan Varga (vargaz@freemail.hu)\r
   5 //\r
   6 // (C) Ximian, Inc.  http://www.ximian.com\r
   7 \r
   8 using System;\r
   9 using System.Runtime.CompilerServices;\r
  10 \r
  11 using NUnit.Framework;\r
  12 \r
  13 namespace MonoTests.System.Runtime.CompilerServices {\r
  14 \r
  15         [TestFixture]\r
  16         public class RuntimeHelpersTest : Assertion {\r
  17             struct FooStruct {\r
  18                         public int i;\r
  19                         public string j;\r
  20 \r
  21                         public override int GetHashCode () {\r
  22                                 return 5;\r
  23                         }\r
  24 \r
  25                         public override bool Equals (object o) {\r
  26                                 Fail ();\r
  27                                 return false;\r
  28                         }\r
  29                 }\r
  30 \r
  31                 class FooClass {\r
  32                         public static int counter = 0;\r
  33 \r
  34                         static FooClass () {\r
  35                                 counter = counter + 1;\r
  36                         }\r
  37 \r
  38                         public override int GetHashCode () {\r
  39                                 return 5;\r
  40                         }\r
  41 \r
  42                         public override bool Equals (object o) {\r
  43                                 Fail ();\r
  44                                 return true;\r
  45                         }\r
  46                 }\r
  47 \r
  48                 public void TestOffsetToStringData () \r
  49                 {\r
  50                         AssertEquals ("OffsetToStringData is not constant",\r
  51                                                   RuntimeHelpers.OffsetToStringData,\r
  52                                                   RuntimeHelpers.OffsetToStringData);\r
  53                 }\r
  54 \r
  55                 public void TestGetObjectValue ()\r
  56                 {\r
  57                         FooStruct s1;\r
  58                         FooStruct s2;\r
  59 \r
  60                         // Test null\r
  61                         AssertEquals ("",\r
  62                                                   RuntimeHelpers.GetObjectValue (null),\r
  63                                                   null);\r
  64                         \r
  65                         // Test non-valuetype\r
  66                         AssertEquals ("",\r
  67                                                   RuntimeHelpers.GetObjectValue (this),\r
  68                                                   this);\r
  69 \r
  70                         // Test valuetype\r
  71                         s1.i = 42;\r
  72                         s1.j = "FOO";\r
  73                         s2 = (FooStruct)RuntimeHelpers.GetObjectValue(s1);\r
  74                         s1.i = 43;\r
  75                         s1.j = "BAR";\r
  76                         AssertEquals ("", s2.i, 42);\r
  77                         AssertEquals ("", s2.j, "FOO");\r
  78                 }\r
  79 \r
  80                 public void TestRunClassConstructor ()\r
  81                 {\r
  82                         RuntimeHelpers.RunClassConstructor (typeof(FooClass).TypeHandle);\r
  83                         AssertEquals ("", FooClass.counter, 1);\r
  84 \r
  85                         // Each static constructor should only be run once\r
  86                         RuntimeHelpers.RunClassConstructor (typeof(FooClass).TypeHandle);\r
  87                         AssertEquals ("", FooClass.counter, 1);\r
  88                 }\r
  89 \r
  90 #if NET_1_1\r
  91                 public void TestGetHashCode ()\r
  92                 {\r
  93                         AssertEquals ("Null has hash code 0", 0, RuntimeHelpers.GetHashCode (null));\r
  94                         object o = new object ();\r
  95                         AssertEquals ("", o.GetHashCode (), RuntimeHelpers.GetHashCode (o));\r
  96                         Assert ("", 5 != RuntimeHelpers.GetHashCode (new FooClass ()));\r
  97                 }                       \r
  98 \r
  99                 public void TestEquals ()\r
 100                 {\r
 101                         Assert (RuntimeHelpers.Equals (null, null));\r
 102                         Assert (!RuntimeHelpers.Equals (new object (), null));\r
 103                         Assert (!RuntimeHelpers.Equals (null, new object ()));\r
 104 \r
 105                         FooStruct f1 = new FooStruct ();\r
 106                         f1.i = 5;\r
 107                         FooStruct f2 = new FooStruct ();\r
 108                         f2.i = 5;\r
 109                         object o1 = f1;\r
 110                         object o2 = o1;\r
 111                         object o3 = f2;\r
 112                         object o4 = "AAA";\r
 113                         Assert (RuntimeHelpers.Equals (o1, o2));\r
 114 \r
 115                         // This should do a bit-by-bit comparison for valuetypes\r
 116                         Assert (RuntimeHelpers.Equals (o1, o3));\r
 117                         Assert (!RuntimeHelpers.Equals (o1, o4));\r
 118                 }\r
 119 #endif\r
 120         }\r
 121 }\r