class/corlib/Test/System/ObjectTest.cs

   1 // ObjectTest.cs - NUnit Test Cases for the System.Object struct
   2 //
   3 // David Brandt (bucky@keystreams.com)
   4 //
   5 // (C) Ximian, Inc.  http://www.ximian.com
   6 //
   7
   8 using NUnit.Framework;
   9 using System;
  10 using System.Globalization;
  11
  12 namespace MonoTests.System
  13 {
  14
  15 public class ObjectTest
  16 {
  17         public ObjectTest() {}
  18
  19         [Test]
  20         public void TestCtor() {
  21                 Object o = new Object();
  22                 Assert.IsNotNull(o, "Can I at least get an _Object_, please?");
  23         }
  24
  25         [Test]
  26         public void TestEquals1() {
  27                 {
  28                         Object x = new Object();
  29                         Object y = new Object();
  30                         Assert.IsTrue(x.Equals(x), "Object should equal itself");
  31
  32                         Assert.IsTrue(!x.Equals(null), "object should not equal null");
  33
  34                         Assert.IsTrue(!x.Equals(y), "Different objects should not equal 1");
  35
  36                         Assert.IsTrue(!y.Equals(x), "Different objects should not equal 2");
  37
  38                 }
  39                 {
  40                         double x = Double.NaN;
  41                         double y = Double.NaN;
  42                         Assert.IsTrue(((Object)x).Equals(y), "NaNs should always equal each other");
  43
  44                 }
  45         }
  46
  47         [Test]
  48         public void TestEquals2() {
  49                 {
  50                         Object x = new Object();
  51                         Object y = new Object();
  52                         Assert.IsTrue(Object.Equals(x,x), "Object should equal itself");
  53
  54                         Assert.IsTrue(!Object.Equals(x,null), "object should not equal null");
  55
  56                         Assert.IsTrue(!Object.Equals(null,x), "null should not equal object");
  57
  58                         Assert.IsTrue(!Object.Equals(x,y), "Different objects should not equal 1");
  59
  60                         Assert.IsTrue(!Object.Equals(y,x), "Different objects should not equal 2");
  61
  62                         Assert.IsTrue(Object.Equals(null,null), "null should equal null");
  63
  64                 }
  65                 {
  66                         double x = Double.NaN;
  67                         double y = Double.NaN;
  68                         Assert.IsTrue(Object.Equals(x,y), "NaNs should always equal each other");
  69
  70                 }
  71         }
  72
  73         [Test]
  74         public void TestGetHashCode() {
  75                 Object x = new Object();
  76                 Assert.AreEqual(x.GetHashCode(), x.GetHashCode(), "Object's hash code should not change");
  77         }
  78
  79         [Test]
  80         public void TestGetType() {
  81                 Object x = new Object();
  82                 Assert.IsNotNull(x.GetType(), "Should get a type for Object");
  83                 Assert.AreEqual(x.GetType().ToString(), "System.Object", "Bad name for Object type");
  84
  85         }
  86
  87         [Test]
  88         public void TestReferenceEquals() {
  89                 Object x = new Object();
  90                 Object y = new Object();
  91                 Assert.IsTrue(Object.ReferenceEquals(x,x), "Object should equal itself");
  92
  93                 Assert.IsTrue(!Object.ReferenceEquals(x,null), "object should not equal null");
  94
  95                 Assert.IsTrue(!Object.ReferenceEquals(null,x), "null should not equal object");
  96
  97                 Assert.IsTrue(!Object.ReferenceEquals(x,y), "Different objects should not equal 1");
  98
  99                 Assert.IsTrue(!Object.ReferenceEquals(y,x), "Different objects should not equal 2");
 100
 101                 Assert.IsTrue(Object.ReferenceEquals(null,null), "null should not equal null");
 102
 103         }
 104
 105         [Test]
 106         public void TestToString() {
 107                 Object x = new Object();
 108                 Object y = new Object();
 109                 Assert.AreEqual(x.ToString(), y.ToString(), "All Objects should have same string rep");
 110         }
 111 #if NET_2_0
 112         class Foo<T> {}
 113
 114         [Test]
 115         public void TestToStringOnGenericInstances ()
 116         {
 117                 Foo<Object> foo = new Foo<Object> ();
 118                 Assert.AreEqual ("MonoTests.System.ObjectTest+Foo`1[System.Object]", foo.ToString (), "Bad ToString of generic instance");
 119
 120         }
 121 #endif
 122 }
 123 }