mcs/class/System.Core/Test/System.Linq.Expressions/ExpressionTest_Equal.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 //
  19 // Authors:
  20 //    Miguel de Icaza (miguel@novell.com)
  21 //
  22
  23 using System;
  24 using System.Reflection;
  25 using System.Linq;
  26 using System.Linq.Expressions;
  27 using NUnit.Framework;
  28
  29 namespace MonoTests.System.Linq.Expressions
  30 {
  31         [TestFixture]
  32         public class ExpressionTest_Equal
  33         {
  34                 [Test]
  35                 [ExpectedException (typeof (ArgumentNullException))]
  36                 public void Arg1Null ()
  37                 {
  38                         Expression.Equal (null, Expression.Constant (1));
  39                 }
  40
  41                 [Test]
  42                 [ExpectedException (typeof (ArgumentNullException))]
  43                 public void Arg2Null ()
  44                 {
  45                         Expression.Equal (Expression.Constant (1), null);
  46                 }
  47
  48                 [Test]
  49                 [ExpectedException (typeof (InvalidOperationException))]
  50                 public void ArgTypesDifferent ()
  51                 {
  52                         Expression.Equal (Expression.Constant (1), Expression.Constant (2.0));
  53                 }
  54
  55                 [Test]
  56                 public void ReferenceCompare ()
  57                 {
  58                         Expression.Equal (Expression.Constant (new NoOpClass ()), Expression.Constant (new NoOpClass ()));
  59                 }
  60
  61                 public struct D {
  62                 }
  63
  64                 [Test]
  65                 [ExpectedException (typeof (InvalidOperationException))]
  66                 public void NoOperatorClass ()
  67                 {
  68                         Expression.Equal (Expression.Constant (new D ()), Expression.Constant (new D ()));
  69                 }
  70
  71                 [Test]
  72                 public void Numeric ()
  73                 {
  74                         BinaryExpression expr = Expression.Equal (Expression.Constant (1), Expression.Constant (2));
  75                         Assert.AreEqual (ExpressionType.Equal, expr.NodeType);
  76                         Assert.AreEqual (typeof (bool), expr.Type);
  77                         Assert.IsNull (expr.Method);
  78                         Assert.AreEqual ("(1 = 2)", expr.ToString ());
  79                 }
  80
  81                 [Test]
  82                 public void Nullable_LiftToNull_SetToFalse ()
  83                 {
  84                         int? a = 1;
  85                         int? b = 2;
  86
  87                         BinaryExpression expr = Expression.Equal (Expression.Constant (a, typeof(int?)),
  88                                                                   Expression.Constant (b, typeof(int?)),
  89                                                                   false, null);
  90                         Assert.AreEqual (ExpressionType.Equal, expr.NodeType);
  91                         Assert.AreEqual (typeof (bool), expr.Type);
  92                         Assert.AreEqual (true, expr.IsLifted);
  93                         Assert.AreEqual (false, expr.IsLiftedToNull);
  94                         Assert.IsNull (expr.Method);
  95                         Assert.AreEqual ("(1 = 2)", expr.ToString ());
  96                 }
  97
  98                 [Test]
  99                 public void Nullable_LiftToNull_SetToTrue ()
 100                 {
 101                         int? a = 1;
 102                         int? b = 2;
 103
 104                         BinaryExpression expr = Expression.Equal (Expression.Constant (a, typeof(int?)),
 105                                                                   Expression.Constant (b, typeof(int?)),
 106                                                                   true, null);
 107                         Assert.AreEqual (ExpressionType.Equal, expr.NodeType);
 108                         Assert.AreEqual (typeof (bool?), expr.Type);
 109                         Assert.AreEqual (true, expr.IsLifted);
 110                         Assert.AreEqual (true, expr.IsLiftedToNull);
 111                         Assert.IsNull (expr.Method);
 112                         Assert.AreEqual ("(1 = 2)", expr.ToString ());
 113                 }
 114
 115                 [Test]
 116                 [ExpectedException(typeof (InvalidOperationException))]
 117                 public void Nullable_Mixed ()
 118                 {
 119                         int? a = 1;
 120                         int b = 2;
 121
 122                         BinaryExpression expr = Expression.Equal (Expression.Constant (a, typeof (int?)),
 123                                                                   Expression.Constant (b, typeof (int)));
 124                 }
 125
 126                 [Test]
 127                 public void UserDefinedClass ()
 128                 {
 129                         // We can use the simplest version of GetMethod because we already know only one
 130                         // exists in the very simple class we're using for the tests.
 131                         MethodInfo mi = typeof (OpClass).GetMethod ("op_Equality");
 132
 133                         BinaryExpression expr = Expression.Equal (Expression.Constant (new OpClass ()), Expression.Constant (new OpClass ()));
 134                         Assert.AreEqual (ExpressionType.Equal, expr.NodeType);
 135                         Assert.AreEqual (typeof (bool), expr.Type);
 136                         Assert.AreEqual (mi, expr.Method);
 137                         Assert.AreEqual ("op_Equality", expr.Method.Name);
 138
 139                         Assert.AreEqual ("(value(MonoTests.System.Linq.Expressions.OpClass) = value(MonoTests.System.Linq.Expressions.OpClass))", expr.ToString ());
 140                 }
 141
 142                 //
 143                 // Checks for the behavior when the return type for Equal is not
 144                 // bool, and its coping with nullable values.
 145                 //
 146                 [Test]
 147                 public void UserDefinedEqual ()
 148                 {
 149
 150                 }
 151
 152         }
 153 }