class/System.Core/Test/System.Linq.Expressions/ExpressionTest_TypeAs.cs

   1 //
   2 // ExpressionTest_TypeAs.cs
   3 //
   4 // Author:
   5 //   Federico Di Gregorio <fog@initd.org>
   6 //   Jb Evain (jbevain@novell.com)
   7 //
   8 // (C) 2008 Novell, Inc. (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System;
  31 using System.Reflection;
  32 using System.Linq;
  33 using System.Linq.Expressions;
  34 using NUnit.Framework;
  35
  36 namespace MonoTests.System.Linq.Expressions
  37 {
  38         [TestFixture]
  39         public class ExpressionTest_TypeAs
  40         {
  41                 [Test]
  42                 [ExpectedException (typeof (ArgumentNullException))]
  43                 public void Arg1Null ()
  44                 {
  45                         Expression.TypeAs (null, typeof (int));
  46                 }
  47
  48                 [Test]
  49                 [ExpectedException (typeof (ArgumentNullException))]
  50                 public void Arg2Null ()
  51                 {
  52                         Expression.TypeAs (Expression.Constant (1), null);
  53                 }
  54
  55                 [Test]
  56                 [ExpectedException (typeof (ArgumentException))]
  57                 public void Arg2NotReferenceNorNullable ()
  58                 {
  59                         Expression.TypeAs (Expression.Constant (1), typeof (int));
  60                 }
  61
  62                 [Test]
  63                 public void NullableNumeric ()
  64                 {
  65                         UnaryExpression expr = Expression.TypeAs (Expression.Constant (1), typeof (int?));
  66                         Assert.AreEqual (ExpressionType.TypeAs, expr.NodeType, "TypeAs#01");
  67                         Assert.AreEqual (typeof (int?), expr.Type, "TypeAs#02");
  68                         Assert.AreEqual ("(1 As Nullable`1)", expr.ToString(), "TypeAs#03");
  69                 }
  70
  71                 [Test]
  72                 public void String ()
  73                 {
  74                         UnaryExpression expr = Expression.TypeAs (Expression.Constant (1), typeof (string));
  75                         Assert.AreEqual (ExpressionType.TypeAs, expr.NodeType, "TypeAs#04");
  76                         Assert.AreEqual (typeof (string), expr.Type, "TypeAs#05");
  77                         Assert.AreEqual ("(1 As String)", expr.ToString(), "TypeAs#06");
  78                 }
  79
  80                 [Test]
  81                 public void UserDefinedClass ()
  82                 {
  83                         UnaryExpression expr = Expression.TypeAs (Expression.Constant (new OpClass()), typeof (OpClass));
  84                         Assert.AreEqual (ExpressionType.TypeAs, expr.NodeType, "TypeAs#07");
  85                         Assert.AreEqual (typeof (OpClass), expr.Type, "TypeAs#08");
  86                         Assert.AreEqual ("(value(MonoTests.System.Linq.Expressions.OpClass) As OpClass)", expr.ToString(), "TypeAs#09");
  87                 }
  88
  89                 static Func<object, TType> CreateTypeAs<TType> ()
  90                 {
  91                         var obj = Expression.Parameter (typeof (object), "obj");
  92
  93                         return Expression.Lambda<Func<object, TType>> (
  94                                 Expression.TypeAs (obj, typeof (TType)), obj).Compile ();
  95                 }
  96
  97                 struct Foo {
  98                 }
  99
 100                 class Bar {
 101                 }
 102
 103                 class Baz : Bar {
 104                 }
 105
 106                 [Test]
 107                 public void CompiledTypeAs ()
 108                 {
 109                         var asbar = CreateTypeAs<Bar> ();
 110                         var asbaz = CreateTypeAs<Baz> ();
 111
 112                         Assert.IsNotNull (asbar (new Bar ()));
 113                         Assert.IsNull (asbar (new Foo ()));
 114                         Assert.IsNotNull (asbar (new Baz ()));
 115                         Assert.IsNull (asbaz (new Bar ()));
 116                 }
 117
 118                 [Test]
 119                 [ExpectedException (typeof (ArgumentException))]
 120                 public void TypeAsVoid ()
 121                 {
 122                         Expression.TypeAs ("yoyo".ToConstant (), typeof (void));
 123                 }
 124         }
 125 }