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

   1 //
   2 // ExpressionTest.cs
   3 //
   4 // Author:
   5 //   Jb Evain (jbevain@novell.com)
   6 //
   7 // (C) 2008 Novell, Inc. (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.Collections.Generic;
  31 using System.Reflection;
  32 using System.Runtime.CompilerServices;
  33 using System.Linq;
  34 using System.Linq.Expressions;
  35
  36 using NUnit.Framework;
  37
  38 namespace MonoTests.System.Linq.Expressions {
  39
  40         [TestFixture]
  41         public class ExpressionTest {
  42
  43                 [Test]
  44                 [ExpectedException (typeof (ArgumentNullException))]
  45                 public void GetFuncTypeArgNull ()
  46                 {
  47                         Expression.GetFuncType (null);
  48                 }
  49
  50                 static Type [] GetTestTypeArray (int length)
  51                 {
  52                         return Enumerable.Range (0, length - 1)
  53                                 .Select (i => typeof (int))
  54                                 .ToArray ();
  55                 }
  56
  57                 [Test]
  58                 [ExpectedException (typeof (ArgumentException))]
  59                 public void GetFuncTypeArgEmpty ()
  60                 {
  61                         Expression.GetFuncType (Type.EmptyTypes);
  62                 }
  63
  64                 [Test]
  65                 [ExpectedException (typeof (ArgumentException))]
  66                 public void GetFuncTypeArgTooBig ()
  67                 {
  68                         Expression.GetFuncType (GetTestTypeArray (64));
  69                 }
  70
  71                 [Test]
  72                 public void GetFuncTypeTest ()
  73                 {
  74                         var func = Expression.GetFuncType (new [] {typeof (int)});
  75                         Assert.AreEqual (typeof (Func<int>), func);
  76
  77                         func = Expression.GetFuncType (new [] {typeof (int), typeof (int)});
  78                         Assert.AreEqual (typeof (Func<int, int>), func);
  79
  80                         func = Expression.GetFuncType (new [] {typeof (int), typeof (int), typeof (int)});
  81                         Assert.AreEqual (typeof (Func<int, int, int>), func);
  82
  83                         func = Expression.GetFuncType (new [] {typeof (int), typeof (int), typeof (int), typeof (int)});
  84                         Assert.AreEqual (typeof (Func<int, int, int, int>), func);
  85
  86                         func = Expression.GetFuncType (new [] {typeof (int), typeof (int), typeof (int), typeof (int), typeof (int)});
  87                         Assert.AreEqual (typeof (Func<int, int, int, int, int>), func);
  88                 }
  89
  90                 [Test]
  91                 [ExpectedException (typeof (ArgumentNullException))]
  92                 public void GetActionTypeArgNull ()
  93                 {
  94                         Expression.GetActionType (null);
  95                 }
  96
  97                 [Test]
  98                 [ExpectedException (typeof (ArgumentException))]
  99                 public void GetActionTypeArgTooBig ()
 100                 {
 101                         Expression.GetActionType (GetTestTypeArray (45));
 102                 }
 103
 104                 [Test]
 105                 public void GetActionTypeTest ()
 106                 {
 107                         var action = Expression.GetActionType (new Type [0]);
 108                         Assert.AreEqual (typeof (Action), action);
 109
 110                         action = Expression.GetActionType (new [] {typeof (int)});
 111                         Assert.AreEqual (typeof (Action<int>), action);
 112
 113                         action = Expression.GetActionType (new [] {typeof (int), typeof (int)});
 114                         Assert.AreEqual (typeof (Action<int, int>), action);
 115
 116                         action = Expression.GetActionType (new [] {typeof (int), typeof (int), typeof (int)});
 117                         Assert.AreEqual (typeof (Action<int, int, int>), action);
 118
 119                         action = Expression.GetActionType (new [] {typeof (int), typeof (int), typeof (int), typeof (int)});
 120                         Assert.AreEqual (typeof (Action<int, int, int, int>), action);
 121                 }
 122
 123                 [Test]
 124                 [ExpectedException (typeof (ArgumentNullException))]
 125                 public void ParameterNullType ()
 126                 {
 127                         Expression.Parameter (null, "foo");
 128                 }
 129
 130                 [Test]
 131                 public void ParameterNullName ()
 132                 {
 133                         var p = Expression.Parameter (typeof (string), null);
 134                         Assert.AreEqual (null, p.Name);
 135                         Assert.AreEqual (typeof (string), p.Type);
 136                 }
 137
 138                 [Test]
 139                 public void ParameterEmptyName ()
 140                 {
 141                         var p = Expression.Parameter (typeof (string), "");
 142                         Assert.AreEqual ("", p.Name);
 143                         Assert.AreEqual (typeof (string), p.Type);
 144                 }
 145
 146                 [Test]
 147                 public void Parameter ()
 148                 {
 149                         var p = Expression.Parameter (typeof (string), "foo");
 150                         Assert.AreEqual ("foo", p.Name);
 151                         Assert.AreEqual (typeof (string), p.Type);
 152                         Assert.AreEqual ("foo", p.ToString ());
 153                 }
 154
 155                 [Test]
 156                 [Category ("NotDotNet")]
 157                 [ExpectedException (typeof (ArgumentException))]
 158                 public void VoidParameter ()
 159                 {
 160                         Expression.Parameter (typeof (void), "hello");
 161                 }
 162
 163                 static int buffer;
 164
 165                 public static int Identity (int i)
 166                 {
 167                         buffer = i;
 168                         return i;
 169                 }
 170
 171                 [Test]
 172                 public void CompileActionDiscardingRetValue ()
 173                 {
 174                         var p = Expression.Parameter (typeof (int), "i");
 175                         var identity = GetType ().GetMethod ("Identity", BindingFlags.Static | BindingFlags.Public );
 176                         Assert.IsNotNull (identity);
 177
 178                         var lambda = Expression.Lambda<Action<int>> (Expression.Call (identity, p), p);
 179
 180                         var method = lambda.Compile ();
 181
 182                         buffer = 0;
 183
 184                         method (42);
 185                         Assert.AreEqual (42, buffer);
 186                 }
 187
 188                 [Test]
 189                 public void ExpressionDelegateTarget ()
 190                 {
 191                         var p = Expression.Parameter (typeof (string), "str");
 192                         var identity = Expression.Lambda<Func<string, string>> (p, p).Compile ();
 193
 194                         Assert.AreEqual (typeof (Func<string, string>), identity.GetType ());
 195                         Assert.IsNotNull (identity.Target);
 196                 }
 197
 198                 class Foo {
 199                         public string gazonk;
 200                 }
 201
 202                 struct Bar {
 203                         public int baz;
 204
 205                         public override string ToString ()
 206                         {
 207                                 return baz.ToString ();
 208                         }
 209                 }
 210
 211
 212                 [Test]
 213                 public void SimpleHoistedParameter ()
 214                 {
 215                         var p = Expression.Parameter (typeof (string), "s");
 216
 217                         var f = Expression.Lambda<Func<string, Func<string>>> (
 218                                 Expression.Lambda<Func<string>> (
 219                                         p,
 220                                         new ParameterExpression [0]),
 221                                 p).Compile ();
 222
 223                         var f2 = f ("x");
 224
 225                         Assert.AreEqual ("x", f2 ());
 226                 }
 227
 228                 [Test]
 229                 public void TwoHoistingLevels ()
 230                 {
 231                         var p1 = Expression.Parameter (typeof (string), "x");
 232                         var p2 = Expression.Parameter (typeof (string), "y");
 233
 234                         Expression<Func<string, Func<string, Func<string>>>> e =
 235                                 Expression.Lambda<Func<string, Func<string, Func<string>>>> (
 236                                         Expression.Lambda<Func<string, Func<string>>> (
 237                                                 Expression.Lambda<Func<string>> (
 238                                                         Expression.Call (
 239                                                                 typeof (string).GetMethod ("Concat", new [] { typeof (string), typeof (string) }),
 240                                                                 new [] { p1, p2 }),
 241                                                         new ParameterExpression [0]),
 242                                                 new [] { p2 }),
 243                                         new [] { p1 });
 244
 245                         var f = e.Compile ();
 246                         var f2 = f ("Hello ");
 247                         var f3 = f2 ("World !");
 248
 249                         Assert.AreEqual ("Hello World !", f3 ());
 250                 }
 251
 252                 [Test]
 253                 public void HoistedParameter ()
 254                 {
 255                         var i = Expression.Parameter (typeof (int), "i");
 256
 257                         var l = Expression.Lambda<Func<int, string>> (
 258                                 Expression.Invoke (
 259                                         Expression.Lambda<Func<string>> (
 260                                                 Expression.Call (i, typeof (int).GetMethod ("ToString", Type.EmptyTypes)))), i).Compile ();
 261
 262                         Assert.AreEqual ("42", l (42));
 263                 }
 264         }
 265 }