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                 [Test]
  51                 [ExpectedException (typeof (ArgumentException))]
  52                 public void GetFuncTypeArgEmpty ()
  53                 {
  54                         Expression.GetFuncType (new Type [0]);
  55                 }
  56
  57                 [Test]
  58                 [ExpectedException (typeof (ArgumentException))]
  59                 public void GetFuncTypeArgTooBig ()
  60                 {
  61                         Expression.GetFuncType (new Type [6]);
  62                 }
  63
  64                 [Test]
  65                 public void GetFuncTypeTest ()
  66                 {
  67                         var func = Expression.GetFuncType (new [] {typeof (int)});
  68                         Assert.AreEqual (typeof (Func<int>), func);
  69
  70                         func = Expression.GetFuncType (new [] {typeof (int), typeof (int)});
  71                         Assert.AreEqual (typeof (Func<int, int>), func);
  72
  73                         func = Expression.GetFuncType (new [] {typeof (int), typeof (int), typeof (int)});
  74                         Assert.AreEqual (typeof (Func<int, int, int>), func);
  75
  76                         func = Expression.GetFuncType (new [] {typeof (int), typeof (int), typeof (int), typeof (int)});
  77                         Assert.AreEqual (typeof (Func<int, int, int, int>), func);
  78
  79                         func = Expression.GetFuncType (new [] {typeof (int), typeof (int), typeof (int), typeof (int), typeof (int)});
  80                         Assert.AreEqual (typeof (Func<int, int, int, int, int>), func);
  81                 }
  82
  83                 [Test]
  84                 [ExpectedException (typeof (ArgumentNullException))]
  85                 public void GetActionTypeArgNull ()
  86                 {
  87                         Expression.GetActionType (null);
  88                 }
  89
  90                 [Test]
  91                 [ExpectedException (typeof (ArgumentException))]
  92                 public void GetActionTypeArgTooBig ()
  93                 {
  94                         Expression.GetActionType (new Type [5]);
  95                 }
  96
  97                 [Test]
  98                 public void GetActionTypeTest ()
  99                 {
 100                         var action = Expression.GetActionType (new Type [0]);
 101                         Assert.AreEqual (typeof (Action), action);
 102
 103                         action = Expression.GetActionType (new [] {typeof (int)});
 104                         Assert.AreEqual (typeof (Action<int>), action);
 105
 106                         action = Expression.GetActionType (new [] {typeof (int), typeof (int)});
 107                         Assert.AreEqual (typeof (Action<int, int>), action);
 108
 109                         action = Expression.GetActionType (new [] {typeof (int), typeof (int), typeof (int)});
 110                         Assert.AreEqual (typeof (Action<int, int, int>), action);
 111
 112                         action = Expression.GetActionType (new [] {typeof (int), typeof (int), typeof (int), typeof (int)});
 113                         Assert.AreEqual (typeof (Action<int, int, int, int>), action);
 114                 }
 115
 116                 [Test]
 117                 [ExpectedException (typeof (ArgumentNullException))]
 118                 public void ParameterNullType ()
 119                 {
 120                         Expression.Parameter (null, "foo");
 121                 }
 122
 123                 [Test]
 124                 public void ParameterNullName ()
 125                 {
 126                         var p = Expression.Parameter (typeof (string), null);
 127                         Assert.AreEqual (null, p.Name);
 128                         Assert.AreEqual (typeof (string), p.Type);
 129                         Assert.AreEqual ("<param>", p.ToString ());
 130                 }
 131
 132                 [Test]
 133                 public void ParameterEmptyName ()
 134                 {
 135                         var p = Expression.Parameter (typeof (string), "");
 136                         Assert.AreEqual ("", p.Name);
 137                         Assert.AreEqual (typeof (string), p.Type);
 138                         Assert.AreEqual ("", p.ToString ());
 139                 }
 140
 141                 [Test]
 142                 public void Parameter ()
 143                 {
 144                         var p = Expression.Parameter (typeof (string), "foo");
 145                         Assert.AreEqual ("foo", p.Name);
 146                         Assert.AreEqual (typeof (string), p.Type);
 147                         Assert.AreEqual ("foo", p.ToString ());
 148                 }
 149
 150                 [Test]
 151                 [Category ("NotDotNet")]
 152                 [ExpectedException (typeof (ArgumentException))]
 153                 public void VoidParameter ()
 154                 {
 155                         Expression.Parameter (typeof (void), "hello");
 156                 }
 157
 158                 static int buffer;
 159
 160                 public static int Identity (int i)
 161                 {
 162                         buffer = i;
 163                         return i;
 164                 }
 165
 166                 [Test]
 167                 public void CompileActionDiscardingRetValue ()
 168                 {
 169                         var p = Expression.Parameter (typeof (int), "i");
 170                         var identity = GetType ().GetMethod ("Identity", BindingFlags.Static | BindingFlags.Public );
 171                         Assert.IsNotNull (identity);
 172
 173                         var lambda = Expression.Lambda<Action<int>> (Expression.Call (identity, p), p);
 174
 175                         var method = lambda.Compile ();
 176
 177                         buffer = 0;
 178
 179                         method (42);
 180                         Assert.AreEqual (42, buffer);
 181                 }
 182
 183                 [Test]
 184                 [Category("TargetJvmNotSupported")]
 185                 public void ExpressionDelegateTarget ()
 186                 {
 187                         var p = Expression.Parameter (typeof (string), "str");
 188                         var identity = Expression.Lambda<Func<string, string>> (p, p).Compile ();
 189
 190                         Assert.AreEqual (typeof (Func<string, string>), identity.GetType ());
 191                         Assert.IsNotNull (identity.Target);
 192                         Assert.AreEqual (typeof (ExecutionScope), identity.Target.GetType ());
 193                 }
 194
 195                 class Foo {
 196                         public string gazonk;
 197                 }
 198
 199                 struct Bar {
 200                         public int baz;
 201
 202                         public override string ToString ()
 203                         {
 204                                 return baz.ToString ();
 205                         }
 206                 }
 207
 208                 [Test]
 209                 [Category ("TargetJvmNotSupported")]
 210                 public void GlobalsInScope ()
 211                 {
 212                         var foo = new Foo { gazonk = "gazonk" };
 213                         var bar = new Bar { baz = 42 };
 214
 215                         var l = Expression.Lambda<Func<string>> (
 216                                 Expression.Call (
 217                                         typeof (string).GetMethod ("Concat", new [] { typeof (string), typeof (string) }),
 218                                         Expression.Field (Expression.Constant (foo), typeof (Foo).GetField ("gazonk")),
 219                                         Expression.Call (Expression.Constant (bar), typeof (Bar).GetMethod ("ToString"))));
 220
 221                         var del = l.Compile ();
 222
 223                         var scope = del.Target as ExecutionScope;
 224
 225                         Assert.IsNotNull (scope);
 226
 227                         var globals = scope.Globals;
 228
 229                         Assert.IsNotNull (globals);
 230
 231                         Assert.AreEqual (2, globals.Length);
 232                         Assert.AreEqual (typeof (StrongBox<Foo>), globals [0].GetType ());
 233                         Assert.AreEqual (typeof (StrongBox<Bar>), globals [1].GetType ());
 234
 235                         Assert.AreEqual (foo, ((StrongBox<Foo>) globals [0]).Value);
 236                         Assert.AreEqual (bar, ((StrongBox<Bar>) globals [1]).Value);
 237
 238                         Assert.AreEqual ("gazonk42", del ());
 239                 }
 240
 241                 [Test]
 242                 public void SimpleHoistedParameter ()
 243                 {
 244                         var p = Expression.Parameter (typeof (string), "s");
 245
 246                         var f = Expression.Lambda<Func<string, Func<string>>> (
 247                                 Expression.Lambda<Func<string>> (
 248                                         p,
 249                                         new ParameterExpression [0]),
 250                                 p).Compile ();
 251
 252                         var f2 = f ("x");
 253
 254                         Assert.AreEqual ("x", f2 ());
 255                 }
 256
 257                 [Test]
 258                 public void TwoHoistingLevels ()
 259                 {
 260                         var p1 = Expression.Parameter (typeof (string), "x");
 261                         var p2 = Expression.Parameter (typeof (string), "y");
 262
 263                         Expression<Func<string, Func<string, Func<string>>>> e =
 264                                 Expression.Lambda<Func<string, Func<string, Func<string>>>> (
 265                                         Expression.Lambda<Func<string, Func<string>>> (
 266                                                 Expression.Lambda<Func<string>> (
 267                                                         Expression.Call (
 268                                                                 typeof (string).GetMethod ("Concat", new [] { typeof (string), typeof (string) }),
 269                                                                 new [] { p1, p2 }),
 270                                                         new ParameterExpression [0]),
 271                                                 new [] { p2 }),
 272                                         new [] { p1 });
 273
 274                         var f = e.Compile ();
 275                         var f2 = f ("Hello ");
 276                         var f3 = f2 ("World !");
 277
 278                         Assert.AreEqual ("Hello World !", f3 ());
 279                 }
 280
 281                 [Test]
 282                 public void HoistedParameter ()
 283                 {
 284                         var i = Expression.Parameter (typeof (int), "i");
 285
 286                         var l = Expression.Lambda<Func<int, string>> (
 287                                 Expression.Invoke (
 288                                         Expression.Lambda<Func<string>> (
 289                                                 Expression.Call (i, typeof (int).GetMethod ("ToString", Type.EmptyTypes)))), i).Compile ();
 290
 291                         Assert.AreEqual ("42", l (42));
 292                 }
 293         }
 294 }