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

   1 //
   2 // ExpressionTest_Call.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.Collections.Generic;
  33 using System.Linq;
  34 using System.Linq.Expressions;
  35 using NUnit.Framework;
  36
  37 namespace MonoTests.System.Linq.Expressions {
  38
  39         [TestFixture]
  40         public class ExpressionTest_Call {
  41
  42                 [Test]
  43                 [ExpectedException (typeof (ArgumentNullException))]
  44                 public void Arg1Null ()
  45                 {
  46                         Expression.Call ((Type)null, "TestMethod", null, Expression.Constant (1));
  47                 }
  48
  49                 [Test]
  50                 [ExpectedException (typeof (ArgumentNullException))]
  51                 public void Arg2Null ()
  52                 {
  53                         Expression.Call (typeof (MemberClass), null, null, Expression.Constant (1));
  54                 }
  55
  56                 [Test]
  57                 [ExpectedException (typeof (InvalidOperationException))]
  58                 public void Arg4WrongType ()
  59                 {
  60                         Expression.Call (typeof (MemberClass), "StaticMethod", null, Expression.Constant (true));
  61                 }
  62
  63                 [Test]
  64                 [ExpectedException (typeof (InvalidOperationException))]
  65                 public void InstanceMethod ()
  66                 {
  67                         Expression.Call (typeof (MemberClass), "TestMethod", null, Expression.Constant (1));
  68                 }
  69
  70                 [Test]
  71                 public void StaticMethod ()
  72                 {
  73                         Expression.Call (typeof (MemberClass), "StaticMethod", null, Expression.Constant (1));
  74                 }
  75
  76                 [Test]
  77                 public void StaticGenericMethod ()
  78                 {
  79                         Expression.Call (typeof (MemberClass), "StaticGenericMethod", new [] { typeof (int) }, Expression.Constant (1));
  80                 }
  81
  82                 [Test]
  83                 [ExpectedException (typeof (ArgumentNullException))]
  84                 public void ArgMethodNull ()
  85                 {
  86                         Expression.Call (Expression.Constant (new object ()), null);
  87                 }
  88
  89                 [Test]
  90                 [ExpectedException (typeof (ArgumentNullException))]
  91                 public void ArgInstanceNullForNonStaticMethod ()
  92                 {
  93                         Expression.Call (null, typeof (object).GetMethod ("ToString"));
  94                 }
  95
  96                 [Test]
  97                 [ExpectedException (typeof (ArgumentException))]
  98                 public void InstanceTypeDoesntMatchMethodDeclaringType ()
  99                 {
 100                         Expression.Call (Expression.Constant (1), typeof (string).GetMethod ("Intern"));
 101                 }
 102
 103                 [Test]
 104                 [ExpectedException (typeof (ArgumentException))]
 105                 public void MethodArgumentCountDoesnMatchParameterLength ()
 106                 {
 107                         Expression.Call (Expression.Constant (new object ()), typeof (object).GetMethod ("ToString"), Expression.Constant (new object ()));
 108                 }
 109
 110                 public class Foo {
 111                         public void Bar (string s)
 112                         {
 113                         }
 114                 }
 115
 116                 [Test]
 117                 [ExpectedException (typeof (ArgumentNullException))]
 118                 public void MethodHasNullArgument ()
 119                 {
 120                         Expression.Call (Expression.New (typeof (Foo)), typeof (Foo).GetMethod ("Bar"), null as Expression);
 121                 }
 122
 123                 [Test]
 124                 [ExpectedException (typeof (ArgumentException))]
 125                 public void MethodArgumentDoesntMatchParameterType ()
 126                 {
 127                         Expression.Call (Expression.New (typeof (Foo)), typeof (Foo).GetMethod ("Bar"), Expression.Constant (42));
 128                 }
 129
 130                 [Test]
 131                 public void CallToString ()
 132                 {
 133                         var call = Expression.Call (Expression.Constant (new object ()), typeof (object).GetMethod ("ToString"));
 134                         Assert.AreEqual ("value(System.Object).ToString()", call.ToString ());
 135                 }
 136
 137                 [Test]
 138                 public void CallStringIsNullOrEmpty ()
 139                 {
 140                         var call = Expression.Call (null, typeof (string).GetMethod ("IsNullOrEmpty"), Expression.Constant (""));
 141                         Assert.AreEqual ("IsNullOrEmpty(\"\")", call.ToString ());
 142                 }
 143
 144                 [Test]
 145                 [Category ("NotDotNet")] // http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=339351
 146                 [ExpectedException (typeof (ArgumentException))]
 147                 public void CallStaticMethodWithInstanceArgument ()
 148                 {
 149                         Expression.Call (
 150                                 Expression.Parameter (GetType (), "t"),
 151                                 GetType ().GetMethod ("Identity"),
 152                                 Expression.Constant (null));
 153                 }
 154
 155                 public static object Identity (object o)
 156                 {
 157                         return o;
 158                 }
 159
 160                 [Test]
 161                 public void CompileSimpleStaticCall ()
 162                 {
 163                         var p = Expression.Parameter (typeof (object), "o");
 164                         var lambda = Expression.Lambda<Func<object, object>> (Expression.Call (GetType ().GetMethod ("Identity"), p), p);
 165
 166                         var i = lambda.Compile ();
 167
 168                         Assert.AreEqual (2, i (2));
 169                         Assert.AreEqual ("Foo", i ("Foo"));
 170                 }
 171
 172                 [Test]
 173                 public void CompileSimpleInstanceCall ()
 174                 {
 175                         var p = Expression.Parameter (typeof (string), "p");
 176                         var lambda = Expression.Lambda<Func<string, string>> (
 177                                 Expression.Call (
 178                                         p, typeof (string).GetMethod ("ToString", Type.EmptyTypes)),
 179                                 p);
 180
 181                         var ts = lambda.Compile ();
 182
 183                         Assert.AreEqual ("foo", ts ("foo"));
 184                         Assert.AreEqual ("bar", ts ("bar"));
 185                 }
 186
 187                 [Test]
 188                 [ExpectedException (typeof (InvalidOperationException))]
 189                 public void CheckTypeArgsIsNotUsedForParameterLookup ()
 190                 {
 191                         Expression.Call (GetType (), "EineMethod", new [] { typeof (string), typeof (int) }, "foo".ToConstant (), 2.ToConstant ());
 192                 }
 193
 194                 public static void EineGenericMethod<X, Y> (string foo, int bar)
 195                 {
 196                 }
 197
 198                 [Test]
 199                 public void CheckTypeArgsIsUsedForGenericArguments ()
 200                 {
 201                         var m = Expression.Call (GetType (), "EineGenericMethod", new [] { typeof (string), typeof (int) }, "foo".ToConstant (), 2.ToConstant ());
 202                         Assert.IsNotNull (m.Method);
 203                         Assert.AreEqual ("Void EineGenericMethod[String,Int32](System.String, Int32)", m.Method.ToString ());
 204                 }
 205
 206                 public struct EineStrukt {
 207
 208                         public string Foo;
 209
 210                         public EineStrukt (string foo)
 211                         {
 212                                 Foo = foo;
 213                         }
 214
 215                         public string GimmeFoo ()
 216                         {
 217                                 return Foo;
 218                         }
 219                 }
 220
 221                 [Test]
 222                 public void CallMethodOnStruct ()
 223                 {
 224                         var param = Expression.Parameter (typeof (EineStrukt), "s");
 225                         var foo = Expression.Lambda<Func<EineStrukt, string>> (
 226                                 Expression.Call (param, typeof (EineStrukt).GetMethod ("GimmeFoo")), param).Compile ();
 227
 228                         var s = new EineStrukt ("foo");
 229                         Assert.AreEqual ("foo", foo (s));
 230                 }
 231
 232                 public static int OneStaticMethod ()
 233                 {
 234                         return 42;
 235                 }
 236
 237                 [Test]
 238                 [Category ("NotDotNet")] // http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=339351
 239                 [ExpectedException (typeof (ArgumentException))]
 240                 public void CallStaticMethodOnNonSenseInstanceExpression ()
 241                 {
 242                         Expression.Call (
 243                                 Expression.Constant ("la la la"),
 244                                 this.GetType ().GetMethod ("OneStaticMethod"));
 245                 }
 246
 247                 public static int DoSomethingWith (ref int a)
 248                 {
 249                         return a + 4;
 250                 }
 251
 252                 public static string DoAnotherThing (ref int a, string s)
 253                 {
 254                         return s + a;
 255                 }
 256
 257                 [Test]
 258                 public void CallStaticMethodWithRefParameter ()
 259                 {
 260                         var p = Expression.Parameter (typeof (int), "i");
 261
 262                         var c = Expression.Lambda<Func<int, int>> (
 263                                 Expression.Call (GetType ().GetMethod ("DoSomethingWith"), p), p).Compile ();
 264
 265                         Assert.AreEqual (42, c (38));
 266                 }
 267
 268                 [Test]
 269                 public void CallStaticMethodWithRefParameterAndOtherParameter ()
 270                 {
 271                         var i = Expression.Parameter (typeof (int), "i");
 272                         var s = Expression.Parameter (typeof (string), "s");
 273
 274                         var lamda = Expression.Lambda<Func<int, string, string>> (
 275                                 Expression.Call (GetType ().GetMethod ("DoAnotherThing"), i, s), i, s).Compile ();
 276
 277                         Assert.AreEqual ("foo42", lamda (42, "foo"));
 278                 }
 279
 280                 public static int Bang (Expression i)
 281                 {
 282                         return (int) (i as ConstantExpression).Value;
 283                 }
 284
 285                 [Test]
 286                 public void CallMethodWithExpressionParameter ()
 287                 {
 288                         var call = Expression.Call (GetType ().GetMethod ("Bang"), Expression.Constant (42));
 289                         Assert.AreEqual (ExpressionType.Quote, call.Arguments [0].NodeType);
 290
 291                         var l = Expression.Lambda<Func<int>> (call).Compile ();
 292
 293                         Assert.AreEqual (42, l ());
 294                 }
 295
 296                 static bool fout_called = false;
 297
 298                 public static int FooOut (out int x)
 299                 {
 300                         fout_called = true;
 301                         return x = 0;
 302                 }
 303
 304                 [Test]
 305                 public void Connect282729 ()
 306                 {
 307                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=282729
 308
 309                         var p = Expression.Parameter (typeof (int), "p");
 310                         var lambda = Expression.Lambda<Func<int, int>> (
 311                                 Expression.Call (
 312                                         GetType ().GetMethod ("FooOut"),
 313                                         Expression.ArrayIndex(
 314                                                 Expression.NewArrayBounds (
 315                                                         typeof(int),
 316                                                         1.ToConstant ()),
 317                                                 0.ToConstant ())),
 318                                 p).Compile ();
 319
 320                         Assert.AreEqual (0, lambda (0));
 321                         Assert.IsTrue (fout_called);
 322                 }
 323
 324                 public static int FooOut2 (out int x)
 325                 {
 326                         x = 2;
 327                         return 3;
 328                 }
 329
 330                 [Test]
 331                 [Category ("NotWorking")]
 332                 public void Connect290278 ()
 333                 {
 334                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=290278
 335
 336                         var p = Expression.Parameter (typeof (int [,]), "p");
 337                         var lambda = Expression.Lambda<Func<int [,], int>> (
 338                                 Expression.Call (
 339                                         GetType ().GetMethod ("FooOut2"),
 340                                         Expression.ArrayIndex (p, 0.ToConstant (), 0.ToConstant ())),
 341                                 p).Compile ();
 342
 343                         int [,] data = { { 1 } };
 344
 345                         Assert.AreEqual (3, lambda (data));
 346                         Assert.AreEqual (2, data [0, 0]);
 347                 }
 348
 349                 public static void FooRef (ref string s)
 350                 {
 351                 }
 352
 353                 [Test]
 354                 public void Connect297597 ()
 355                 {
 356                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=297597
 357
 358                         var strings = new string [1];
 359
 360                         var lambda = Expression.Lambda<Action> (
 361                                 Expression.Call (
 362                                         GetType ().GetMethod ("FooRef"),
 363                                         Expression.ArrayIndex (
 364                                                 Expression.Constant (strings), 0.ToConstant ()))).Compile ();
 365
 366                         lambda ();
 367                 }
 368
 369                 [Test]
 370                 [Category ("NotDotNet")] // https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=319190
 371                 public void Connect319190 ()
 372                 {
 373                         var lambda = Expression.Lambda<Func<bool>> (
 374                                 Expression.TypeIs (
 375                                         Expression.New (typeof (TypedReference)),
 376                                         typeof (object))).Compile ();
 377
 378                         Assert.IsTrue (lambda ());
 379                 }
 380
 381                 public static int Truc ()
 382                 {
 383                         return 42;
 384                 }
 385
 386                 [Test]
 387                 public void Connect282702 ()
 388                 {
 389                         var lambda = Expression.Lambda<Func<Func<int>>> (
 390                                 Expression.Convert (
 391                                         Expression.Call (
 392                                                 typeof (Delegate).GetMethod ("CreateDelegate", new [] { typeof (Type), typeof (object), typeof (MethodInfo) }),
 393                                                 Expression.Constant (typeof (Func<int>), typeof (Type)),
 394                                                 Expression.Constant (null, typeof (object)),
 395                                                 Expression.Constant (GetType ().GetMethod ("Truc"))),
 396                                         typeof (Func<int>))).Compile ();
 397
 398                         Assert.AreEqual (42, lambda ().Invoke ());
 399                 }
 400
 401                 [Test]
 402                 [Category ("NotWorking")]
 403                 public void CallQueryableWhere ()
 404                 {
 405                         var queryable = new [] { 1, 2, 3 }.AsQueryable ();
 406
 407                         var parameter = Expression.Parameter (typeof (int), "i");
 408                         var lambda = Expression.Lambda<Func<int, bool>> (
 409                                 Expression.LessThan (parameter, Expression.Constant (2)),
 410                                 parameter);
 411
 412                         var selector = Expression.Quote (lambda);
 413
 414                         var call = Expression.Call (
 415                                 typeof (Queryable),
 416                                 "Where",
 417                                 new [] { typeof (int) },
 418                                 queryable.Expression,
 419                                 selector);
 420
 421                         Assert.IsNotNull (call);
 422                         Assert.IsNotNull (call.Method);
 423                 }
 424         }
 425 }