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 #if NET_4_0
  91                 [ExpectedException (typeof (ArgumentException))]
  92 #else
  93                 [ExpectedException (typeof (ArgumentNullException))]
  94 #endif
  95                 public void ArgInstanceNullForNonStaticMethod ()
  96                 {
  97                         Expression.Call (null, typeof (object).GetMethod ("ToString"));
  98                 }
  99
 100                 [Test]
 101                 [ExpectedException (typeof (ArgumentException))]
 102                 public void InstanceTypeDoesntMatchMethodDeclaringType ()
 103                 {
 104 #if MOBILE
 105                         // ensure that String.Intern won't be removed by the linker
 106                         string s = String.Intern (String.Empty);
 107 #endif
 108                         Expression.Call (Expression.Constant (1), typeof (string).GetMethod ("Intern"));
 109                 }
 110
 111                 [Test]
 112                 [ExpectedException (typeof (ArgumentException))]
 113                 public void MethodArgumentCountDoesnMatchParameterLength ()
 114                 {
 115                         Expression.Call (Expression.Constant (new object ()), typeof (object).GetMethod ("ToString"), Expression.Constant (new object ()));
 116                 }
 117
 118                 public class Foo {
 119                         public void Bar (string s)
 120                         {
 121                         }
 122                 }
 123
 124                 [Test]
 125                 [ExpectedException (typeof (ArgumentNullException))]
 126                 public void MethodHasNullArgument ()
 127                 {
 128                         Expression.Call (Expression.New (typeof (Foo)), typeof (Foo).GetMethod ("Bar"), null as Expression);
 129                 }
 130
 131                 [Test]
 132                 [ExpectedException (typeof (ArgumentException))]
 133                 public void MethodArgumentDoesntMatchParameterType ()
 134                 {
 135                         Expression.Call (Expression.New (typeof (Foo)), typeof (Foo).GetMethod ("Bar"), Expression.Constant (42));
 136                 }
 137
 138                 [Test]
 139                 public void CallToString ()
 140                 {
 141                         var call = Expression.Call (Expression.Constant (new object ()), typeof (object).GetMethod ("ToString"));
 142                         Assert.AreEqual ("value(System.Object).ToString()", call.ToString ());
 143                 }
 144
 145                 [Test]
 146                 public void CallStringIsNullOrEmpty ()
 147                 {
 148                         var call = Expression.Call (null, typeof (string).GetMethod ("IsNullOrEmpty"), Expression.Constant (""));
 149                         Assert.AreEqual ("IsNullOrEmpty(\"\")", call.ToString ());
 150                 }
 151
 152                 [Test]
 153                 [Category ("NotDotNet")] // http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=339351
 154                 [ExpectedException (typeof (ArgumentException))]
 155                 public void CallStaticMethodWithInstanceArgument ()
 156                 {
 157                         Expression.Call (
 158                                 Expression.Parameter (GetType (), "t"),
 159                                 GetType ().GetMethod ("Identity"),
 160                                 Expression.Constant (null));
 161                 }
 162
 163                 public static object Identity (object o)
 164                 {
 165                         return o;
 166                 }
 167
 168                 [Test]
 169                 public void CompileSimpleStaticCall ()
 170                 {
 171                         var p = Expression.Parameter (typeof (object), "o");
 172                         var lambda = Expression.Lambda<Func<object, object>> (Expression.Call (GetType ().GetMethod ("Identity"), p), p);
 173
 174                         var i = lambda.Compile ();
 175
 176                         Assert.AreEqual (2, i (2));
 177                         Assert.AreEqual ("Foo", i ("Foo"));
 178                 }
 179
 180                 [Test]
 181                 public void CompileSimpleInstanceCall ()
 182                 {
 183                         var p = Expression.Parameter (typeof (string), "p");
 184                         var lambda = Expression.Lambda<Func<string, string>> (
 185                                 Expression.Call (
 186                                         p, typeof (string).GetMethod ("ToString", Type.EmptyTypes)),
 187                                 p);
 188
 189                         var ts = lambda.Compile ();
 190
 191                         Assert.AreEqual ("foo", ts ("foo"));
 192                         Assert.AreEqual ("bar", ts ("bar"));
 193                 }
 194
 195                 [Test]
 196                 [ExpectedException (typeof (InvalidOperationException))]
 197                 public void CheckTypeArgsIsNotUsedForParameterLookup ()
 198                 {
 199                         Expression.Call (GetType (), "EineMethod", new [] { typeof (string), typeof (int) }, "foo".ToConstant (), 2.ToConstant ());
 200                 }
 201
 202                 public static void EineGenericMethod<X, Y> (string foo, int bar)
 203                 {
 204                 }
 205
 206                 [Test]
 207                 public void CheckTypeArgsIsUsedForGenericArguments ()
 208                 {
 209                         var m = Expression.Call (GetType (), "EineGenericMethod", new [] { typeof (string), typeof (int) }, "foo".ToConstant (), 2.ToConstant ());
 210                         Assert.IsNotNull (m.Method);
 211                         Assert.AreEqual ("Void EineGenericMethod[String,Int32](System.String, Int32)", m.Method.ToString ());
 212                 }
 213
 214                 public struct EineStrukt {
 215
 216                         public string Foo;
 217
 218                         public EineStrukt (string foo)
 219                         {
 220                                 Foo = foo;
 221                         }
 222
 223                         public string GimmeFoo ()
 224                         {
 225                                 return Foo;
 226                         }
 227                 }
 228
 229                 [Test]
 230                 [Category ("NotWorkingInterpreter")]
 231                 public void CallMethodOnStruct ()
 232                 {
 233                         var param = Expression.Parameter (typeof (EineStrukt), "s");
 234                         var foo = Expression.Lambda<Func<EineStrukt, string>> (
 235                                 Expression.Call (param, typeof (EineStrukt).GetMethod ("GimmeFoo")), param).Compile ();
 236
 237                         var s = new EineStrukt ("foo");
 238                         Assert.AreEqual ("foo", foo (s));
 239                 }
 240
 241                 public static int OneStaticMethod ()
 242                 {
 243                         return 42;
 244                 }
 245
 246                 [Test]
 247                 [Category ("NotDotNet")] // http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=339351
 248                 [ExpectedException (typeof (ArgumentException))]
 249                 public void CallStaticMethodOnNonSenseInstanceExpression ()
 250                 {
 251                         Expression.Call (
 252                                 Expression.Constant ("la la la"),
 253                                 this.GetType ().GetMethod ("OneStaticMethod"));
 254                 }
 255
 256                 public static int DoSomethingWith (ref int a)
 257                 {
 258                         return a + 4;
 259                 }
 260
 261                 public static string DoAnotherThing (ref int a, string s)
 262                 {
 263                         return s + a;
 264                 }
 265
 266                 [Test]
 267                 [Category ("NotWorkingInterpreter")]
 268                 public void CallStaticMethodWithRefParameter ()
 269                 {
 270                         var p = Expression.Parameter (typeof (int), "i");
 271
 272                         var c = Expression.Lambda<Func<int, int>> (
 273                                 Expression.Call (GetType ().GetMethod ("DoSomethingWith"), p), p).Compile ();
 274
 275                         Assert.AreEqual (42, c (38));
 276                 }
 277
 278                 [Test]
 279                 [Category ("NotWorkingInterpreter")]
 280                 public void CallStaticMethodWithRefParameterAndOtherParameter ()
 281                 {
 282                         var i = Expression.Parameter (typeof (int), "i");
 283                         var s = Expression.Parameter (typeof (string), "s");
 284
 285                         var lamda = Expression.Lambda<Func<int, string, string>> (
 286                                 Expression.Call (GetType ().GetMethod ("DoAnotherThing"), i, s), i, s).Compile ();
 287
 288                         Assert.AreEqual ("foo42", lamda (42, "foo"));
 289                 }
 290
 291                 public static int Bang (Expression i)
 292                 {
 293                         return (int) (i as ConstantExpression).Value;
 294                 }
 295 #if !NET_4_0 // dlr bug 5875
 296                 [Test]
 297                 public void CallMethodWithExpressionParameter ()
 298                 {
 299                         var call = Expression.Call (GetType ().GetMethod ("Bang"), Expression.Constant (42));
 300                         Assert.AreEqual (ExpressionType.Quote, call.Arguments [0].NodeType);
 301
 302                         var l = Expression.Lambda<Func<int>> (call).Compile ();
 303
 304                         Assert.AreEqual (42, l ());
 305                 }
 306 #endif
 307                 static bool fout_called = false;
 308
 309                 public static int FooOut (out int x)
 310                 {
 311                         fout_called = true;
 312                         return x = 0;
 313                 }
 314
 315                 [Test]
 316                 [Category ("NotWorkingInterpreter")]
 317                 public void Connect282729 ()
 318                 {
 319                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=282729
 320
 321                         var p = Expression.Parameter (typeof (int), "p");
 322                         var lambda = Expression.Lambda<Func<int, int>> (
 323                                 Expression.Call (
 324                                         GetType ().GetMethod ("FooOut"),
 325                                         Expression.ArrayIndex(
 326                                                 Expression.NewArrayBounds (
 327                                                         typeof(int),
 328                                                         1.ToConstant ()),
 329                                                 0.ToConstant ())),
 330                                 p).Compile ();
 331
 332                         Assert.AreEqual (0, lambda (0));
 333                         Assert.IsTrue (fout_called);
 334                 }
 335
 336                 public static int FooOut2 (out int x)
 337                 {
 338                         x = 2;
 339                         return 3;
 340                 }
 341
 342                 [Test]
 343                 [Category ("NotWorking")]
 344                 [Category ("NotWorkingInterpreter")]
 345                 public void Connect290278 ()
 346                 {
 347                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=290278
 348
 349                         var p = Expression.Parameter (typeof (int [,]), "p");
 350                         var lambda = Expression.Lambda<Func<int [,], int>> (
 351                                 Expression.Call (
 352                                         GetType ().GetMethod ("FooOut2"),
 353                                         Expression.ArrayIndex (p, 0.ToConstant (), 0.ToConstant ())),
 354                                 p).Compile ();
 355
 356                         int [,] data = { { 1 } };
 357
 358                         Assert.AreEqual (3, lambda (data));
 359                         Assert.AreEqual (2, data [0, 0]);
 360                 }
 361
 362                 public static void FooRef (ref string s)
 363                 {
 364                 }
 365
 366                 [Test]
 367                 [Category ("NotWorkingInterpreter")]
 368                 public void Connect297597 ()
 369                 {
 370                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=297597
 371
 372                         var strings = new string [1];
 373
 374                         var lambda = Expression.Lambda<Action> (
 375                                 Expression.Call (
 376                                         GetType ().GetMethod ("FooRef"),
 377                                         Expression.ArrayIndex (
 378                                                 Expression.Constant (strings), 0.ToConstant ()))).Compile ();
 379
 380                         lambda ();
 381                 }
 382
 383                 [Test]
 384                 [Category ("NotDotNet")] // https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=319190
 385                 public void Connect319190 ()
 386                 {
 387                         var lambda = Expression.Lambda<Func<bool>> (
 388                                 Expression.TypeIs (
 389                                         Expression.New (typeof (TypedReference)),
 390                                         typeof (object))).Compile ();
 391
 392                         Assert.IsTrue (lambda ());
 393                 }
 394
 395                 public static int Truc ()
 396                 {
 397                         return 42;
 398                 }
 399
 400                 [Test]
 401                 [Category ("NotWorkingInterpreter")]
 402                 public void Connect282702 ()
 403                 {
 404                         var lambda = Expression.Lambda<Func<Func<int>>> (
 405                                 Expression.Convert (
 406                                         Expression.Call (
 407                                                 typeof (Delegate).GetMethod ("CreateDelegate", new [] { typeof (Type), typeof (object), typeof (MethodInfo) }),
 408                                                 Expression.Constant (typeof (Func<int>), typeof (Type)),
 409                                                 Expression.Constant (null, typeof (object)),
 410                                                 Expression.Constant (GetType ().GetMethod ("Truc"))),
 411                                         typeof (Func<int>))).Compile ();
 412
 413                         Assert.AreEqual (42, lambda ().Invoke ());
 414                 }
 415
 416                 [Test]
 417                 public void CallQueryableWhere ()
 418                 {
 419                         var queryable = new [] { 1, 2, 3 }.AsQueryable ();
 420
 421                         var parameter = Expression.Parameter (typeof (int), "i");
 422                         var lambda = Expression.Lambda<Func<int, bool>> (
 423                                 Expression.LessThan (parameter, Expression.Constant (2)),
 424                                 parameter);
 425
 426                         var selector = Expression.Quote (lambda);
 427
 428                         var call = Expression.Call (
 429                                 typeof (Queryable),
 430                                 "Where",
 431                                 new [] { typeof (int) },
 432                                 queryable.Expression,
 433                                 selector);
 434
 435                         Assert.IsNotNull (call);
 436                         Assert.IsNotNull (call.Method);
 437                 }
 438
 439                 [Test]
 440                 public void CallAsQueryable () // #537768
 441                 {
 442                         var constant = Expression.Constant (
 443                                 new List<string> (),
 444                                 typeof (IEnumerable<string>));
 445
 446                         var call = Expression.Call (
 447                                 typeof (Queryable),
 448                                 "AsQueryable",
 449                                 new [] { typeof (string) },
 450                                 constant);
 451
 452                         Assert.IsNotNull (call);
 453                         Assert.AreEqual (1, call.Arguments.Count);
 454                         Assert.AreEqual (constant, call.Arguments [0]);
 455
 456                         var method = call.Method;
 457
 458                         Assert.AreEqual ("AsQueryable", method.Name);
 459                         Assert.IsTrue (method.IsGenericMethod);
 460                         Assert.AreEqual (typeof (string), method.GetGenericArguments () [0]);
 461                 }
 462
 463
 464                 [Test]
 465                 public void CallQueryableSelect () // #536637
 466                 {
 467                         var parameter = Expression.Parameter (typeof (string), "s");
 468                         var string_length = Expression.Property (parameter, typeof (string).GetProperty ("Length"));
 469                         var lambda = Expression.Lambda (string_length, parameter);
 470
 471                         var strings = new [] { "1", "22", "333" };
 472
 473                         var call = Expression.Call (
 474                                 typeof (Queryable),
 475                                 "Select",
 476                                 new [] { typeof (string), typeof (int) },
 477                                 Expression.Constant (strings.AsQueryable ()),
 478                                 lambda);
 479
 480                         Assert.IsNotNull (call);
 481
 482                         var method = call.Method;
 483
 484                         Assert.AreEqual ("Select", method.Name);
 485                         Assert.IsTrue (method.IsGenericMethod);
 486                         Assert.AreEqual (typeof (string), method.GetGenericArguments () [0]);
 487                         Assert.AreEqual (typeof (int), method.GetGenericArguments () [1]);
 488                 }
 489
 490                 [Test]
 491                 [Category ("NotWorkingInterpreter")]
 492                 public void CallNullableGetValueOrDefault () // #568989
 493                 {
 494                         var value = Expression.Parameter (typeof (int?), "value");
 495                         var default_parameter = Expression.Parameter (typeof (int), "default");
 496
 497                         var getter = Expression.Lambda<Func<int?, int, int>> (
 498                                 Expression.Call (
 499                                         value,
 500                                         "GetValueOrDefault",
 501                                         Type.EmptyTypes,
 502                                         default_parameter),
 503                                 value,
 504                                 default_parameter).Compile ();
 505
 506                         Assert.AreEqual (2, getter (null, 2));
 507                         Assert.AreEqual (4, getter (4, 2));
 508                 }
 509
 510                 [Test]
 511                 public void CallToStringOnEnum () // #625367
 512                 {
 513                         var lambda = Expression.Lambda<Func<string>> (
 514                                 Expression.Call (
 515                                         Expression.Constant (TypeCode.Boolean, typeof (TypeCode)),
 516                                         typeof (object).GetMethod ("ToString"))).Compile ();
 517
 518                         Assert.AreEqual ("Boolean", lambda ());
 519                 }
 520
 521                 public static void AcceptsIEnumerable(IEnumerable<object> o)
 522                 {
 523                 }
 524
 525                 [Test]
 526                 public void CallIQueryableMethodWithNewArrayBoundExpression () // #2304
 527                 {
 528                         Expression.Call (
 529                                 GetType ().GetMethod ("AcceptsIEnumerable", BindingFlags.Public | BindingFlags.Static),
 530                                 Expression.NewArrayBounds (typeof (object), Expression.Constant (0)));
 531                 }
 532         }
 533 }