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