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

   1 //
   2 // ExpressionTest_Convert.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.Reflection;
  31 using System.Linq;
  32 using System.Linq.Expressions;
  33 using NUnit.Framework;
  34
  35 namespace MonoTests.System.Linq.Expressions {
  36
  37         [TestFixture]
  38         public class ExpressionTest_Convert {
  39
  40                 [Test]
  41                 [ExpectedException (typeof (ArgumentNullException))]
  42                 public void NullExpression ()
  43                 {
  44                         Expression.Convert (null, typeof (int));
  45                 }
  46
  47                 [Test]
  48                 [ExpectedException (typeof (ArgumentNullException))]
  49                 public void NullType ()
  50                 {
  51                         Expression.Convert (1.ToConstant (), null);
  52                 }
  53
  54                 [Test]
  55                 [ExpectedException (typeof (InvalidOperationException))]
  56                 public void ConvertIntToString ()
  57                 {
  58                         Expression.Convert (1.ToConstant (), typeof (string));
  59                 }
  60
  61                 interface IFoo { }
  62                 class Foo : IFoo { }
  63                 class Bar : Foo { }
  64                 class Baz { }
  65
  66                 interface ITzap { }
  67
  68                 [Test]
  69                 public void ConvertBackwardAssignability ()
  70                 {
  71                         var c = Expression.Convert (
  72                                 Expression.Constant (null, typeof (Bar)), typeof (Foo));
  73
  74                         Assert.AreEqual ("Convert(null)", c.ToString ());
  75                 }
  76
  77                 [Test]
  78                 public void ConvertInterfaces ()
  79                 {
  80                         var p = Expression.Parameter (typeof (IFoo), null);
  81
  82                         var conv = Expression.Convert (p, typeof (ITzap));
  83                         Assert.AreEqual (typeof (ITzap), conv.Type);
  84 #if !NET_4_0
  85                         Assert.AreEqual ("Convert(<param>)", conv.ToString ());
  86 #endif
  87                         p = Expression.Parameter (typeof (ITzap), null);
  88                         conv = Expression.Convert (p, typeof (IFoo));
  89
  90                         Assert.AreEqual (typeof (IFoo), conv.Type);
  91 #if !NET_4_0
  92                         Assert.AreEqual ("Convert(<param>)", conv.ToString ());
  93 #endif
  94                 }
  95
  96                 [Test]
  97                 public void ConvertCheckedInt32ToInt64 ()
  98                 {
  99                         var c = Expression.ConvertChecked (
 100                                 Expression.Constant (2, typeof (int)), typeof (long));
 101
 102                         Assert.AreEqual (ExpressionType.ConvertChecked, c.NodeType);
 103                         Assert.AreEqual ("ConvertChecked(2)", c.ToString ());
 104                 }
 105
 106                 [Test]
 107                 public void ConvertCheckedFallbackToConvertForNonPrimitives ()
 108                 {
 109                         var p = Expression.ConvertChecked (
 110                                 Expression.Constant (null, typeof (object)), typeof (IFoo));
 111
 112                         Assert.AreEqual (ExpressionType.Convert, p.NodeType);
 113                 }
 114
 115                 [Test]
 116                 [ExpectedException (typeof (InvalidOperationException))]
 117                 public void ConvertBazToFoo ()
 118                 {
 119                         Expression.Convert (Expression.Parameter (typeof (Baz), ""), typeof (Foo));
 120                 }
 121
 122                 struct EineStrukt { }
 123
 124                 [Test]
 125                 [ExpectedException (typeof (InvalidOperationException))]
 126                 public void ConvertStructToFoo ()
 127                 {
 128                         Expression.Convert (Expression.Parameter (typeof (EineStrukt), ""), typeof (Foo));
 129                 }
 130
 131                 [Test]
 132                 [ExpectedException (typeof (InvalidOperationException))]
 133                 public void ConvertInt32ToBool ()
 134                 {
 135                         Expression.Convert (Expression.Parameter (typeof (int), ""), typeof (bool));
 136                 }
 137
 138                 [Test]
 139                 public void ConvertIFooToFoo ()
 140                 {
 141                         var c = Expression.Convert (Expression.Parameter (typeof (IFoo), ""), typeof (Foo));
 142                         Assert.AreEqual (typeof (Foo), c.Type);
 143                         Assert.IsFalse (c.IsLifted);
 144                         Assert.IsFalse (c.IsLiftedToNull);
 145                         Assert.IsNull (c.Method);
 146                 }
 147
 148                 [Test]
 149                 public void BoxInt32 ()
 150                 {
 151                         var c = Expression.Convert (Expression.Parameter (typeof (int), ""), typeof (object));
 152                         Assert.AreEqual (typeof (object), c.Type);
 153                         Assert.IsFalse (c.IsLifted);
 154                         Assert.IsFalse (c.IsLiftedToNull);
 155                         Assert.IsNull (c.Method);
 156                 }
 157
 158                 [Test]
 159                 public void UnBoxInt32 ()
 160                 {
 161                         var c = Expression.Convert (Expression.Parameter (typeof (object), ""), typeof (int));
 162                         Assert.AreEqual (typeof (int), c.Type);
 163                         Assert.IsFalse (c.IsLifted);
 164                         Assert.IsFalse (c.IsLiftedToNull);
 165                         Assert.IsNull (c.Method);
 166                 }
 167
 168                 [Test]
 169                 public void ConvertInt32ToInt64 ()
 170                 {
 171                         var c = Expression.Convert (Expression.Parameter (typeof (int), ""), typeof (long));
 172                         Assert.AreEqual (typeof (long), c.Type);
 173                         Assert.IsFalse (c.IsLifted);
 174                         Assert.IsFalse (c.IsLiftedToNull);
 175                         Assert.IsNull (c.Method);
 176                 }
 177
 178                 [Test]
 179                 public void ConvertInt64ToInt32 ()
 180                 {
 181                         var c = Expression.Convert (Expression.Parameter (typeof (long), ""), typeof (int));
 182                         Assert.AreEqual (typeof (int), c.Type);
 183                         Assert.IsFalse (c.IsLifted);
 184                         Assert.IsFalse (c.IsLiftedToNull);
 185                         Assert.IsNull (c.Method);
 186                 }
 187
 188                 enum EineEnum {
 189                         EineValue,
 190                 }
 191
 192                 [Test]
 193                 public void ConvertEnumToInt32 ()
 194                 {
 195                         var c = Expression.Convert (Expression.Parameter (typeof (EineEnum), ""), typeof (int));
 196                         Assert.AreEqual (typeof (int), c.Type);
 197                         Assert.IsFalse (c.IsLifted);
 198                         Assert.IsFalse (c.IsLiftedToNull);
 199                         Assert.IsNull (c.Method);
 200                 }
 201
 202                 [Test]
 203                 public void ConvertNullableInt32ToInt32 ()
 204                 {
 205                         var c = Expression.Convert (Expression.Parameter (typeof (int?), ""), typeof (int));
 206                         Assert.AreEqual (typeof (int), c.Type);
 207                         Assert.IsTrue (c.IsLifted);
 208                         Assert.IsFalse (c.IsLiftedToNull);
 209                         Assert.IsNull (c.Method);
 210                 }
 211
 212                 [Test]
 213                 public void ConvertInt32ToNullableInt32 ()
 214                 {
 215                         var c = Expression.Convert (Expression.Parameter (typeof (int), ""), typeof (int?));
 216                         Assert.AreEqual (typeof (int?), c.Type);
 217                         Assert.IsTrue (c.IsLifted);
 218                         Assert.IsTrue (c.IsLiftedToNull);
 219                         Assert.IsNull (c.Method);
 220                 }
 221
 222
 223                 class Klang {
 224                         int i;
 225
 226                         public Klang (int i)
 227                         {
 228                                 this.i = i;
 229                         }
 230
 231                         public static explicit operator int (Klang k)
 232                         {
 233                                 return k.i;
 234                         }
 235                 }
 236
 237                 [Test]
 238                 public void ConvertClassWithExplicitOp ()
 239                 {
 240                         var c = Expression.Convert (Expression.Parameter (typeof (Klang), ""), typeof (int));
 241                         Assert.AreEqual (typeof (int), c.Type);
 242                         Assert.IsFalse (c.IsLifted);
 243                         Assert.IsFalse (c.IsLiftedToNull);
 244                         Assert.IsNotNull (c.Method);
 245                 }
 246
 247                 [Test]
 248                 public void CompileConvertClassWithExplicitOp ()
 249                 {
 250                         var p = Expression.Parameter (typeof (Klang), "klang");
 251                         var c = Expression.Lambda<Func<Klang, int>> (
 252                                 Expression.Convert (p, typeof (int)), p).Compile ();
 253
 254                         Assert.AreEqual (42, c (new Klang (42)));
 255                 }
 256
 257                 [Test]
 258                 public void ConvertClassWithExplicitOpToNullableInt ()
 259                 {
 260                         var c = Expression.Convert (Expression.Parameter (typeof (Klang), ""), typeof (int?));
 261                         Assert.AreEqual (typeof (int?), c.Type);
 262                         Assert.IsTrue (c.IsLifted);
 263                         Assert.IsTrue (c.IsLiftedToNull);
 264                         Assert.IsNotNull (c.Method);
 265                 }
 266
 267                 struct Kling {
 268                         int i;
 269
 270                         public Kling (int i)
 271                         {
 272                                 this.i = i;
 273                         }
 274
 275                         public static implicit operator int (Kling k)
 276                         {
 277                                 return k.i;
 278                         }
 279                 }
 280
 281                 [Test]
 282                 public void ConvertStructWithImplicitOp ()
 283                 {
 284                         var c = Expression.Convert (Expression.Parameter (typeof (Kling), ""), typeof (int));
 285                         Assert.AreEqual (typeof (int), c.Type);
 286                         Assert.IsFalse (c.IsLifted);
 287                         Assert.IsFalse (c.IsLiftedToNull);
 288                         Assert.IsNotNull (c.Method);
 289                 }
 290
 291                 [Test]
 292                 public void CompileConvertStructWithImplicitOp ()
 293                 {
 294                         var p = Expression.Parameter (typeof (Kling), "kling");
 295                         var c = Expression.Lambda<Func<Kling, int>> (
 296                                 Expression.Convert (p, typeof (int)), p).Compile ();
 297
 298                         Assert.AreEqual (42, c (new Kling (42)));
 299                 }
 300
 301                 [Test]
 302                 public void ConvertStructWithImplicitOpToNullableInt ()
 303                 {
 304                         var c = Expression.Convert (Expression.Parameter (typeof (Kling), ""), typeof (int?));
 305                         Assert.AreEqual (typeof (int?), c.Type);
 306                         Assert.IsTrue (c.IsLifted);
 307                         Assert.IsTrue (c.IsLiftedToNull);
 308                         Assert.IsNotNull (c.Method);
 309                 }
 310
 311                 [Test]
 312                 public void ConvertNullableStructWithImplicitOpToNullableInt ()
 313                 {
 314                         var c = Expression.Convert (Expression.Parameter (typeof (Kling?), ""), typeof (int?));
 315                         Assert.AreEqual (typeof (int?), c.Type);
 316                         Assert.IsTrue (c.IsLifted);
 317                         Assert.IsTrue (c.IsLiftedToNull);
 318                         Assert.IsNotNull (c.Method);
 319                 }
 320
 321                 [Test]
 322                 public void CompiledBoxing ()
 323                 {
 324                         var b = Expression.Lambda<Func<object>> (
 325                                 Expression.Convert (42.ToConstant (), typeof (object))).Compile ();
 326
 327                         Assert.AreEqual ((object) 42, b ());
 328                 }
 329
 330                 [Test]
 331                 public void CompiledUnBoxing ()
 332                 {
 333                         var p = Expression.Parameter (typeof (object), "o");
 334
 335                         var u = Expression.Lambda<Func<object, int>> (
 336                                 Expression.Convert (p, typeof (int)), p).Compile ();
 337
 338                         Assert.AreEqual (42, u ((object) 42));
 339                 }
 340
 341                 [Test]
 342                 public void CompiledCast ()
 343                 {
 344                         var p = Expression.Parameter (typeof (IFoo), "foo");
 345
 346                         var c = Expression.Lambda<Func<IFoo, Bar>> (
 347                                 Expression.Convert (p, typeof (Bar)), p).Compile ();
 348
 349                         IFoo foo = new Bar ();
 350
 351                         Bar b = c (foo);
 352
 353                         Assert.AreEqual (b, foo);
 354                 }
 355
 356                 [Test]
 357                 public void CompileNotNullableToNullable ()
 358                 {
 359                         var p = Expression.Parameter (typeof (int), "i");
 360                         var c = Expression.Lambda<Func<int, int?>> (
 361                                 Expression.Convert (p, typeof (int?)), p).Compile ();
 362
 363                         Assert.AreEqual ((int?) 0, c (0));
 364                         Assert.AreEqual ((int?) 42, c (42));
 365                 }
 366
 367                 [Test]
 368                 public void CompileNullableToNotNullable ()
 369                 {
 370                         var p = Expression.Parameter (typeof (int?), "i");
 371                         var c = Expression.Lambda<Func<int?, int>> (
 372                                 Expression.Convert (p, typeof (int)), p).Compile ();
 373
 374                         Assert.AreEqual (0, c ((int?) 0));
 375                         Assert.AreEqual (42, c ((int?) 42));
 376
 377                         Action a = () => c (null);
 378
 379                         a.AssertThrows (typeof (InvalidOperationException));
 380                 }
 381
 382                 [Test]
 383                 public void CompiledConvertToSameType ()
 384                 {
 385                         var k = new Klang (42);
 386
 387                         var p = Expression.Parameter (typeof (Klang), "klang");
 388                         var c = Expression.Lambda<Func<Klang, Klang>> (
 389                                 Expression.Convert (
 390                                         p, typeof (Klang)),
 391                                 p).Compile ();
 392
 393                         Assert.AreEqual (k, c (k));
 394                 }
 395
 396                 [Test]
 397                 public void CompiledConvertNullableToNullable ()
 398                 {
 399                         var p = Expression.Parameter (typeof (int?), "i");
 400                         var c = Expression.Lambda<Func<int?, short?>> (
 401                                 Expression.Convert (p, typeof (short?)), p).Compile ();
 402
 403                         Assert.AreEqual ((short?) null, c (null));
 404                         Assert.AreEqual ((short?) 12, c (12));
 405                 }
 406
 407                 [Test]
 408                 public void CompiledNullableBoxing ()
 409                 {
 410                         var p = Expression.Parameter (typeof (int?), "i");
 411                         var c = Expression.Lambda<Func<int?, object>> (
 412                                 Expression.Convert (p, typeof (object)), p).Compile ();
 413
 414                         Assert.AreEqual (null, c (null));
 415                         Assert.AreEqual ((object) (int?) 42, c (42));
 416                 }
 417
 418                 [Test]
 419                 public void CompiledNullableUnboxing ()
 420                 {
 421                         var p = Expression.Parameter (typeof (object), "o");
 422                         var c = Expression.Lambda<Func<object, int?>> (
 423                                 Expression.Convert (p, typeof (int?)), p).Compile ();
 424
 425                         Assert.AreEqual ((int?) null, c (null));
 426                         Assert.AreEqual ((int?) 42, c ((int?) 42));
 427                 }
 428
 429                 [Test]
 430                 public void ChainedNullableConvert ()
 431                 {
 432                         var p = Expression.Parameter (typeof (sbyte?), "a");
 433
 434                         var test = Expression.Lambda<Func<sbyte?, long?>> (
 435                                 Expression.Convert (
 436                                         Expression.Convert (
 437                                                 p,
 438                                                 typeof (int?)),
 439                                         typeof (long?)), p).Compile ();
 440
 441                         Assert.AreEqual ((long?) 3, test ((sbyte?) 3));
 442                         Assert.AreEqual (null, test (null));
 443                 }
 444
 445                 struct ImplicitToShort {
 446                         short value;
 447
 448                         public ImplicitToShort (short v)
 449                         {
 450                                 value = v;
 451                         }
 452
 453                         public static implicit operator short (ImplicitToShort i)
 454                         {
 455                                 return i.value;
 456                         }
 457                 }
 458
 459                 [Test]
 460                 public void ConvertImplicitToShortToNullableInt ()
 461                 {
 462                         var a = Expression.Parameter (typeof (ImplicitToShort?), "a");
 463
 464                         var method = typeof (ImplicitToShort).GetMethod ("op_Implicit");
 465
 466                         var node = Expression.Convert (a, typeof (short), method);
 467                         Assert.IsTrue (node.IsLifted);
 468                         Assert.IsFalse (node.IsLiftedToNull);
 469                         Assert.AreEqual (typeof (short), node.Type);
 470                         Assert.AreEqual (method, node.Method);
 471
 472                         var conv = Expression.Lambda<Func<ImplicitToShort?, int?>> (
 473                                 Expression.Convert (
 474                                         node,
 475                                         typeof (int?)), a).Compile ();
 476
 477                         Assert.AreEqual ((int?) 42, conv (new ImplicitToShort (42)));
 478
 479                         Action convnull = () => Assert.AreEqual (null, conv (null));
 480
 481                         convnull.AssertThrows (typeof (InvalidOperationException));
 482                 }
 483
 484                 [Test]
 485                 public void NullableImplicitToShort ()
 486                 {
 487                         var i = Expression.Parameter (typeof (ImplicitToShort?), "i");
 488
 489                         var method = typeof (ImplicitToShort).GetMethod ("op_Implicit");
 490
 491                         var node = Expression.Convert (i, typeof (short?), method);
 492
 493                         Assert.IsTrue (node.IsLifted);
 494                         Assert.IsTrue (node.IsLiftedToNull);
 495                         Assert.AreEqual (typeof (short?), node.Type);
 496                         Assert.AreEqual (method, node.Method);
 497
 498                         var convert = Expression.Lambda<Func<ImplicitToShort?, short?>> (node, i).Compile ();
 499
 500                         Assert.AreEqual ((short?) 42, convert (new ImplicitToShort (42)));
 501                 }
 502
 503                 [Test]
 504                 public void ConvertLongToDecimal ()
 505                 {
 506                         var p = Expression.Parameter (typeof (long), "l");
 507
 508                         var node = Expression.Convert (p, typeof (decimal));
 509                         Assert.IsFalse (node.IsLifted);
 510                         Assert.IsFalse (node.IsLiftedToNull);
 511                         Assert.AreEqual (typeof (decimal), node.Type);
 512                         Assert.IsNotNull (node.Method);
 513
 514                         var convert = Expression.Lambda<Func<long, decimal>> (node, p).Compile ();
 515
 516                         Assert.AreEqual (42, convert (42));
 517                 }
 518
 519                 [Test]
 520                 public void ConvertNullableULongToNullableDecimal ()
 521                 {
 522                         var p = Expression.Parameter (typeof (ulong?), "l");
 523
 524                         var node = Expression.Convert (p, typeof (decimal?));
 525                         Assert.IsTrue (node.IsLifted);
 526                         Assert.IsTrue (node.IsLiftedToNull);
 527                         Assert.AreEqual (typeof (decimal?), node.Type);
 528                         Assert.IsNotNull (node.Method);
 529
 530                         var convert = Expression.Lambda<Func<ulong?, decimal?>> (node, p).Compile ();
 531
 532                         Assert.AreEqual (42, convert (42));
 533                         Assert.AreEqual (null, convert (null));
 534                 }
 535
 536                 [Test]
 537                 public void ConvertCheckedNullableIntToInt ()
 538                 {
 539                         var p = Expression.Parameter (typeof (int?), "i");
 540
 541                         var node = Expression.ConvertChecked (p, typeof (int));
 542                         Assert.AreEqual (ExpressionType.ConvertChecked, node.NodeType);
 543                         Assert.IsTrue (node.IsLifted);
 544                         Assert.IsFalse (node.IsLiftedToNull);
 545                         Assert.AreEqual (typeof (int), node.Type);
 546                         Assert.IsNull (node.Method);
 547                 }
 548
 549                 struct ImplicitToInt {
 550                         int Value;
 551
 552                         public ImplicitToInt (int v)
 553                         {
 554                                 Value = v;
 555                         }
 556
 557                         public static implicit operator int (ImplicitToInt i)
 558                         {
 559                                 return i.Value;
 560                         }
 561                 }
 562
 563                 [Test]
 564                 public void ConvertNullableImplictToIntToNullableLong ()
 565                 {
 566                         var i = Expression.Parameter (typeof (ImplicitToInt?), "i");
 567
 568                         var method = typeof (ImplicitToInt).GetMethod ("op_Implicit");
 569
 570                         var node = Expression.Convert (i, typeof (int), method);
 571                         node = Expression.Convert (node, typeof (long?));
 572                         var conv = Expression.Lambda<Func<ImplicitToInt?, long?>> (node, i).Compile ();
 573
 574                         Assert.AreEqual ((long?) 42, conv (new ImplicitToInt (42)));
 575                         Action convnull = () => Assert.AreEqual (null, conv (null));
 576                         convnull.AssertThrows (typeof (InvalidOperationException));
 577                 }
 578
 579                 [Test]
 580                 [ExpectedException (typeof (InvalidOperationException))]
 581                 [Category ("NotWorking")]
 582                 public void ConvertNullableIntToStringWithConvertMethod ()
 583                 {
 584                         Expression.Convert (
 585                                 Expression.Constant ((int?) 0),
 586                                 typeof (string),
 587                                 typeof (Convert).GetMethod ("ToString", new [] { typeof (object) }));
 588                 }
 589
 590                 [Test] // #678897
 591                 public void ConvertEnumValueToEnum ()
 592                 {
 593                         var node = Expression.Convert (
 594                                 Expression.Constant (EineEnum.EineValue, typeof (EineEnum)),
 595                                 typeof (Enum));
 596
 597                         Assert.IsNotNull (node);
 598                         Assert.AreEqual (typeof (Enum), node.Type);
 599                 }
 600         }
 601 }