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
 190                 [Test]
 191                 public void ConvertEnumToInt32 ()
 192                 {
 193                         var c = Expression.Convert (Expression.Parameter (typeof (EineEnum), ""), typeof (int));
 194                         Assert.AreEqual (typeof (int), c.Type);
 195                         Assert.IsFalse (c.IsLifted);
 196                         Assert.IsFalse (c.IsLiftedToNull);
 197                         Assert.IsNull (c.Method);
 198                 }
 199
 200                 [Test]
 201                 public void ConvertNullableInt32ToInt32 ()
 202                 {
 203                         var c = Expression.Convert (Expression.Parameter (typeof (int?), ""), typeof (int));
 204                         Assert.AreEqual (typeof (int), c.Type);
 205                         Assert.IsTrue (c.IsLifted);
 206                         Assert.IsFalse (c.IsLiftedToNull);
 207                         Assert.IsNull (c.Method);
 208                 }
 209
 210                 [Test]
 211                 public void ConvertInt32ToNullableInt32 ()
 212                 {
 213                         var c = Expression.Convert (Expression.Parameter (typeof (int), ""), typeof (int?));
 214                         Assert.AreEqual (typeof (int?), c.Type);
 215                         Assert.IsTrue (c.IsLifted);
 216                         Assert.IsTrue (c.IsLiftedToNull);
 217                         Assert.IsNull (c.Method);
 218                 }
 219
 220
 221                 class Klang {
 222                         int i;
 223
 224                         public Klang (int i)
 225                         {
 226                                 this.i = i;
 227                         }
 228
 229                         public static explicit operator int (Klang k)
 230                         {
 231                                 return k.i;
 232                         }
 233                 }
 234
 235                 [Test]
 236                 public void ConvertClassWithExplicitOp ()
 237                 {
 238                         var c = Expression.Convert (Expression.Parameter (typeof (Klang), ""), typeof (int));
 239                         Assert.AreEqual (typeof (int), c.Type);
 240                         Assert.IsFalse (c.IsLifted);
 241                         Assert.IsFalse (c.IsLiftedToNull);
 242                         Assert.IsNotNull (c.Method);
 243                 }
 244
 245                 [Test]
 246                 public void CompileConvertClassWithExplicitOp ()
 247                 {
 248                         var p = Expression.Parameter (typeof (Klang), "klang");
 249                         var c = Expression.Lambda<Func<Klang, int>> (
 250                                 Expression.Convert (p, typeof (int)), p).Compile ();
 251
 252                         Assert.AreEqual (42, c (new Klang (42)));
 253                 }
 254
 255                 [Test]
 256                 public void ConvertClassWithExplicitOpToNullableInt ()
 257                 {
 258                         var c = Expression.Convert (Expression.Parameter (typeof (Klang), ""), typeof (int?));
 259                         Assert.AreEqual (typeof (int?), c.Type);
 260                         Assert.IsTrue (c.IsLifted);
 261                         Assert.IsTrue (c.IsLiftedToNull);
 262                         Assert.IsNotNull (c.Method);
 263                 }
 264
 265                 struct Kling {
 266                         int i;
 267
 268                         public Kling (int i)
 269                         {
 270                                 this.i = i;
 271                         }
 272
 273                         public static implicit operator int (Kling k)
 274                         {
 275                                 return k.i;
 276                         }
 277                 }
 278
 279                 [Test]
 280                 public void ConvertStructWithImplicitOp ()
 281                 {
 282                         var c = Expression.Convert (Expression.Parameter (typeof (Kling), ""), typeof (int));
 283                         Assert.AreEqual (typeof (int), c.Type);
 284                         Assert.IsFalse (c.IsLifted);
 285                         Assert.IsFalse (c.IsLiftedToNull);
 286                         Assert.IsNotNull (c.Method);
 287                 }
 288
 289                 [Test]
 290                 public void CompileConvertStructWithImplicitOp ()
 291                 {
 292                         var p = Expression.Parameter (typeof (Kling), "kling");
 293                         var c = Expression.Lambda<Func<Kling, int>> (
 294                                 Expression.Convert (p, typeof (int)), p).Compile ();
 295
 296                         Assert.AreEqual (42, c (new Kling (42)));
 297                 }
 298
 299                 [Test]
 300                 public void ConvertStructWithImplicitOpToNullableInt ()
 301                 {
 302                         var c = Expression.Convert (Expression.Parameter (typeof (Kling), ""), typeof (int?));
 303                         Assert.AreEqual (typeof (int?), c.Type);
 304                         Assert.IsTrue (c.IsLifted);
 305                         Assert.IsTrue (c.IsLiftedToNull);
 306                         Assert.IsNotNull (c.Method);
 307                 }
 308
 309                 [Test]
 310                 public void ConvertNullableStructWithImplicitOpToNullableInt ()
 311                 {
 312                         var c = Expression.Convert (Expression.Parameter (typeof (Kling?), ""), typeof (int?));
 313                         Assert.AreEqual (typeof (int?), c.Type);
 314                         Assert.IsTrue (c.IsLifted);
 315                         Assert.IsTrue (c.IsLiftedToNull);
 316                         Assert.IsNotNull (c.Method);
 317                 }
 318
 319                 [Test]
 320                 public void CompiledBoxing ()
 321                 {
 322                         var b = Expression.Lambda<Func<object>> (
 323                                 Expression.Convert (42.ToConstant (), typeof (object))).Compile ();
 324
 325                         Assert.AreEqual ((object) 42, b ());
 326                 }
 327
 328                 [Test]
 329                 public void CompiledUnBoxing ()
 330                 {
 331                         var p = Expression.Parameter (typeof (object), "o");
 332
 333                         var u = Expression.Lambda<Func<object, int>> (
 334                                 Expression.Convert (p, typeof (int)), p).Compile ();
 335
 336                         Assert.AreEqual (42, u ((object) 42));
 337                 }
 338
 339                 [Test]
 340                 public void CompiledCast ()
 341                 {
 342                         var p = Expression.Parameter (typeof (IFoo), "foo");
 343
 344                         var c = Expression.Lambda<Func<IFoo, Bar>> (
 345                                 Expression.Convert (p, typeof (Bar)), p).Compile ();
 346
 347                         IFoo foo = new Bar ();
 348
 349                         Bar b = c (foo);
 350
 351                         Assert.AreEqual (b, foo);
 352                 }
 353
 354                 [Test]
 355                 public void CompileNotNullableToNullable ()
 356                 {
 357                         var p = Expression.Parameter (typeof (int), "i");
 358                         var c = Expression.Lambda<Func<int, int?>> (
 359                                 Expression.Convert (p, typeof (int?)), p).Compile ();
 360
 361                         Assert.AreEqual ((int?) 0, c (0));
 362                         Assert.AreEqual ((int?) 42, c (42));
 363                 }
 364
 365                 [Test]
 366                 public void CompileNullableToNotNullable ()
 367                 {
 368                         var p = Expression.Parameter (typeof (int?), "i");
 369                         var c = Expression.Lambda<Func<int?, int>> (
 370                                 Expression.Convert (p, typeof (int)), p).Compile ();
 371
 372                         Assert.AreEqual (0, c ((int?) 0));
 373                         Assert.AreEqual (42, c ((int?) 42));
 374
 375                         Action a = () => c (null);
 376
 377                         a.AssertThrows (typeof (InvalidOperationException));
 378                 }
 379
 380                 [Test]
 381                 public void CompiledConvertToSameType ()
 382                 {
 383                         var k = new Klang (42);
 384
 385                         var p = Expression.Parameter (typeof (Klang), "klang");
 386                         var c = Expression.Lambda<Func<Klang, Klang>> (
 387                                 Expression.Convert (
 388                                         p, typeof (Klang)),
 389                                 p).Compile ();
 390
 391                         Assert.AreEqual (k, c (k));
 392                 }
 393
 394                 [Test]
 395                 public void CompiledConvertNullableToNullable ()
 396                 {
 397                         var p = Expression.Parameter (typeof (int?), "i");
 398                         var c = Expression.Lambda<Func<int?, short?>> (
 399                                 Expression.Convert (p, typeof (short?)), p).Compile ();
 400
 401                         Assert.AreEqual ((short?) null, c (null));
 402                         Assert.AreEqual ((short?) 12, c (12));
 403                 }
 404
 405                 [Test]
 406                 public void CompiledNullableBoxing ()
 407                 {
 408                         var p = Expression.Parameter (typeof (int?), "i");
 409                         var c = Expression.Lambda<Func<int?, object>> (
 410                                 Expression.Convert (p, typeof (object)), p).Compile ();
 411
 412                         Assert.AreEqual (null, c (null));
 413                         Assert.AreEqual ((object) (int?) 42, c (42));
 414                 }
 415
 416                 [Test]
 417                 public void CompiledNullableUnboxing ()
 418                 {
 419                         var p = Expression.Parameter (typeof (object), "o");
 420                         var c = Expression.Lambda<Func<object, int?>> (
 421                                 Expression.Convert (p, typeof (int?)), p).Compile ();
 422
 423                         Assert.AreEqual ((int?) null, c (null));
 424                         Assert.AreEqual ((int?) 42, c ((int?) 42));
 425                 }
 426
 427                 [Test]
 428                 public void ChainedNullableConvert ()
 429                 {
 430                         var p = Expression.Parameter (typeof (sbyte?), "a");
 431
 432                         var test = Expression.Lambda<Func<sbyte?, long?>> (
 433                                 Expression.Convert (
 434                                         Expression.Convert (
 435                                                 p,
 436                                                 typeof (int?)),
 437                                         typeof (long?)), p).Compile ();
 438
 439                         Assert.AreEqual ((long?) 3, test ((sbyte?) 3));
 440                         Assert.AreEqual (null, test (null));
 441                 }
 442
 443                 struct ImplicitToShort {
 444                         short value;
 445
 446                         public ImplicitToShort (short v)
 447                         {
 448                                 value = v;
 449                         }
 450
 451                         public static implicit operator short (ImplicitToShort i)
 452                         {
 453                                 return i.value;
 454                         }
 455                 }
 456
 457                 [Test]
 458                 public void ConvertImplicitToShortToNullableInt ()
 459                 {
 460                         var a = Expression.Parameter (typeof (ImplicitToShort?), "a");
 461
 462                         var method = typeof (ImplicitToShort).GetMethod ("op_Implicit");
 463
 464                         var node = Expression.Convert (a, typeof (short), method);
 465                         Assert.IsTrue (node.IsLifted);
 466                         Assert.IsFalse (node.IsLiftedToNull);
 467                         Assert.AreEqual (typeof (short), node.Type);
 468                         Assert.AreEqual (method, node.Method);
 469
 470                         var conv = Expression.Lambda<Func<ImplicitToShort?, int?>> (
 471                                 Expression.Convert (
 472                                         node,
 473                                         typeof (int?)), a).Compile ();
 474
 475                         Assert.AreEqual ((int?) 42, conv (new ImplicitToShort (42)));
 476
 477                         Action convnull = () => Assert.AreEqual (null, conv (null));
 478
 479                         convnull.AssertThrows (typeof (InvalidOperationException));
 480                 }
 481
 482                 [Test]
 483                 public void NullableImplicitToShort ()
 484                 {
 485                         var i = Expression.Parameter (typeof (ImplicitToShort?), "i");
 486
 487                         var method = typeof (ImplicitToShort).GetMethod ("op_Implicit");
 488
 489                         var node = Expression.Convert (i, typeof (short?), method);
 490
 491                         Assert.IsTrue (node.IsLifted);
 492                         Assert.IsTrue (node.IsLiftedToNull);
 493                         Assert.AreEqual (typeof (short?), node.Type);
 494                         Assert.AreEqual (method, node.Method);
 495
 496                         var convert = Expression.Lambda<Func<ImplicitToShort?, short?>> (node, i).Compile ();
 497
 498                         Assert.AreEqual ((short?) 42, convert (new ImplicitToShort (42)));
 499                 }
 500
 501                 [Test]
 502                 public void ConvertLongToDecimal ()
 503                 {
 504                         var p = Expression.Parameter (typeof (long), "l");
 505
 506                         var node = Expression.Convert (p, typeof (decimal));
 507                         Assert.IsFalse (node.IsLifted);
 508                         Assert.IsFalse (node.IsLiftedToNull);
 509                         Assert.AreEqual (typeof (decimal), node.Type);
 510                         Assert.IsNotNull (node.Method);
 511
 512                         var convert = Expression.Lambda<Func<long, decimal>> (node, p).Compile ();
 513
 514                         Assert.AreEqual (42, convert (42));
 515                 }
 516
 517                 [Test]
 518                 public void ConvertNullableULongToNullableDecimal ()
 519                 {
 520                         var p = Expression.Parameter (typeof (ulong?), "l");
 521
 522                         var node = Expression.Convert (p, typeof (decimal?));
 523                         Assert.IsTrue (node.IsLifted);
 524                         Assert.IsTrue (node.IsLiftedToNull);
 525                         Assert.AreEqual (typeof (decimal?), node.Type);
 526                         Assert.IsNotNull (node.Method);
 527
 528                         var convert = Expression.Lambda<Func<ulong?, decimal?>> (node, p).Compile ();
 529
 530                         Assert.AreEqual (42, convert (42));
 531                         Assert.AreEqual (null, convert (null));
 532                 }
 533
 534                 [Test]
 535                 public void ConvertCheckedNullableIntToInt ()
 536                 {
 537                         var p = Expression.Parameter (typeof (int?), "i");
 538
 539                         var node = Expression.ConvertChecked (p, typeof (int));
 540                         Assert.AreEqual (ExpressionType.ConvertChecked, node.NodeType);
 541                         Assert.IsTrue (node.IsLifted);
 542                         Assert.IsFalse (node.IsLiftedToNull);
 543                         Assert.AreEqual (typeof (int), node.Type);
 544                         Assert.IsNull (node.Method);
 545                 }
 546
 547                 struct ImplicitToInt {
 548                         int Value;
 549
 550                         public ImplicitToInt (int v)
 551                         {
 552                                 Value = v;
 553                         }
 554
 555                         public static implicit operator int (ImplicitToInt i)
 556                         {
 557                                 return i.Value;
 558                         }
 559                 }
 560
 561                 [Test]
 562                 public void ConvertNullableImplictToIntToNullableLong ()
 563                 {
 564                         var i = Expression.Parameter (typeof (ImplicitToInt?), "i");
 565
 566                         var method = typeof (ImplicitToInt).GetMethod ("op_Implicit");
 567
 568                         var node = Expression.Convert (i, typeof (int), method);
 569                         node = Expression.Convert (node, typeof (long?));
 570                         var conv = Expression.Lambda<Func<ImplicitToInt?, long?>> (node, i).Compile ();
 571
 572                         Assert.AreEqual ((long?) 42, conv (new ImplicitToInt (42)));
 573                         Action convnull = () => Assert.AreEqual (null, conv (null));
 574                         convnull.AssertThrows (typeof (InvalidOperationException));
 575                 }
 576
 577                 [Test]
 578                 [ExpectedException (typeof (InvalidOperationException))]
 579                 [Category ("NotWorking")]
 580                 public void ConvertNullableIntToStringWithConvertMethod ()
 581                 {
 582                         Expression.Convert (
 583                                 Expression.Constant ((int?) 0),
 584                                 typeof (string),
 585                                 typeof (Convert).GetMethod ("ToString", new [] { typeof (object) }));
 586                 }
 587         }
 588 }