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 && !MONOTOUCH
  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                 public void CallMethodOnStruct ()
 231                 {
 232                         var param = Expression.Parameter (typeof (EineStrukt), "s");
 233                         var foo = Expression.Lambda<Func<EineStrukt, string>> (
 234                                 Expression.Call (param, typeof (EineStrukt).GetMethod ("GimmeFoo")), param).Compile ();
 235
 236                         var s = new EineStrukt ("foo");
 237                         Assert.AreEqual ("foo", foo (s));
 238                 }
 239
 240                 public static int OneStaticMethod ()
 241                 {
 242                         return 42;
 243                 }
 244
 245                 [Test]
 246                 [Category ("NotDotNet")] // http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=339351
 247                 [ExpectedException (typeof (ArgumentException))]
 248                 public void CallStaticMethodOnNonSenseInstanceExpression ()
 249                 {
 250                         Expression.Call (
 251                                 Expression.Constant ("la la la"),
 252                                 this.GetType ().GetMethod ("OneStaticMethod"));
 253                 }
 254
 255                 public static int DoSomethingWith (ref int a)
 256                 {
 257                         return a + 4;
 258                 }
 259
 260                 public static string DoAnotherThing (ref int a, string s)
 261                 {
 262                         return s + a;
 263                 }
 264
 265                 [Test]
 266                 public void CallStaticMethodWithRefParameter ()
 267                 {
 268                         var p = Expression.Parameter (typeof (int), "i");
 269
 270                         var c = Expression.Lambda<Func<int, int>> (
 271                                 Expression.Call (GetType ().GetMethod ("DoSomethingWith"), p), p).Compile ();
 272
 273                         Assert.AreEqual (42, c (38));
 274                 }
 275
 276                 [Test]
 277                 public void CallStaticMethodWithRefParameterAndOtherParameter ()
 278                 {
 279                         var i = Expression.Parameter (typeof (int), "i");
 280                         var s = Expression.Parameter (typeof (string), "s");
 281
 282                         var lamda = Expression.Lambda<Func<int, string, string>> (
 283                                 Expression.Call (GetType ().GetMethod ("DoAnotherThing"), i, s), i, s).Compile ();
 284
 285                         Assert.AreEqual ("foo42", lamda (42, "foo"));
 286                 }
 287
 288                 public static int Bang (Expression i)
 289                 {
 290                         return (int) (i as ConstantExpression).Value;
 291                 }
 292 #if !NET_4_0 // dlr bug 5875
 293                 [Test]
 294                 public void CallMethodWithExpressionParameter ()
 295                 {
 296                         var call = Expression.Call (GetType ().GetMethod ("Bang"), Expression.Constant (42));
 297                         Assert.AreEqual (ExpressionType.Quote, call.Arguments [0].NodeType);
 298
 299                         var l = Expression.Lambda<Func<int>> (call).Compile ();
 300
 301                         Assert.AreEqual (42, l ());
 302                 }
 303 #endif
 304                 static bool fout_called = false;
 305
 306                 public static int FooOut (out int x)
 307                 {
 308                         fout_called = true;
 309                         return x = 0;
 310                 }
 311
 312                 [Test]
 313                 public void Connect282729 ()
 314                 {
 315                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=282729
 316
 317                         var p = Expression.Parameter (typeof (int), "p");
 318                         var lambda = Expression.Lambda<Func<int, int>> (
 319                                 Expression.Call (
 320                                         GetType ().GetMethod ("FooOut"),
 321                                         Expression.ArrayIndex(
 322                                                 Expression.NewArrayBounds (
 323                                                         typeof(int),
 324                                                         1.ToConstant ()),
 325                                                 0.ToConstant ())),
 326                                 p).Compile ();
 327
 328                         Assert.AreEqual (0, lambda (0));
 329                         Assert.IsTrue (fout_called);
 330                 }
 331
 332                 public static int FooOut2 (out int x)
 333                 {
 334                         x = 2;
 335                         return 3;
 336                 }
 337
 338                 [Test]
 339                 [Category ("NotWorking")]
 340                 public void Connect290278 ()
 341                 {
 342                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=290278
 343
 344                         var p = Expression.Parameter (typeof (int [,]), "p");
 345                         var lambda = Expression.Lambda<Func<int [,], int>> (
 346                                 Expression.Call (
 347                                         GetType ().GetMethod ("FooOut2"),
 348                                         Expression.ArrayIndex (p, 0.ToConstant (), 0.ToConstant ())),
 349                                 p).Compile ();
 350
 351                         int [,] data = { { 1 } };
 352
 353                         Assert.AreEqual (3, lambda (data));
 354                         Assert.AreEqual (2, data [0, 0]);
 355                 }
 356
 357                 public static void FooRef (ref string s)
 358                 {
 359                 }
 360
 361                 [Test]
 362                 public void Connect297597 ()
 363                 {
 364                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=297597
 365
 366                         var strings = new string [1];
 367
 368                         var lambda = Expression.Lambda<Action> (
 369                                 Expression.Call (
 370                                         GetType ().GetMethod ("FooRef"),
 371                                         Expression.ArrayIndex (
 372                                                 Expression.Constant (strings), 0.ToConstant ()))).Compile ();
 373
 374                         lambda ();
 375                 }
 376
 377                 [Test]
 378 #if MONOTOUCH
 379                 [Category ("NotWorking")]
 380 #endif
 381                 [Category ("NotDotNet")] // https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=319190
 382                 public void Connect319190 ()
 383                 {
 384                         var lambda = Expression.Lambda<Func<bool>> (
 385                                 Expression.TypeIs (
 386                                         Expression.New (typeof (TypedReference)),
 387                                         typeof (object))).Compile ();
 388
 389                         Assert.IsTrue (lambda ());
 390                 }
 391
 392                 public static int Truc ()
 393                 {
 394                         return 42;
 395                 }
 396
 397                 [Test]
 398                 public void Connect282702 ()
 399                 {
 400                         var lambda = Expression.Lambda<Func<Func<int>>> (
 401                                 Expression.Convert (
 402                                         Expression.Call (
 403                                                 typeof (Delegate).GetMethod ("CreateDelegate", new [] { typeof (Type), typeof (object), typeof (MethodInfo) }),
 404                                                 Expression.Constant (typeof (Func<int>), typeof (Type)),
 405                                                 Expression.Constant (null, typeof (object)),
 406                                                 Expression.Constant (GetType ().GetMethod ("Truc"))),
 407                                         typeof (Func<int>))).Compile ();
 408
 409                         Assert.AreEqual (42, lambda ().Invoke ());
 410                 }
 411
 412                 [Test]
 413                 public void CallQueryableWhere ()
 414                 {
 415                         var queryable = new [] { 1, 2, 3 }.AsQueryable ();
 416
 417                         var parameter = Expression.Parameter (typeof (int), "i");
 418                         var lambda = Expression.Lambda<Func<int, bool>> (
 419                                 Expression.LessThan (parameter, Expression.Constant (2)),
 420                                 parameter);
 421
 422                         var selector = Expression.Quote (lambda);
 423
 424                         var call = Expression.Call (
 425                                 typeof (Queryable),
 426                                 "Where",
 427                                 new [] { typeof (int) },
 428                                 queryable.Expression,
 429                                 selector);
 430
 431                         Assert.IsNotNull (call);
 432                         Assert.IsNotNull (call.Method);
 433                 }
 434
 435                 [Test]
 436                 public void CallAsQueryable () // #537768
 437                 {
 438                         var constant = Expression.Constant (
 439                                 new List<string> (),
 440                                 typeof (IEnumerable<string>));
 441
 442                         var call = Expression.Call (
 443                                 typeof (Queryable),
 444                                 "AsQueryable",
 445                                 new [] { typeof (string) },
 446                                 constant);
 447
 448                         Assert.IsNotNull (call);
 449                         Assert.AreEqual (1, call.Arguments.Count);
 450                         Assert.AreEqual (constant, call.Arguments [0]);
 451
 452                         var method = call.Method;
 453
 454                         Assert.AreEqual ("AsQueryable", method.Name);
 455                         Assert.IsTrue (method.IsGenericMethod);
 456                         Assert.AreEqual (typeof (string), method.GetGenericArguments () [0]);
 457                 }
 458
 459
 460                 [Test]
 461                 public void CallQueryableSelect () // #536637
 462                 {
 463                         var parameter = Expression.Parameter (typeof (string), "s");
 464                         var string_length = Expression.Property (parameter, typeof (string).GetProperty ("Length"));
 465                         var lambda = Expression.Lambda (string_length, parameter);
 466
 467                         var strings = new [] { "1", "22", "333" };
 468
 469                         var call = Expression.Call (
 470                                 typeof (Queryable),
 471                                 "Select",
 472                                 new [] { typeof (string), typeof (int) },
 473                                 Expression.Constant (strings.AsQueryable ()),
 474                                 lambda);
 475
 476                         Assert.IsNotNull (call);
 477
 478                         var method = call.Method;
 479
 480                         Assert.AreEqual ("Select", method.Name);
 481                         Assert.IsTrue (method.IsGenericMethod);
 482                         Assert.AreEqual (typeof (string), method.GetGenericArguments () [0]);
 483                         Assert.AreEqual (typeof (int), method.GetGenericArguments () [1]);
 484                 }
 485
 486                 [Test]
 487 #if MONOTOUCH
 488                 [Category ("NotWorking")]
 489 #endif
 490                 public void CallNullableGetValueOrDefault () // #568989
 491                 {
 492                         var value = Expression.Parameter (typeof (int?), "value");
 493                         var default_parameter = Expression.Parameter (typeof (int), "default");
 494
 495                         var getter = Expression.Lambda<Func<int?, int, int>> (
 496                                 Expression.Call (
 497                                         value,
 498                                         "GetValueOrDefault",
 499                                         Type.EmptyTypes,
 500                                         default_parameter),
 501                                 value,
 502                                 default_parameter).Compile ();
 503
 504                         Assert.AreEqual (2, getter (null, 2));
 505                         Assert.AreEqual (4, getter (4, 2));
 506                 }
 507
 508                 [Test]
 509                 public void CallToStringOnEnum () // #625367
 510                 {
 511                         var lambda = Expression.Lambda<Func<string>> (
 512                                 Expression.Call (
 513                                         Expression.Constant (TypeCode.Boolean, typeof (TypeCode)),
 514                                         typeof (object).GetMethod ("ToString"))).Compile ();
 515
 516                         Assert.AreEqual ("Boolean", lambda ());
 517                 }
 518
 519                 public static void AcceptsIEnumerable(IEnumerable<object> o)
 520                 {
 521                 }
 522
 523                 [Test]
 524                 public void CallIQueryableMethodWithNewArrayBoundExpression () // #2304
 525                 {
 526                         Expression.Call (
 527                                 GetType ().GetMethod ("AcceptsIEnumerable", BindingFlags.Public | BindingFlags.Static),
 528                                 Expression.NewArrayBounds (typeof (object), Expression.Constant (0)));
 529                 }
 530         }
 531 }