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

   1 //
   2 // ExpressionTest_Call.cs
   3 //
   4 // Author:
   5 //   Federico Di Gregorio <fog@initd.org>
   6 //   Jb Evain (jbevain@novell.com)
   7 //
   8 // (C) 2008 Novell, Inc. (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System;
  31 using System.Reflection;
  32 using System.Collections.Generic;
  33 using System.Linq;
  34 using System.Linq.Expressions;
  35 using NUnit.Framework;
  36
  37 namespace MonoTests.System.Linq.Expressions {
  38
  39         [TestFixture]
  40         public class ExpressionTest_Call {
  41
  42                 [Test]
  43                 [ExpectedException (typeof (ArgumentNullException))]
  44                 public void Arg1Null ()
  45                 {
  46                         Expression.Call ((Type)null, "TestMethod", null, Expression.Constant (1));
  47                 }
  48
  49                 [Test]
  50                 [ExpectedException (typeof (ArgumentNullException))]
  51                 public void Arg2Null ()
  52                 {
  53                         Expression.Call (typeof (MemberClass), null, null, Expression.Constant (1));
  54                 }
  55
  56                 [Test]
  57                 [ExpectedException (typeof (InvalidOperationException))]
  58                 public void Arg4WrongType ()
  59                 {
  60                         Expression.Call (typeof (MemberClass), "StaticMethod", null, Expression.Constant (true));
  61                 }
  62
  63                 [Test]
  64                 [ExpectedException (typeof (InvalidOperationException))]
  65                 public void InstanceMethod ()
  66                 {
  67                         Expression.Call (typeof (MemberClass), "TestMethod", null, Expression.Constant (1));
  68                 }
  69
  70                 [Test]
  71                 public void StaticMethod ()
  72                 {
  73                         Expression.Call (typeof (MemberClass), "StaticMethod", null, Expression.Constant (1));
  74                 }
  75
  76                 [Test]
  77                 public void StaticGenericMethod ()
  78                 {
  79                         Expression.Call (typeof (MemberClass), "StaticGenericMethod", new [] { typeof (int) }, Expression.Constant (1));
  80                 }
  81
  82                 [Test]
  83                 [ExpectedException (typeof (ArgumentNullException))]
  84                 public void ArgMethodNull ()
  85                 {
  86                         Expression.Call (Expression.Constant (new object ()), null);
  87                 }
  88
  89                 [Test]
  90 #if NET_4_0
  91                 [ExpectedException (typeof (ArgumentException))]
  92 #else
  93                 [ExpectedException (typeof (ArgumentNullException))]
  94 #endif
  95                 public void ArgInstanceNullForNonStaticMethod ()
  96                 {
  97                         Expression.Call (null, typeof (object).GetMethod ("ToString"));
  98                 }
  99
 100                 [Test]
 101                 [ExpectedException (typeof (ArgumentException))]
 102                 public void InstanceTypeDoesntMatchMethodDeclaringType ()
 103                 {
 104                         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                 public void CallMethodOnStruct ()
 227                 {
 228                         var param = Expression.Parameter (typeof (EineStrukt), "s");
 229                         var foo = Expression.Lambda<Func<EineStrukt, string>> (
 230                                 Expression.Call (param, typeof (EineStrukt).GetMethod ("GimmeFoo")), param).Compile ();
 231
 232                         var s = new EineStrukt ("foo");
 233                         Assert.AreEqual ("foo", foo (s));
 234                 }
 235
 236                 public static int OneStaticMethod ()
 237                 {
 238                         return 42;
 239                 }
 240
 241                 [Test]
 242                 [Category ("NotDotNet")] // http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=339351
 243                 [ExpectedException (typeof (ArgumentException))]
 244                 public void CallStaticMethodOnNonSenseInstanceExpression ()
 245                 {
 246                         Expression.Call (
 247                                 Expression.Constant ("la la la"),
 248                                 this.GetType ().GetMethod ("OneStaticMethod"));
 249                 }
 250
 251                 public static int DoSomethingWith (ref int a)
 252                 {
 253                         return a + 4;
 254                 }
 255
 256                 public static string DoAnotherThing (ref int a, string s)
 257                 {
 258                         return s + a;
 259                 }
 260
 261                 [Test]
 262                 public void CallStaticMethodWithRefParameter ()
 263                 {
 264                         var p = Expression.Parameter (typeof (int), "i");
 265
 266                         var c = Expression.Lambda<Func<int, int>> (
 267                                 Expression.Call (GetType ().GetMethod ("DoSomethingWith"), p), p).Compile ();
 268
 269                         Assert.AreEqual (42, c (38));
 270                 }
 271
 272                 [Test]
 273                 public void CallStaticMethodWithRefParameterAndOtherParameter ()
 274                 {
 275                         var i = Expression.Parameter (typeof (int), "i");
 276                         var s = Expression.Parameter (typeof (string), "s");
 277
 278                         var lamda = Expression.Lambda<Func<int, string, string>> (
 279                                 Expression.Call (GetType ().GetMethod ("DoAnotherThing"), i, s), i, s).Compile ();
 280
 281                         Assert.AreEqual ("foo42", lamda (42, "foo"));
 282                 }
 283
 284                 public static int Bang (Expression i)
 285                 {
 286                         return (int) (i as ConstantExpression).Value;
 287                 }
 288 #if !NET_4_0 // dlr bug 5875
 289                 [Test]
 290                 public void CallMethodWithExpressionParameter ()
 291                 {
 292                         var call = Expression.Call (GetType ().GetMethod ("Bang"), Expression.Constant (42));
 293                         Assert.AreEqual (ExpressionType.Quote, call.Arguments [0].NodeType);
 294
 295                         var l = Expression.Lambda<Func<int>> (call).Compile ();
 296
 297                         Assert.AreEqual (42, l ());
 298                 }
 299 #endif
 300                 static bool fout_called = false;
 301
 302                 public static int FooOut (out int x)
 303                 {
 304                         fout_called = true;
 305                         return x = 0;
 306                 }
 307
 308                 [Test]
 309                 public void Connect282729 ()
 310                 {
 311                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=282729
 312
 313                         var p = Expression.Parameter (typeof (int), "p");
 314                         var lambda = Expression.Lambda<Func<int, int>> (
 315                                 Expression.Call (
 316                                         GetType ().GetMethod ("FooOut"),
 317                                         Expression.ArrayIndex(
 318                                                 Expression.NewArrayBounds (
 319                                                         typeof(int),
 320                                                         1.ToConstant ()),
 321                                                 0.ToConstant ())),
 322                                 p).Compile ();
 323
 324                         Assert.AreEqual (0, lambda (0));
 325                         Assert.IsTrue (fout_called);
 326                 }
 327
 328                 public static int FooOut2 (out int x)
 329                 {
 330                         x = 2;
 331                         return 3;
 332                 }
 333
 334                 [Test]
 335                 [Category ("NotWorking")]
 336                 public void Connect290278 ()
 337                 {
 338                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=290278
 339
 340                         var p = Expression.Parameter (typeof (int [,]), "p");
 341                         var lambda = Expression.Lambda<Func<int [,], int>> (
 342                                 Expression.Call (
 343                                         GetType ().GetMethod ("FooOut2"),
 344                                         Expression.ArrayIndex (p, 0.ToConstant (), 0.ToConstant ())),
 345                                 p).Compile ();
 346
 347                         int [,] data = { { 1 } };
 348
 349                         Assert.AreEqual (3, lambda (data));
 350                         Assert.AreEqual (2, data [0, 0]);
 351                 }
 352
 353                 public static void FooRef (ref string s)
 354                 {
 355                 }
 356
 357                 [Test]
 358                 public void Connect297597 ()
 359                 {
 360                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=297597
 361
 362                         var strings = new string [1];
 363
 364                         var lambda = Expression.Lambda<Action> (
 365                                 Expression.Call (
 366                                         GetType ().GetMethod ("FooRef"),
 367                                         Expression.ArrayIndex (
 368                                                 Expression.Constant (strings), 0.ToConstant ()))).Compile ();
 369
 370                         lambda ();
 371                 }
 372
 373                 [Test]
 374                 [Category ("NotDotNet")] // https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=319190
 375                 public void Connect319190 ()
 376                 {
 377                         var lambda = Expression.Lambda<Func<bool>> (
 378                                 Expression.TypeIs (
 379                                         Expression.New (typeof (TypedReference)),
 380                                         typeof (object))).Compile ();
 381
 382                         Assert.IsTrue (lambda ());
 383                 }
 384
 385                 public static int Truc ()
 386                 {
 387                         return 42;
 388                 }
 389
 390                 [Test]
 391                 public void Connect282702 ()
 392                 {
 393                         var lambda = Expression.Lambda<Func<Func<int>>> (
 394                                 Expression.Convert (
 395                                         Expression.Call (
 396                                                 typeof (Delegate).GetMethod ("CreateDelegate", new [] { typeof (Type), typeof (object), typeof (MethodInfo) }),
 397                                                 Expression.Constant (typeof (Func<int>), typeof (Type)),
 398                                                 Expression.Constant (null, typeof (object)),
 399                                                 Expression.Constant (GetType ().GetMethod ("Truc"))),
 400                                         typeof (Func<int>))).Compile ();
 401
 402                         Assert.AreEqual (42, lambda ().Invoke ());
 403                 }
 404
 405                 [Test]
 406                 public void CallQueryableWhere ()
 407                 {
 408                         var queryable = new [] { 1, 2, 3 }.AsQueryable ();
 409
 410                         var parameter = Expression.Parameter (typeof (int), "i");
 411                         var lambda = Expression.Lambda<Func<int, bool>> (
 412                                 Expression.LessThan (parameter, Expression.Constant (2)),
 413                                 parameter);
 414
 415                         var selector = Expression.Quote (lambda);
 416
 417                         var call = Expression.Call (
 418                                 typeof (Queryable),
 419                                 "Where",
 420                                 new [] { typeof (int) },
 421                                 queryable.Expression,
 422                                 selector);
 423
 424                         Assert.IsNotNull (call);
 425                         Assert.IsNotNull (call.Method);
 426                 }
 427
 428                 [Test]
 429                 public void CallAsQueryable () // #537768
 430                 {
 431                         var constant = Expression.Constant (
 432                                 new List<string> (),
 433                                 typeof (IEnumerable<string>));
 434
 435                         var call = Expression.Call (
 436                                 typeof (Queryable),
 437                                 "AsQueryable",
 438                                 new [] { typeof (string) },
 439                                 constant);
 440
 441                         Assert.IsNotNull (call);
 442                         Assert.AreEqual (1, call.Arguments.Count);
 443                         Assert.AreEqual (constant, call.Arguments [0]);
 444
 445                         var method = call.Method;
 446
 447                         Assert.AreEqual ("AsQueryable", method.Name);
 448                         Assert.IsTrue (method.IsGenericMethod);
 449                         Assert.AreEqual (typeof (string), method.GetGenericArguments () [0]);
 450                 }
 451
 452
 453                 [Test]
 454                 public void CallQueryableSelect () // #536637
 455                 {
 456                         var parameter = Expression.Parameter (typeof (string), "s");
 457                         var string_length = Expression.Property (parameter, typeof (string).GetProperty ("Length"));
 458                         var lambda = Expression.Lambda (string_length, parameter);
 459
 460                         var strings = new [] { "1", "22", "333" };
 461
 462                         var call = Expression.Call (
 463                                 typeof (Queryable),
 464                                 "Select",
 465                                 new [] { typeof (string), typeof (int) },
 466                                 Expression.Constant (strings.AsQueryable ()),
 467                                 lambda);
 468
 469                         Assert.IsNotNull (call);
 470
 471                         var method = call.Method;
 472
 473                         Assert.AreEqual ("Select", method.Name);
 474                         Assert.IsTrue (method.IsGenericMethod);
 475                         Assert.AreEqual (typeof (string), method.GetGenericArguments () [0]);
 476                         Assert.AreEqual (typeof (int), method.GetGenericArguments () [1]);
 477                 }
 478
 479                 [Test]
 480                 public void CallNullableGetValueOrDefault () // #568989
 481                 {
 482                         var value = Expression.Parameter (typeof (int?), "value");
 483                         var default_parameter = Expression.Parameter (typeof (int), "default");
 484
 485                         var getter = Expression.Lambda<Func<int?, int, int>> (
 486                                 Expression.Call (
 487                                         value,
 488                                         "GetValueOrDefault",
 489                                         Type.EmptyTypes,
 490                                         default_parameter),
 491                                 value,
 492                                 default_parameter).Compile ();
 493
 494                         Assert.AreEqual (2, getter (null, 2));
 495                         Assert.AreEqual (4, getter (4, 2));
 496                 }
 497         }
 498 }