mcs/class/corlib/Test/System.Reflection.Emit/CustomAttributeBuilderTest.cs

   1 // CustomAttributeBuilderTest.cs
   2 //
   3 // Author: Vineeth N <nvineeth@yahoo.com>
   4 //
   5 // (C) 2004 Ximian, Inc. http://www.ximian.com
   6 //
   7 using System;
   8 using System.Reflection;
   9 using System.Reflection.Emit;
  10 using System.Threading;
  11 using NUnit.Framework;
  12
  13 namespace MonoTests.System.Reflection.Emit
  14 {
  15         /// <summary>
  16         /// TestFixture for CustomAttributeBuilderTest.
  17         /// The members to be tested are as follows:
  18         /// 4 constructors:
  19         /// 1) public CustomAttributeBuilder(ConstructorInfo, object[]);
  20         /// 2) public CustomAttributeBuilder(ConstructorInfo, object[], FieldInfo[], object[]);
  21         /// 3) public CustomAttributeBuilder(ConstructorInfo, object[], PropertyInfo[], object[]);
  22         /// 4) public CustomAttributeBuilder(ConstructorInfo, object[], PropertyInfo[], object[], FieldInfo[], object[]);
  23         /// and the exceptions that are thrown.
  24         /// In the implementation , it can be seen that the first
  25         /// three type of  constructors call the 4th type of ctor, which takes 6 args
  26         /// by filling args and substituting null as required.
  27         /// For testing constructors we have use 4 different test functions,
  28         /// Various exceptions have been checked for 4th type of consturctor.
  29         /// </summary>
  30
  31         [TestFixture]
  32         public class CustomAttributeBuilderTest : Assertion
  33         {
  34
  35                 // the CustomAttribute class is used for testing and it has to be public
  36                 //since it will be associated with a class that belongs to another assembly
  37
  38                 [AttributeUsage(AttributeTargets.Method | AttributeTargets.Field | AttributeTargets.Class)]
  39                 public class CustomAttribute: Attribute
  40                 {
  41                         private string attr1;
  42                         private string attr2;
  43                         public string Feild; //used for testing the second type of constructor
  44
  45                         public CustomAttribute () {}
  46                         public CustomAttribute (String s1 , String s2)
  47                         {
  48                                 attr1 = s1;
  49                                 attr2=s2;
  50                         }
  51
  52                         private CustomAttribute (String s1) {}
  53                         static CustomAttribute () {}
  54
  55                         public string AttributeOne
  56                         {
  57                                 get { return attr1; }
  58                                 set { attr1 = value; }
  59                         }
  60
  61                         public string AttributeTwo
  62                         {
  63                                 get { return attr2; }
  64                                 //the set is skipped and is used later in testing
  65                         }
  66
  67                 }
  68
  69                 private class TempClass
  70                 {
  71                         //used for testing the ArgumentException
  72                         public string Field;
  73                         public string FieldProperty
  74                         {
  75                                 get { return Field; }
  76                                 set { Field = value; }
  77                         }
  78                 }
  79
  80
  81
  82
  83                 [Test]
  84                 public void CtorOneTest ()
  85                 {
  86                         //test for the constructor with signature--
  87                         // public CustomAttributeBuilder(ConstructorInfo, object[]);
  88                         /*
  89                          * WE build a imaginary type as follows
  90                          * class TestType
  91                          * {
  92                          *      [CustomAttribute("one","two")]
  93                          *      public string Str;
  94                          *
  95                          *      [CustomAttribute("hello","world")]
  96                          *      public void Print()
  97                          *      {Console.WriteLine("Hello World"); }
  98                          *
  99                          * }
 100                          * And then check for the validity of attributes in the test functions
 101                          */
 102                         AssemblyName asmName = new AssemblyName ();
 103                         asmName.Name = "TestAssembly.dll";
 104
 105                         AssemblyBuilder asmBuilder = Thread.GetDomain ().DefineDynamicAssembly (
 106                                 asmName , AssemblyBuilderAccess.Run);
 107
 108                         ModuleBuilder modBuilder = asmBuilder.DefineDynamicModule ("TestModule");
 109
 110                         TypeBuilder typeBuilder = modBuilder.DefineType ("TestType",
 111                                 TypeAttributes.Public);
 112
 113                         Type[] ctorParams = new Type[] { typeof (string),typeof (string) };
 114
 115                         ConstructorInfo classCtorInfo =
 116                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 117
 118                         CustomAttributeBuilder feildCABuilder = new CustomAttributeBuilder (
 119                                 classCtorInfo,
 120                                 new object [] { "one","two" }
 121                                 ),
 122                                 methodCABuilder = new CustomAttributeBuilder (
 123                                 classCtorInfo,
 124                                 new object [] { "hello","world" }
 125                                 );
 126                         //now let's build a feild of type string and associate a attribute with it
 127                         FieldBuilder fieldBuilder= typeBuilder.DefineField ("Str",
 128                                 typeof (string), FieldAttributes.Public);
 129                         fieldBuilder.SetCustomAttribute (feildCABuilder);
 130                         //now build a method
 131                         MethodBuilder methodBuilder= typeBuilder.DefineMethod ("Print",
 132                                 MethodAttributes.Public, null, null);
 133                         methodBuilder.SetCustomAttribute (methodCABuilder);
 134                         ILGenerator methodIL = methodBuilder.GetILGenerator ();
 135                         methodIL.EmitWriteLine ("Hello, world!");
 136                         methodIL.Emit (OpCodes.Ret);
 137
 138                         // create the type
 139                         Type myType = typeBuilder.CreateType ();
 140
 141                         //Now check for the validity of the attributes.
 142                         object testInstance = Activator.CreateInstance (myType);
 143
 144                         //check the validity of the attribute associated with Print method
 145
 146                         object [] methodAttrs =  myType.GetMember ("Print") [0].GetCustomAttributes (true);
 147                         AssertEquals ("#method Print has exactly one attribute", methodAttrs.Length, 1);
 148                         CustomAttribute methodAttr = methodAttrs [0] as CustomAttribute;
 149                         AssertEquals ("#AttributeOne", methodAttr.AttributeOne, "hello");
 150                         AssertEquals ("#AttributeTwo", methodAttr.AttributeTwo, "world");
 151
 152                         //check the validity of the attribute associated with Str feild
 153
 154                         object [] fieldAttrs = myType.GetField ("Str").GetCustomAttributes (true);
 155                         AssertEquals("#feild Str has exactly one attribute", fieldAttrs.Length, 1);
 156                         CustomAttribute fieldAttr = fieldAttrs [0] as CustomAttribute;
 157                         AssertEquals("#AttributeOne", fieldAttr.AttributeOne, "one");
 158                         AssertEquals("#AttributeTwo", fieldAttr.AttributeTwo, "two");
 159                 }
 160
 161                 [Test]
 162                 public void CtorTwoTest ()
 163                 {
 164                         //test for the constructor with signature--
 165                         // CustomAttributeBuilder Constructor (ConstructorInfo, Object[], FieldInfo[], Object[]) ;
 166                         /*
 167                          * WE build a imaginary type as follows
 168                          * [CustomAttribute("Test","Type")]
 169                          * public class TestType
 170                          * {
 171                          *
 172                          * }
 173                          * We also set the "Feild" of class CustomAttribute and the value;
 174                          * And then check for the validity of attributes in the test functions
 175                          */
 176
 177                         AssemblyName asmName = new AssemblyName ();
 178                         asmName.Name = "TestAssembly.dll";
 179
 180                         AssemblyBuilder asmBuilder = Thread.GetDomain ().DefineDynamicAssembly (
 181                                 asmName, AssemblyBuilderAccess.Run);
 182
 183                         ModuleBuilder modBuilder = asmBuilder.DefineDynamicModule ("TestModule");
 184
 185                         TypeBuilder typeBuilder = modBuilder.DefineType ("TestType",
 186                                 TypeAttributes.Public);
 187
 188                         Type [] ctorParams = new Type [] { typeof (string), typeof (string) };
 189
 190                         ConstructorInfo classCtorInfo =
 191                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 192
 193                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 194                                 classCtorInfo,
 195                                 new object [] { "Test","Type" },
 196                                 typeof(CustomAttribute).GetFields(),
 197                                 new object [] { "TestCase" }
 198                                 );
 199
 200                         typeBuilder.SetCustomAttribute (typeCABuilder);
 201
 202                         // create the type
 203                         Type myType = typeBuilder.CreateType ();
 204
 205                         //Now check for the validity of the attributes.
 206                         object testInstance = Activator.CreateInstance (myType);
 207
 208                         //check the validity of the attribute associated with Print method
 209                         object [] customAttrs = myType.GetCustomAttributes (false);
 210                         AssertEquals ("#TestType has exactly one attribute", customAttrs.Length, 1);
 211
 212                         //Custom Attributes of TestType
 213                         CustomAttribute attr = customAttrs [0] as CustomAttribute;
 214                         AssertEquals ("#AttributeOne", attr.AttributeOne, "Test");
 215                         AssertEquals ("#AttributeTwo", attr.AttributeTwo, "Type");
 216                         AssertEquals ("#CustomAttribute.Feild",attr.Feild, "TestCase");
 217
 218                 }
 219
 220                 [Test]
 221                 public void CtorThreeTest ()
 222                 {
 223                         //test for the constructor with signature--
 224                         // CustomAttributeBuilder Constructor (ConstructorInfo, Object[], PropertyInfo[], Object[]) ;
 225                         /*
 226                          * WE build a imaginary type as follows
 227                          * [CustomAttribute()]
 228                          * public class TestType
 229                          * {
 230                          *
 231                          * }
 232                          * We also set the "AttributeOne" of class CustomAttribute by means of the constuctor
 233                          * And then check for the validity of attribute state
 234                          */
 235
 236                         AssemblyName asmName = new AssemblyName ();
 237                         asmName.Name = "TestAssembly.dll";
 238
 239                         AssemblyBuilder asmBuilder = Thread.GetDomain ().DefineDynamicAssembly (
 240                                 asmName, AssemblyBuilderAccess.Run);
 241
 242                         ModuleBuilder modBuilder = asmBuilder.DefineDynamicModule ("TestModule");
 243
 244                         TypeBuilder typeBuilder = modBuilder.DefineType ("TestType",
 245                                 TypeAttributes.Public);
 246
 247                         Type [] ctorParams = new Type [] { };
 248
 249                         ConstructorInfo classCtorInfo =
 250                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 251
 252                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 253                                 classCtorInfo,
 254                                 new object [] { },
 255                                 new PropertyInfo []{ typeof (CustomAttribute).GetProperty ("AttributeOne") },
 256                                 new object [] { "TestCase" }
 257                                 );
 258
 259                         typeBuilder.SetCustomAttribute (typeCABuilder);
 260
 261                         // create the type
 262                         Type myType = typeBuilder.CreateType ();
 263
 264                         //Now check for the validity of the attributes.
 265                         object testInstance = Activator.CreateInstance (myType);
 266
 267                         //check the validity of the attribute associated with Print method
 268                         object [] customAttrs = myType.GetCustomAttributes (false);
 269                         AssertEquals ("#TestType has exactly one attribute", customAttrs.Length , 1);
 270
 271                         //Custom Attributes of TestType
 272                         CustomAttribute attr = customAttrs [0] as CustomAttribute;
 273                         AssertEquals("#AttributeOne", attr.AttributeOne, "TestCase");
 274                 }
 275
 276                 [Test]
 277                 public void CtorFourTest ()
 278                 {
 279                         //test for the constructor with signature--
 280                         //public CustomAttributeBuilder(ConstructorInfo, object[], PropertyInfo[], object[], FieldInfo[], object[]);
 281                         /*
 282                          * WE build a imaginary type as follows
 283                          * [CustomAttribute()]
 284                          * public class TestType
 285                          * {
 286                          *
 287                          * }
 288                          * We also set the "AttributeOne" property ,
 289                          * and "Feild" of class CustomAttribute
 290                          * by means of the constuctor of CustomAttributeBuilder
 291                          * And then check for the validity
 292                          */
 293
 294                         AssemblyName asmName = new AssemblyName ();
 295                         asmName.Name = "TestAssembly.dll";
 296
 297                         AssemblyBuilder asmBuilder = Thread.GetDomain ().DefineDynamicAssembly (
 298                                 asmName , AssemblyBuilderAccess.Run);
 299
 300                         ModuleBuilder modBuilder = asmBuilder.DefineDynamicModule ("TestModule");
 301
 302                         TypeBuilder typeBuilder = modBuilder.DefineType ("TestType",
 303                                 TypeAttributes.Public);
 304
 305                         Type [] ctorParams = new Type [] { };
 306
 307                         ConstructorInfo classCtorInfo =
 308                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 309
 310                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder(
 311                                 classCtorInfo,
 312                                 new object [] { },
 313                                 new PropertyInfo []{ typeof (CustomAttribute).GetProperty ("AttributeOne") },
 314                                 new object [] { "TestCase" },
 315                                 typeof(CustomAttribute).GetFields (),
 316                                 new object [] { "FieldValue" }
 317                                 );
 318
 319                         typeBuilder.SetCustomAttribute (typeCABuilder);
 320
 321                         // create the type
 322                         Type myType = typeBuilder.CreateType ();
 323
 324                         //Now check for the validity of the attributes.
 325                         object testInstance = Activator.CreateInstance (myType);
 326
 327                         //check the validity of the attribute associated with Print method
 328                         object [] customAttrs = myType.GetCustomAttributes (false);
 329                         AssertEquals("#TestType has exactly one attribute",customAttrs.Length , 1);
 330
 331                         //Custom Attributes of TestType
 332                         CustomAttribute attr = customAttrs [0] as CustomAttribute;
 333                         AssertEquals ("#AttributeOne", attr.AttributeOne, "TestCase");
 334                         AssertEquals ("#Field ", attr.Feild, "FieldValue");
 335                 }
 336
 337
 338                 [Test]
 339                 [ExpectedException (typeof (ArgumentException))]
 340                 public void ArgumentExceptionTest_1 ()
 341                 {
 342                         //here the constructor is static
 343
 344                         Type [] ctorParams = new Type [] { };
 345
 346                         ConstructorInfo classCtorInfo =
 347                                 typeof (CustomAttribute).GetConstructor (BindingFlags.Static | BindingFlags.NonPublic,
 348                                                 null, ctorParams, null);
 349
 350                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 351                                 classCtorInfo,
 352                                 new object [] { },
 353                                 new PropertyInfo [] { typeof (CustomAttribute).GetProperty ("AttributeOne") },
 354                                 new object [] { "TestCase" },
 355                                 typeof (CustomAttribute).GetFields (),
 356                                 new object [] { "FieldValue" }
 357                                 );
 358                 }
 359
 360
 361                 [Test]
 362                 [ExpectedException (typeof (ArgumentException))]
 363                 public void ArgumentExceptionTest_2 ()
 364                 {
 365                         //here the consturctor is private
 366
 367                         Type [] ctorParams = new Type[] {typeof(string) };
 368
 369                         ConstructorInfo classCtorInfo =
 370                                 typeof (CustomAttribute).GetConstructor (BindingFlags.Instance |
 371                                                 BindingFlags.NonPublic, null, ctorParams, null);
 372
 373                         Assert ("#Custom Attribute has private constuctor ", classCtorInfo != null);
 374
 375                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 376                                 classCtorInfo,
 377                                 new object [] { "hello" },
 378                                 new PropertyInfo []{ typeof (CustomAttribute).GetProperty ("AttributeOne") },
 379                                 new object [] { "TestCase" },
 380                                 typeof (CustomAttribute).GetFields (),
 381                                 new object [] { "FieldValue" }
 382                                 );
 383                 }
 384
 385
 386                 [Test]
 387                 [ExpectedException (typeof (ArgumentException))]
 388                 public void ArgumentExceptionTest_3 ()
 389                 {
 390                         // The lengths of the namedProperties and
 391                         //propertyValues arrays are different.
 392
 393                         Type [] ctorParams = new Type [] { };
 394
 395                         ConstructorInfo classCtorInfo =
 396                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 397
 398                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 399                                 classCtorInfo,
 400                                 new object [] { },
 401                                 new PropertyInfo [] { typeof (CustomAttribute).GetProperty ("AttributeOne") },
 402                                 new object [] { "TestCase","extra arg" },//<--here is the error
 403                                 typeof (CustomAttribute).GetFields (),
 404                                 new object [] { "FieldValue" }
 405                                 );
 406                 }
 407
 408
 409                 [Test]
 410                 [ExpectedException (typeof (ArgumentException))]
 411                 public void ArgumentExceptionTest_4()
 412                 {
 413                         //The length of the namedFields and
 414                         //namedValues are different
 415
 416                         Type [] ctorParams = new Type [] { };
 417
 418                         ConstructorInfo classCtorInfo =
 419                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 420
 421                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 422                                 classCtorInfo,
 423                                 new object [] { },
 424                                 new PropertyInfo [] { typeof (CustomAttribute).GetProperty ("AttributeOne") },
 425                                 new object [] { "TestCase" },
 426                                 typeof (CustomAttribute).GetFields (),
 427                                 new object [] { }//<--here is the error
 428                                 );
 429                 }
 430
 431
 432                 [Test]
 433                 [ExpectedException (typeof (ArgumentException))]
 434                 public void ArgumentExceptionTest_6 ()
 435                 {
 436                         //The type of supplied argument does not
 437                         //match the type of the parameter declared
 438                         //in the constructor.
 439
 440                         Type [] ctorParams = new Type [] { typeof (string), typeof (string) };
 441
 442                         ConstructorInfo classCtorInfo =
 443                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 444
 445                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 446                                 classCtorInfo,
 447                                 new object [] { "1", 123 },//<--here is the error,(int instead of string)
 448                                 new PropertyInfo[]{ typeof (CustomAttribute).GetProperty ("AttributeOne") },
 449                                 new object [] { "TestCase" },
 450                                 typeof (CustomAttribute).GetFields (),
 451                                 new object [] { "FeildValue" }
 452                                 );
 453                 }
 454
 455
 456                 [Test]
 457                 [ExpectedException (typeof (ArgumentException))]
 458                 public void ArgumentExceptionTest_7 ()
 459                 {
 460                         //A property has no setter.(CustomAttribute.AttributeTwo)
 461
 462                         Type [] ctorParams = new Type [] { typeof (string), typeof (string) };
 463
 464                         ConstructorInfo classCtorInfo =
 465                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 466
 467                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 468                                 classCtorInfo,
 469                                 new object [] { "1","2" },
 470                                 new PropertyInfo []{ typeof (CustomAttribute).GetProperty ("AttributeTwo") },
 471                                 new object [] { "TestCase" },
 472                                 typeof (CustomAttribute).GetFields (),
 473                                 new object [] { "FeildValue" }
 474                                 );
 475                 }
 476
 477
 478                 [Test]
 479                 [ExpectedException (typeof (ArgumentException))]
 480                 public void ArgumentExceptionTest_8 ()
 481                 {
 482                         //A property doesnot belong to same class
 483
 484                         Type [] ctorParams = new Type [] { typeof (string), typeof (string) };
 485
 486                         ConstructorInfo classCtorInfo =
 487                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 488
 489                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 490                                 classCtorInfo,
 491                                 new object [] { "1","2" },
 492                                 new PropertyInfo [] { typeof (TempClass).GetProperty ("FieldProperty")}, //here is the error
 493                                 new object [] { "TestCase" },
 494                                 typeof (CustomAttribute).GetFields (),
 495                                 new object [] { "FeildValue" }
 496                                 );
 497                 }
 498
 499
 500                 [Test]
 501                 [ExpectedException (typeof (ArgumentException))]
 502                 public void ArgumentExceptionTest_9 ()
 503                 {
 504                         //A field doesnot belong to same class
 505
 506                         Type [] ctorParams = new Type [] { typeof (string), typeof (string) };
 507
 508                         ConstructorInfo classCtorInfo =
 509                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 510
 511                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 512                                 classCtorInfo,
 513                                 new object [] { "1","2" },
 514                                 new PropertyInfo []{ typeof (CustomAttribute).GetProperty ("AttributeOne") },
 515                                 new object [] {"TestCase"},
 516                                 typeof (TempClass).GetFields (), //<-- fields of TempClass are passed
 517                                 new object [] { "FeildValue" }
 518                                 );
 519                 }
 520
 521
 522                 [Test]
 523                 [ExpectedException (typeof (ArgumentException))]
 524                 public void ArgumentExceptionTest_10 ()
 525                 {
 526                         //The types of the property values do
 527                         //not match the types of the named properties.
 528
 529
 530                         Type [] ctorParams = new Type [] { typeof (string), typeof (string) };
 531
 532                         ConstructorInfo classCtorInfo =
 533                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 534
 535                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 536                                 classCtorInfo,
 537                                 new object [] { "1","2" },
 538                                 new PropertyInfo []{ typeof (CustomAttribute).GetProperty ("AttributeOne") },
 539                                 new object [] { (long)1212121212 }, //<---type mismatch error(long for string)
 540                                 typeof (CustomAttribute).GetFields (),
 541                                 new object [] { "FeildValue" }
 542                                 );
 543                 }
 544
 545
 546                 [Test]
 547                 [ExpectedException (typeof (ArgumentException))]
 548                 public void ArgumentExceptionTest_11 ()
 549                 {
 550                         //The types of the field values do
 551                         //not match the types of the named properties.
 552
 553                         Type [] ctorParams = new Type [] { typeof (string), typeof (string) };
 554
 555                         ConstructorInfo classCtorInfo =
 556                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 557
 558                         Assert ("#ctor not null", classCtorInfo != null);
 559                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 560                                 classCtorInfo,
 561                                 new object [] { "1","2" },
 562                                 new PropertyInfo [] { typeof (CustomAttribute).GetProperty ("AttributeOne") },
 563                                 new object [] { "One" },
 564                                 typeof (CustomAttribute).GetFields (),
 565                                 new object []{ 12.1212 } //<---type mismatch error(double for string)
 566                                 );
 567                 }
 568
 569
 570                 [Test]
 571                 [ExpectedException (typeof (ArgumentNullException))]
 572                 public void ArgumentNullException_1 ()
 573                 {
 574                         //the ctor value array (2nd argument) is null
 575                         Type [] ctorParams = new Type [] { typeof (string),typeof (string) };
 576
 577                         ConstructorInfo classCtorInfo =
 578                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 579
 580                         Assert ("#ctor not null", classCtorInfo != null);
 581                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 582                                 classCtorInfo,
 583                                 null, //<-- here is the error
 584                                 new PropertyInfo [] { typeof (CustomAttribute).GetProperty ("AttributeOne") },
 585                                 new object [] { "One" },
 586                                 typeof (CustomAttribute).GetFields (),
 587                                 new object [] { "feild" }
 588                                 );
 589                 }
 590
 591
 592                 [Test]
 593                 [ExpectedException (typeof (ArgumentNullException))]
 594                 public void ArgumentNullException_2 ()
 595                 {
 596                         //the property value array (4th argument) is null
 597                         Type [] ctorParams = new Type [] { typeof (string), typeof (string) };
 598
 599                         ConstructorInfo classCtorInfo =
 600                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 601
 602                         Assert ("#ctor not null", classCtorInfo != null);
 603                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 604                                 classCtorInfo,
 605                                 new object [] { "one","two" },
 606                                 new PropertyInfo []{ typeof (CustomAttribute).GetProperty ("AttributeOne") },
 607                                 null, // <-- here is the error
 608                                 typeof (CustomAttribute).GetFields (),
 609                                 new object [] { "feild" }
 610                                 );
 611                 }
 612
 613
 614                 [Test]
 615                 [ExpectedException (typeof (ArgumentNullException))]
 616                 public void ArgumentNullException_3 ()
 617                 {
 618                         //the field value array (6th argument) is null
 619                         Type [] ctorParams = new Type [] { typeof (string), typeof (string) };
 620
 621                         ConstructorInfo classCtorInfo =
 622                                 typeof (CustomAttribute).GetConstructor (ctorParams);
 623
 624                         Assert ("#ctor not null", classCtorInfo != null);
 625                         CustomAttributeBuilder typeCABuilder = new CustomAttributeBuilder (
 626                                 classCtorInfo,
 627                                 new object [] { "one","two" },
 628                                 new PropertyInfo [] { typeof (CustomAttribute).GetProperty ("AttributeOne") },
 629                                 new object [] {"property"},
 630                                 typeof (CustomAttribute).GetFields (),
 631                                 null // <-- here is the error
 632                                 );
 633                 }
 634         }
 635 }
 636