mcs/nunit20/core/Reflect.cs

   1 using System;
   2 using System.Reflection;
   3 using System.Collections;
   4 using NUnit.Framework;
   5
   6 namespace NUnit.Core
   7 {
   8         /// <summary>
   9         /// Helper methods for inspecting a type by reflection.
  10         ///
  11         /// Many of these methods take a MemberInfo as an argument to avoid
  12         /// duplication, even though certain attributes can only appear on
  13         /// specific types of members, like MethodInfo or Type.
  14         ///
  15         /// Generally, these methods perform simple utility functions like
  16         /// checking for a given attribute. However, some of the methdods
  17         /// actually implement policies, which might change at some later
  18         /// time. The intent is that policies that may vary among different
  19         /// types of test cases or suites should be handled by those types,
  20         /// while common decisions are handled here.
  21         /// </summary>
  22         public class Reflect
  23         {
  24                 #region Attribute types used by reflect
  25
  26                 public static readonly Type TestFixtureType = typeof( TestFixtureAttribute );
  27                 public static readonly Type TestType = typeof( TestAttribute );
  28                 public static readonly Type SetUpType = typeof( SetUpAttribute );
  29                 public static readonly Type TearDownType = typeof( TearDownAttribute );
  30                 public static readonly Type FixtureSetUpType = typeof( TestFixtureSetUpAttribute );
  31                 public static readonly Type FixtureTearDownType = typeof( TestFixtureTearDownAttribute );
  32                 public static readonly Type ExplicitType = typeof( ExplicitAttribute );
  33                 public static readonly Type CategoryType = typeof( CategoryAttribute );
  34                 public static readonly Type IgnoreType = typeof( IgnoreAttribute );
  35                 public static readonly Type ExpectedExceptionType = typeof( ExpectedExceptionAttribute );
  36                 public static readonly Type SuiteType = typeof( SuiteAttribute );
  37
  38                 #endregion
  39
  40                 #region Binding flags used by reflect
  41
  42                 private static readonly BindingFlags InstanceMethods =
  43                         BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance;
  44
  45                 private static readonly BindingFlags StaticMethods =
  46                         BindingFlags.Static | BindingFlags.Public | BindingFlags.DeclaredOnly;
  47
  48                 private static readonly BindingFlags AllMethods =
  49                         BindingFlags.Public |  BindingFlags.NonPublic |
  50                         BindingFlags.Instance | BindingFlags.Static;
  51
  52                 private static readonly BindingFlags AllDeclaredMethods =
  53                         AllMethods | BindingFlags.DeclaredOnly;
  54
  55                 #endregion
  56
  57                 #region Check for presence of an attribute
  58
  59                 public static bool HasTestFixtureAttribute(Type type)
  60                 {
  61                         return type.IsDefined( TestFixtureType, true ); // Inheritable
  62                 }
  63
  64                 public static bool HasTestAttribute(MethodInfo method)
  65                 {
  66                         return method.IsDefined( TestType, false );
  67                 }
  68
  69                 public static bool HasExplicitAttribute(MemberInfo member)
  70                 {
  71                         return member.IsDefined( ExplicitType, false );
  72                 }
  73
  74                 public static bool HasCategoryAttribute(MemberInfo member)
  75                 {
  76                         return member.IsDefined( CategoryType, false );
  77                 }
  78
  79                 public static bool HasExpectedExceptionAttribute(MethodInfo method)
  80                 {
  81                         return method.IsDefined( ExpectedExceptionType, false );
  82                 }
  83
  84                 public static bool HasIgnoreAttribute( MemberInfo member )
  85                 {
  86                         return member.IsDefined( IgnoreType, false );
  87                 }
  88
  89                 public static bool HasSuiteAttribute( PropertyInfo property )
  90                 {
  91                         return property.IsDefined( SuiteType, false );
  92                 }
  93
  94                 #endregion
  95
  96                 #region Legacy Checks on Names
  97
  98                 public static bool IsObsoleteTestMethod(MethodInfo methodToCheck)
  99                 {
 100                         if ( methodToCheck.Name.ToLower().StartsWith("test") )
 101                         {
 102                                 object[] attributes = methodToCheck.GetCustomAttributes( false );
 103
 104                                 foreach( Attribute attribute in attributes )
 105                                         if( attribute is SetUpAttribute ||
 106                                                 attribute is TestFixtureSetUpAttribute ||
 107                                                 attribute is TearDownAttribute ||
 108                                                 attribute is TestFixtureTearDownAttribute )
 109                                         {
 110                                                 return false;
 111                                         }
 112
 113                                 return true;
 114                         }
 115
 116                         return false;
 117                 }
 118
 119                 #endregion
 120
 121                 #region Get Attributes
 122
 123                 public static TestFixtureAttribute GetTestFixtureAttribute( Type type )
 124                 {
 125                         object[] attributes = type.GetCustomAttributes( TestFixtureType, true );
 126                         return attributes.Length > 0 ? (TestFixtureAttribute) attributes[0] : null;
 127                 }
 128
 129                 public static TestAttribute GetTestAttribute( MemberInfo member )
 130                 {
 131                         object[] attributes = member.GetCustomAttributes( TestType, false );
 132                         return attributes.Length > 0 ? (TestAttribute)attributes[0] : null;
 133                 }
 134
 135                 public static IgnoreAttribute GetIgnoreAttribute( MemberInfo member )
 136                 {
 137                         object[] attributes = member.GetCustomAttributes( IgnoreType, false );
 138                         return attributes.Length > 0 ? (IgnoreAttribute) attributes[0] : null;
 139                 }
 140
 141                 public static ExpectedExceptionAttribute GetExpectedExceptionAttribute( MethodInfo method )
 142                 {
 143                         object[] attributes = method.GetCustomAttributes( ExpectedExceptionType, false);
 144                         return attributes.Length > 0 ? (ExpectedExceptionAttribute) attributes[0] : null;
 145                 }
 146
 147                 #endregion
 148
 149                 #region Get Properties of Attributes
 150
 151                 public static string GetIgnoreReason( MemberInfo member )
 152                 {
 153                         IgnoreAttribute attribute = GetIgnoreAttribute( member );
 154                         return attribute == null ? "no reason" : attribute.Reason;
 155                 }
 156
 157                 public static string GetDescription( MethodInfo method )
 158                 {
 159                         TestAttribute attribute = GetTestAttribute( method );
 160                         return attribute == null ? null : attribute.Description;
 161                 }
 162
 163                 public static string GetDescription( Type fixtureType )
 164                 {
 165                         TestFixtureAttribute attribute = GetTestFixtureAttribute( fixtureType );
 166                         return attribute == null ? null : attribute.Description;
 167                 }
 168
 169                 #endregion
 170
 171                 #region Methods to check validity of a type and its members
 172
 173                 /// <summary>
 174                 /// Method to validate that a type is a valid test fixture
 175                 /// </summary>
 176                 /// <param name="fixtureType">The type to be checked</param>
 177                 public static void CheckFixtureType( Type fixtureType )
 178                 {
 179                         if ( fixtureType.GetConstructor( Type.EmptyTypes ) == null )
 180                                 throw new InvalidTestFixtureException(fixtureType.FullName + " does not have a valid constructor");
 181
 182                         CheckSetUpTearDownMethod( fixtureType, SetUpType );
 183                         CheckSetUpTearDownMethod( fixtureType, TearDownType );
 184                         CheckSetUpTearDownMethod( fixtureType, FixtureSetUpType );
 185                         CheckSetUpTearDownMethod( fixtureType, FixtureTearDownType );
 186                 }
 187
 188                 /// <summary>
 189                 /// This method verifies that a type has no more than one method of a particular
 190                 /// SetUp or TearDown type and that the method has a correct signature.
 191                 /// </summary>
 192                 /// <param name="fixtureType">The type to be checked</param>
 193                 /// <param name="attributeType">The attribute to check for</param>
 194                 private static void CheckSetUpTearDownMethod( Type fixtureType, Type attributeType )
 195                 {
 196                         int count = 0;
 197                         MethodInfo theMethod = null;
 198
 199                         foreach(MethodInfo method in fixtureType.GetMethods( AllDeclaredMethods ))
 200                         {
 201                                 if( method.IsDefined( attributeType, false ) )
 202                                 {
 203                                         theMethod = method;
 204                                         count++;
 205                                 }
 206                         }
 207
 208                         if ( count > 1 )
 209                         {
 210                                 string attributeName = attributeType.Name;
 211                                 if ( attributeName.EndsWith( "Attribute" ) )
 212                                         attributeName = attributeName.Substring(
 213                                                 0, attributeName.Length - 9 );
 214
 215                                 throw new InvalidTestFixtureException(
 216                                         string.Format( "{0} has multiple {1} methods",
 217                                         fixtureType.Name, attributeName ) );
 218                         }
 219
 220                         CheckSetUpTearDownSignature( theMethod );
 221                 }
 222
 223                 private static void CheckSetUpTearDownSignature( MethodInfo method )
 224                 {
 225                         if ( method != null )
 226                         {
 227                                 if ( !method.IsPublic && !method.IsFamily || method.IsStatic || method.ReturnType != typeof(void) || method.GetParameters().Length > 0 )
 228                                         throw new InvalidTestFixtureException("Invalid SetUp or TearDown method signature");
 229                         }
 230                 }
 231
 232                 /// <summary>
 233                 /// Check the signature of a test method
 234                 /// </summary>
 235                 /// <param name="methodToCheck">The method signature to check</param>
 236                 /// <returns>True if the signature is correct, otherwise false</returns>
 237                 public static bool IsTestMethodSignatureCorrect(MethodInfo methodToCheck)
 238                 {
 239                         return
 240                                 !methodToCheck.IsStatic
 241                                 && !methodToCheck.IsAbstract
 242                                 && methodToCheck.IsPublic
 243                                 && methodToCheck.GetParameters().Length == 0
 244                                 && methodToCheck.ReturnType.Equals(typeof(void));
 245                 }
 246
 247                 #endregion
 248
 249                 #region Get Methods of a type
 250
 251                 // These methods all take an object and assume that the type of the
 252                 // object was pre-checked so that there are no duplicate methods,
 253                 // statics, private methods, etc.
 254
 255                 public static ConstructorInfo GetConstructor( Type fixtureType )
 256                 {
 257                         return fixtureType.GetConstructor( Type.EmptyTypes );
 258                 }
 259
 260                 public static MethodInfo GetSetUpMethod( Type fixtureType )
 261                 {
 262                         return GetMethod( fixtureType, SetUpType );
 263                 }
 264
 265                 public static MethodInfo GetTearDownMethod(Type fixtureType)
 266                 {
 267                         return GetMethod(fixtureType, TearDownType );
 268                 }
 269
 270                 public static MethodInfo GetFixtureSetUpMethod( Type fixtureType )
 271                 {
 272                         return GetMethod( fixtureType, FixtureSetUpType );
 273                 }
 274
 275                 public static MethodInfo GetFixtureTearDownMethod( Type fixtureType )
 276                 {
 277                         return GetMethod( fixtureType, FixtureTearDownType );
 278                 }
 279
 280                 public static MethodInfo GetMethod( Type fixtureType, Type attributeType )
 281                 {
 282                         foreach(MethodInfo method in fixtureType.GetMethods( InstanceMethods ) )
 283                         {
 284                                 if( method.IsDefined( attributeType, true ) )
 285                                         return method;
 286                         }
 287
 288                         return null;
 289                 }
 290
 291                 public static MethodInfo GetMethod( Type fixtureType, string methodName )
 292                 {
 293                         foreach(MethodInfo method in fixtureType.GetMethods( InstanceMethods ) )
 294                         {
 295                                 if( method.Name == methodName )
 296                                         return method;
 297                         }
 298
 299                         return null;
 300                 }
 301
 302                 #endregion
 303
 304                 #region Get Suite Property
 305
 306                 public static PropertyInfo GetSuiteProperty( Type testClass )
 307                 {
 308                         if( testClass != null )
 309                         {
 310                                 PropertyInfo[] properties = testClass.GetProperties( StaticMethods );
 311                                 foreach( PropertyInfo property in properties )
 312                                 {
 313                                         if( Reflect.HasSuiteAttribute( property ) )
 314                                         {
 315                                                 try
 316                                                 {
 317                                                         CheckSuiteProperty(property);
 318                                                 }
 319                                                 catch( InvalidSuiteException )
 320                                                 {
 321                                                         return null;
 322                                                 }
 323                                                 return property;
 324                                         }
 325                                 }
 326                         }
 327                         return null;
 328                 }
 329
 330                 private static void CheckSuiteProperty(PropertyInfo property)
 331                 {
 332                         MethodInfo method = property.GetGetMethod(true);
 333                         if(method.ReturnType!=typeof(NUnit.Core.TestSuite))
 334                                 throw new InvalidSuiteException("Invalid suite property method signature");
 335                         if(method.GetParameters().Length>0)
 336                                 throw new InvalidSuiteException("Invalid suite property method signature");
 337                 }
 338
 339                 #endregion
 340
 341                 #region Categories
 342
 343                 public static IList GetCategories( MemberInfo member )
 344                 {
 345                         object[] attributes = member.GetCustomAttributes( CategoryType, false );
 346                         IList names = new ArrayList();
 347
 348                         foreach(CategoryAttribute attribute in attributes)
 349                                 names.Add(attribute.Name);
 350
 351                         return names;
 352                 }
 353
 354                 #endregion
 355
 356                 #region Invoke Methods
 357
 358                 public static object Construct( Type type )
 359                 {
 360                         ConstructorInfo ctor = GetConstructor( type );
 361                         if ( ctor == null )
 362                                 throw new InvalidTestFixtureException(type.FullName + " does not have a valid constructor");
 363
 364                         return ctor.Invoke( Type.EmptyTypes );
 365                 }
 366
 367                 public static void InvokeMethod( MethodInfo method, object fixture )
 368                 {
 369                         if(method != null)
 370                         {
 371                                 try
 372                                 {
 373                                         method.Invoke( fixture, null );
 374                                 }
 375                                 catch(TargetInvocationException e)
 376                                 {
 377                                         Exception inner = e.InnerException;
 378                                         throw new NunitException("Rethrown",inner);
 379                                 }
 380                         }
 381                 }
 382
 383                 public static void InvokeSetUp( object fixture )
 384                 {
 385                         MethodInfo method = GetSetUpMethod( fixture.GetType() );
 386                         if(method != null)
 387                         {
 388                                 InvokeMethod(method, fixture);
 389                         }
 390                 }
 391
 392                 public static void InvokeTearDown( object fixture )
 393                 {
 394                         MethodInfo method = GetTearDownMethod( fixture.GetType() );
 395                         if(method != null)
 396                         {
 397                                 InvokeMethod(method, fixture);
 398                         }
 399                 }
 400
 401                 #endregion
 402
 403                 #region Private Constructor for static-only class
 404
 405                 private Reflect() { }
 406
 407                 #endregion
 408         }
 409 }