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                 [ExpectedException (typeof (ArgumentNullException))]
  91                 public void ArgInstanceNullForNonStaticMethod ()
  92                 {
  93                         Expression.Call (null, typeof (object).GetMethod ("ToString"));
  94                 }
  95
  96                 [Test]
  97                 [ExpectedException (typeof (ArgumentException))]
  98                 public void InstanceTypeDoesntMatchMethodDeclaringType ()
  99                 {
 100                         Expression.Call (Expression.Constant (1), typeof (string).GetMethod ("Intern"));
 101                 }
 102
 103                 [Test]
 104                 [ExpectedException (typeof (ArgumentException))]
 105                 public void MethodArgumentCountDoesnMatchParameterLength ()
 106                 {
 107                         Expression.Call (Expression.Constant (new object ()), typeof (object).GetMethod ("ToString"), Expression.Constant (new object ()));
 108                 }
 109
 110                 public class Foo {
 111                         public void Bar (string s)
 112                         {
 113                         }
 114                 }
 115
 116                 [Test]
 117                 [ExpectedException (typeof (ArgumentNullException))]
 118                 public void MethodHasNullArgument ()
 119                 {
 120                         Expression.Call (Expression.New (typeof (Foo)), typeof (Foo).GetMethod ("Bar"), null as Expression);
 121                 }
 122
 123                 [Test]
 124                 [ExpectedException (typeof (ArgumentException))]
 125                 public void MethodArgumentDoesntMatchParameterType ()
 126                 {
 127                         Expression.Call (Expression.New (typeof (Foo)), typeof (Foo).GetMethod ("Bar"), Expression.Constant (42));
 128                 }
 129
 130                 [Test]
 131                 public void CallToString ()
 132                 {
 133                         var call = Expression.Call (Expression.Constant (new object ()), typeof (object).GetMethod ("ToString"));
 134                         Assert.AreEqual ("value(System.Object).ToString()", call.ToString ());
 135                 }
 136
 137                 [Test]
 138                 public void CallStringIsNullOrEmpty ()
 139                 {
 140                         var call = Expression.Call (null, typeof (string).GetMethod ("IsNullOrEmpty"), Expression.Constant (""));
 141                         Assert.AreEqual ("IsNullOrEmpty(\"\")", call.ToString ());
 142                 }
 143
 144                 public static object Identity (object o)
 145                 {
 146                         return o;
 147                 }
 148
 149                 [Test]
 150                 public void CompileSimpleStaticCall ()
 151                 {
 152                         var p = Expression.Parameter (typeof (object), "o");
 153                         var lambda = Expression.Lambda<Func<object, object>> (Expression.Call (GetType ().GetMethod ("Identity"), p), p);
 154
 155                         var i = lambda.Compile ();
 156
 157                         Assert.AreEqual (2, i (2));
 158                         Assert.AreEqual ("Foo", i ("Foo"));
 159                 }
 160
 161                 [Test]
 162                 public void CompileSimpleInstanceCall ()
 163                 {
 164                         var p = Expression.Parameter (typeof (string), "p");
 165                         var lambda = Expression.Lambda<Func<string, string>> (
 166                                 Expression.Call (
 167                                         p, typeof (string).GetMethod ("ToString", Type.EmptyTypes)),
 168                                 p);
 169
 170                         var ts = lambda.Compile ();
 171
 172                         Assert.AreEqual ("foo", ts ("foo"));
 173                         Assert.AreEqual ("bar", ts ("bar"));
 174                 }
 175
 176                 [Test]
 177                 [ExpectedException (typeof (InvalidOperationException))]
 178                 public void CheckTypeArgsIsNotUsedForParameterLookup ()
 179                 {
 180                         Expression.Call (GetType (), "EineMethod", new [] { typeof (string), typeof (int) }, "foo".ToConstant (), 2.ToConstant ());
 181                 }
 182
 183                 public static void EineGenericMethod<X, Y> (string foo, int bar)
 184                 {
 185                 }
 186
 187                 [Test]
 188                 public void CheckTypeArgsIsUsedForGenericArguments ()
 189                 {
 190                         var m = Expression.Call (GetType (), "EineGenericMethod", new [] { typeof (string), typeof (int) }, "foo".ToConstant (), 2.ToConstant ());
 191                         Assert.IsNotNull (m.Method);
 192                         Assert.AreEqual ("Void EineGenericMethod[String,Int32](System.String, Int32)", m.Method.ToString ());
 193                 }
 194
 195                 public struct EineStrukt {
 196
 197                         public string Foo;
 198
 199                         public EineStrukt (string foo)
 200                         {
 201                                 Foo = foo;
 202                         }
 203
 204                         public string GimmeFoo ()
 205                         {
 206                                 return Foo;
 207                         }
 208                 }
 209
 210                 [Test]
 211                 public void CallMethodOnStruct ()
 212                 {
 213                         var param = Expression.Parameter (typeof (EineStrukt), "s");
 214                         var foo = Expression.Lambda<Func<EineStrukt, string>> (
 215                                 Expression.Call (param, typeof (EineStrukt).GetMethod ("GimmeFoo")), param).Compile ();
 216
 217                         var s = new EineStrukt ("foo");
 218                         Assert.AreEqual ("foo", foo (s));
 219                 }
 220
 221                 public static int OneStaticMethod ()
 222                 {
 223                         return 42;
 224                 }
 225
 226                 [Test]
 227                 public void CallStaticMethodOnNonSenseInstanceExpression ()
 228                 {
 229                         var call = Expression.Call (
 230                                         Expression.Constant ("la la la"),
 231                                         this.GetType ().GetMethod ("OneStaticMethod"));
 232
 233                         Assert.IsNotNull (call.Object);
 234
 235                         var callMethod = Expression.Lambda<Func<int>> (call).Compile ();
 236
 237                         Assert.AreEqual (42, callMethod ());
 238                 }
 239
 240                 public static int DoSomethingWith (ref int a)
 241                 {
 242                         return a + 4;
 243                 }
 244
 245                 [Test]
 246                 public void CallStaticMethodWithRefParameter ()
 247                 {
 248                         var p = Expression.Parameter (typeof (int), "i");
 249
 250                         var c = Expression.Lambda<Func<int, int>> (
 251                                 Expression.Call (GetType ().GetMethod ("DoSomethingWith"), p), p).Compile ();
 252
 253                         Assert.AreEqual (42, c (38));
 254                 }
 255
 256                 public static int Bang (Expression i)
 257                 {
 258                         return (int) (i as ConstantExpression).Value;
 259                 }
 260
 261                 [Test]
 262                 [Category ("NotWorking")]
 263                 public void CallMethodWithExpressionParameter ()
 264                 {
 265                         var call = Expression.Call (GetType ().GetMethod ("Bang"), Expression.Constant (42));
 266                         Assert.AreEqual (ExpressionType.Quote, call.Arguments [0].NodeType);
 267
 268                         var l = Expression.Lambda<Func<int>> (call).Compile ();
 269
 270                         Assert.AreEqual (42, l ());
 271                 }
 272         }
 273 }