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

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   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 //
  19 // Authors:
  20 //              Federico Di Gregorio <fog@initd.org>
  21 //              Jb Evain <jbevain@novell.com>
  22
  23 using System;
  24 using System.Reflection;
  25 using System.Linq;
  26 using System.Linq.Expressions;
  27 using NUnit.Framework;
  28
  29 namespace MonoTests.System.Linq.Expressions
  30 {
  31         [TestFixture]
  32         public class ExpressionTest_AndAlso
  33         {
  34                 [Test]
  35                 [ExpectedException (typeof (ArgumentNullException))]
  36                 public void Arg1Null ()
  37                 {
  38                         Expression.AndAlso (null, Expression.Constant (1));
  39                 }
  40
  41                 [Test]
  42                 [ExpectedException (typeof (ArgumentNullException))]
  43                 public void Arg2Null ()
  44                 {
  45                         Expression.AndAlso (Expression.Constant (1), null);
  46                 }
  47
  48                 [Test]
  49                 [ExpectedException (typeof (InvalidOperationException))]
  50                 public void NoOperatorClass ()
  51                 {
  52                         Expression.AndAlso (Expression.Constant (new NoOpClass ()), Expression.Constant (new NoOpClass ()));
  53                 }
  54
  55                 [Test]
  56                 [ExpectedException (typeof (InvalidOperationException))]
  57                 public void Double ()
  58                 {
  59                         Expression.AndAlso (Expression.Constant (1.0), Expression.Constant (2.0));
  60                 }
  61
  62                 [Test]
  63                 [ExpectedException (typeof (InvalidOperationException))]
  64                 public void Integer ()
  65                 {
  66                         Expression.AndAlso (Expression.Constant (1), Expression.Constant (2));
  67                 }
  68
  69                 [Test]
  70                 [ExpectedException (typeof (InvalidOperationException))]
  71                 public void MismatchedTypes ()
  72                 {
  73                         Expression.AndAlso (Expression.Constant (new OpClass ()), Expression.Constant (true));
  74                 }
  75
  76                 [Test]
  77                 public void Boolean ()
  78                 {
  79                         BinaryExpression expr = Expression.AndAlso (Expression.Constant (true), Expression.Constant (false));
  80                         Assert.AreEqual (ExpressionType.AndAlso, expr.NodeType, "AndAlso#01");
  81                         Assert.AreEqual (typeof (bool), expr.Type, "AndAlso#02");
  82                         Assert.IsNull (expr.Method, "AndAlso#03");
  83 #if !NET_4_0
  84                         Assert.AreEqual ("(True && False)", expr.ToString(), "AndAlso#04");
  85 #endif
  86                 }
  87
  88                 [Test]
  89                 public void UserDefinedClass ()
  90                 {
  91                         // We can use the simplest version of GetMethod because we already know only one
  92                         // exists in the very simple class we're using for the tests.
  93                         MethodInfo mi = typeof (OpClass).GetMethod ("op_BitwiseAnd");
  94
  95                         BinaryExpression expr = Expression.AndAlso (Expression.Constant (new OpClass ()), Expression.Constant (new OpClass ()));
  96                         Assert.AreEqual (ExpressionType.AndAlso, expr.NodeType, "AndAlso#05");
  97                         Assert.AreEqual (typeof (OpClass), expr.Type, "AndAlso#06");
  98                         Assert.AreEqual (mi, expr.Method, "AndAlso#07");
  99                         Assert.AreEqual ("op_BitwiseAnd", expr.Method.Name, "AndAlso#08");
 100 #if !NET_4_0
 101                         Assert.AreEqual ("(value(MonoTests.System.Linq.Expressions.OpClass) && value(MonoTests.System.Linq.Expressions.OpClass))",
 102                                 expr.ToString(), "AndAlso#09");
 103 #endif
 104                 }
 105
 106                 [Test]
 107                 public void AndAlsoTest ()
 108                 {
 109                         var a = Expression.Parameter (typeof (bool), "a");
 110                         var b = Expression.Parameter (typeof (bool), "b");
 111                         var l = Expression.Lambda<Func<bool, bool, bool>> (
 112                                 Expression.AndAlso (a, b), a, b);
 113
 114                         var be = l.Body as BinaryExpression;
 115                         Assert.IsNotNull (be);
 116                         Assert.AreEqual (typeof (bool), be.Type);
 117                         Assert.IsFalse (be.IsLifted);
 118                         Assert.IsFalse (be.IsLiftedToNull);
 119
 120                         var c = l.Compile ();
 121
 122                         Assert.AreEqual (true,  c (true, true), "a1");
 123                         Assert.AreEqual (false, c (true, false), "a2");
 124                         Assert.AreEqual (false, c (false, true), "a3");
 125                         Assert.AreEqual (false, c (false, false), "a4");
 126                 }
 127
 128                 [Test]
 129                 public void AndAlsoLifted ()
 130                 {
 131                         var b = Expression.AndAlso (
 132                                 Expression.Constant (null, typeof (bool?)),
 133                                 Expression.Constant (null, typeof (bool?)));
 134
 135                         Assert.AreEqual (typeof (bool?), b.Type);
 136                         Assert.IsTrue (b.IsLifted);
 137                         Assert.IsTrue (b.IsLiftedToNull);
 138                 }
 139
 140                 [Test]
 141                 public void AndAlsoNotLifted ()
 142                 {
 143                         var b = Expression.AndAlso (
 144                                 Expression.Constant (true, typeof (bool)),
 145                                 Expression.Constant (true, typeof (bool)));
 146
 147                         Assert.AreEqual (typeof (bool), b.Type);
 148                         Assert.IsFalse (b.IsLifted);
 149                         Assert.IsFalse (b.IsLiftedToNull);
 150                 }
 151
 152                 [Test]
 153                 public void AndAlsoTestNullable ()
 154                 {
 155                         var a = Expression.Parameter (typeof (bool?), "a");
 156                         var b = Expression.Parameter (typeof (bool?), "b");
 157                         var l = Expression.Lambda<Func<bool?, bool?, bool?>> (
 158                                 Expression.AndAlso (a, b), a, b);
 159
 160                         var be = l.Body as BinaryExpression;
 161                         Assert.IsNotNull (be);
 162                         Assert.AreEqual (typeof (bool?), be.Type);
 163                         Assert.IsTrue (be.IsLifted);
 164                         Assert.IsTrue (be.IsLiftedToNull);
 165
 166                         var c = l.Compile ();
 167
 168                         Assert.AreEqual (true,  c (true, true), "a1");
 169                         Assert.AreEqual (false, c (true, false), "a2");
 170                         Assert.AreEqual (false, c (false, true), "a3");
 171                         Assert.AreEqual (false, c (false, false), "a4");
 172
 173                         Assert.AreEqual (null,  c (true, null), "a5");
 174                         Assert.AreEqual (false, c (false, null), "a6");
 175                         Assert.AreEqual (false, c (null, false), "a7");
 176                         Assert.AreEqual (null,  c (true, null), "a8");
 177                         Assert.AreEqual (null,  c (null, null), "a9");
 178                 }
 179
 180                 [Test]
 181                 public void AndAlsoBoolItem ()
 182                 {
 183                         var i = Expression.Parameter (typeof (Item<bool>), "i");
 184                         var and = Expression.Lambda<Func<Item<bool>, bool>> (
 185                                 Expression.AndAlso (
 186                                         Expression.Property (i, "Left"),
 187                                         Expression.Property (i, "Right")), i).Compile ();
 188
 189                         var item = new Item<bool> (false, true);
 190                         Assert.AreEqual (false, and (item));
 191                         Assert.IsTrue (item.LeftCalled);
 192                         Assert.IsFalse (item.RightCalled);
 193                 }
 194
 195                 [Test]
 196                 public void AndAlsoNullableBoolItem ()
 197                 {
 198                         var i = Expression.Parameter (typeof (Item<bool?>), "i");
 199                         var and = Expression.Lambda<Func<Item<bool?>, bool?>> (
 200                                 Expression.AndAlso (
 201                                         Expression.Property (i, "Left"),
 202                                         Expression.Property (i, "Right")), i).Compile ();
 203
 204                         var item = new Item<bool?> (false, true);
 205                         Assert.AreEqual ((bool?) false, and (item));
 206                         Assert.IsTrue (item.LeftCalled);
 207                         Assert.IsFalse (item.RightCalled);
 208                 }
 209
 210                 struct Slot {
 211
 212                         public int Value;
 213
 214                         public Slot (int val)
 215                         {
 216                                 this.Value = val;
 217                         }
 218
 219                         public static Slot operator & (Slot a, Slot b)
 220                         {
 221                                 return new Slot (a.Value & b.Value);
 222                         }
 223
 224                         public static bool operator true (Slot a)
 225                         {
 226                                 return a.Value != 0;
 227                         }
 228
 229                         public static bool operator false (Slot a)
 230                         {
 231                                 return a.Value == 0;
 232                         }
 233
 234                         public override string ToString ()
 235                         {
 236                                 return Value.ToString ();
 237                         }
 238                 }
 239
 240                 [Test]
 241                 public void UserDefinedAndAlso ()
 242                 {
 243                         var l = Expression.Parameter (typeof (Slot), "l");
 244                         var r = Expression.Parameter (typeof (Slot), "r");
 245
 246                         var method = typeof (Slot).GetMethod ("op_BitwiseAnd");
 247
 248                         var node = Expression.AndAlso (l, r, method);
 249                         Assert.IsFalse (node.IsLifted);
 250                         Assert.IsFalse (node.IsLiftedToNull);
 251                         Assert.AreEqual (method, node.Method);
 252
 253                         var andalso = Expression.Lambda<Func<Slot, Slot, Slot>> (node, l, r).Compile ();
 254
 255                         Assert.AreEqual (new Slot (64), andalso (new Slot (64), new Slot (64)));
 256                         Assert.AreEqual (new Slot (0), andalso (new Slot (32), new Slot (64)));
 257                         Assert.AreEqual (new Slot (0), andalso (new Slot (64), new Slot (32)));
 258                 }
 259
 260                 [Test]
 261                 public void UserDefinedAndAlsoShortCircuit ()
 262                 {
 263                         var i = Expression.Parameter (typeof (Item<Slot>), "i");
 264                         var and = Expression.Lambda<Func<Item<Slot>, Slot>> (
 265                                 Expression.AndAlso (
 266                                         Expression.Property (i, "Left"),
 267                                         Expression.Property (i, "Right")), i).Compile ();
 268
 269                         var item = new Item<Slot> (new Slot (0), new Slot (1));
 270                         Assert.AreEqual (new Slot (0), and (item));
 271                         Assert.IsTrue (item.LeftCalled);
 272                         Assert.IsFalse (item.RightCalled);
 273                 }
 274
 275                 [Test]
 276                 [Category ("NotDotNet")] // https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=350228
 277                 public void UserDefinedLiftedAndAlsoShortCircuit ()
 278                 {
 279                         var i = Expression.Parameter (typeof (Item<Slot?>), "i");
 280                         var and = Expression.Lambda<Func<Item<Slot?>, Slot?>> (
 281                                 Expression.AndAlso (
 282                                         Expression.Property (i, "Left"),
 283                                         Expression.Property (i, "Right")), i).Compile ();
 284
 285                         var item = new Item<Slot?> (null, new Slot (1));
 286                         Assert.AreEqual ((Slot?) null, and (item));
 287                         Assert.IsTrue (item.LeftCalled);
 288                         Assert.IsFalse (item.RightCalled);
 289                 }
 290
 291                 [Test]
 292                 public void UserDefinedAndAlsoLiftedToNull ()
 293                 {
 294                         var l = Expression.Parameter (typeof (Slot?), "l");
 295                         var r = Expression.Parameter (typeof (Slot?), "r");
 296
 297                         var method = typeof (Slot).GetMethod ("op_BitwiseAnd");
 298
 299                         var node = Expression.AndAlso (l, r, method);
 300                         Assert.IsTrue (node.IsLifted);
 301                         Assert.IsTrue (node.IsLiftedToNull);
 302                         Assert.AreEqual (method, node.Method);
 303
 304                         var andalso = Expression.Lambda<Func<Slot?, Slot?, Slot?>> (node, l, r).Compile ();
 305
 306                         Assert.AreEqual (new Slot (64), andalso (new Slot (64), new Slot (64)));
 307                         Assert.AreEqual (new Slot (0), andalso (new Slot (32), new Slot (64)));
 308                         Assert.AreEqual (new Slot (0), andalso (new Slot (64), new Slot (32)));
 309                         Assert.AreEqual (null, andalso (null, new Slot (32)));
 310                         Assert.AreEqual (null, andalso (new Slot (64), null));
 311                         Assert.AreEqual (null, andalso (null, null));
 312                 }
 313
 314                 struct Incomplete {
 315                         public int Value;
 316
 317                         public Incomplete (int val)
 318                         {
 319                                 Value = val;
 320                         }
 321
 322                         public static Incomplete operator & (Incomplete a, Incomplete b)
 323                         {
 324                                 return new Incomplete (a.Value & b.Value);
 325                         }
 326                 }
 327
 328                 [Test]
 329                 [ExpectedException (typeof (ArgumentException))]
 330                 public void IncompleteUserDefinedAndAlso ()
 331                 {
 332                         var l = Expression.Parameter (typeof (Incomplete), "l");
 333                         var r = Expression.Parameter (typeof (Incomplete), "r");
 334
 335                         var method = typeof (Incomplete).GetMethod ("op_BitwiseAnd");
 336
 337                         Expression.AndAlso (l, r, method);
 338                 }
 339
 340                 class A {
 341                         public static bool operator true (A x)
 342                         {
 343                                 return true;
 344                         }
 345
 346                         public static bool operator false (A x)
 347                         {
 348                                 return false;
 349                         }
 350                 }
 351
 352                 class B : A {
 353                         public static B operator & (B x, B y)
 354                         {
 355                                 return new B ();
 356                         }
 357
 358                         public static bool op_True<T> (B x)
 359                         {
 360                                 return true;
 361                         }
 362
 363                         public static bool op_False (B x)
 364                         {
 365                                 return false;
 366                         }
 367                 }
 368
 369                 [Test] // from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=350487
 370                 public void Connect350487 ()
 371                 {
 372                         var p = Expression.Parameter (typeof (B), "b");
 373                         var l = Expression.Lambda<Func<B, A>> (
 374                                 Expression.AndAlso (p, p), p).Compile ();
 375
 376                         Assert.IsNotNull (l (null));
 377                 }
 378         }
 379 }