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

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   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
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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.
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  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                 }
  84
  85                 [Test]
  86                 public void UserDefinedClass ()
  87                 {
  88                         // We can use the simplest version of GetMethod because we already know only one
  89                         // exists in the very simple class we're using for the tests.
  90                         MethodInfo mi = typeof (OpClass).GetMethod ("op_BitwiseAnd");
  91
  92                         BinaryExpression expr = Expression.AndAlso (Expression.Constant (new OpClass ()), Expression.Constant (new OpClass ()));
  93                         Assert.AreEqual (ExpressionType.AndAlso, expr.NodeType, "AndAlso#05");
  94                         Assert.AreEqual (typeof (OpClass), expr.Type, "AndAlso#06");
  95                         Assert.AreEqual (mi, expr.Method, "AndAlso#07");
  96                         Assert.AreEqual ("op_BitwiseAnd", expr.Method.Name, "AndAlso#08");
  97                 }
  98
  99                 [Test]
 100                 public void AndAlsoTest ()
 101                 {
 102                         var a = Expression.Parameter (typeof (bool), "a");
 103                         var b = Expression.Parameter (typeof (bool), "b");
 104                         var l = Expression.Lambda<Func<bool, bool, bool>> (
 105                                 Expression.AndAlso (a, b), a, b);
 106
 107                         var be = l.Body as BinaryExpression;
 108                         Assert.IsNotNull (be);
 109                         Assert.AreEqual (typeof (bool), be.Type);
 110                         Assert.IsFalse (be.IsLifted);
 111                         Assert.IsFalse (be.IsLiftedToNull);
 112
 113                         var c = l.Compile ();
 114
 115                         Assert.AreEqual (true,  c (true, true), "a1");
 116                         Assert.AreEqual (false, c (true, false), "a2");
 117                         Assert.AreEqual (false, c (false, true), "a3");
 118                         Assert.AreEqual (false, c (false, false), "a4");
 119                 }
 120
 121                 [Test]
 122                 public void AndAlsoLifted ()
 123                 {
 124                         var b = Expression.AndAlso (
 125                                 Expression.Constant (null, typeof (bool?)),
 126                                 Expression.Constant (null, typeof (bool?)));
 127
 128                         Assert.AreEqual (typeof (bool?), b.Type);
 129                         Assert.IsTrue (b.IsLifted);
 130                         Assert.IsTrue (b.IsLiftedToNull);
 131                 }
 132
 133                 [Test]
 134                 public void AndAlsoNotLifted ()
 135                 {
 136                         var b = Expression.AndAlso (
 137                                 Expression.Constant (true, typeof (bool)),
 138                                 Expression.Constant (true, typeof (bool)));
 139
 140                         Assert.AreEqual (typeof (bool), b.Type);
 141                         Assert.IsFalse (b.IsLifted);
 142                         Assert.IsFalse (b.IsLiftedToNull);
 143                 }
 144
 145                 [Test]
 146                 public void AndAlsoTestNullable ()
 147                 {
 148                         var a = Expression.Parameter (typeof (bool?), "a");
 149                         var b = Expression.Parameter (typeof (bool?), "b");
 150                         var l = Expression.Lambda<Func<bool?, bool?, bool?>> (
 151                                 Expression.AndAlso (a, b), a, b);
 152
 153                         var be = l.Body as BinaryExpression;
 154                         Assert.IsNotNull (be);
 155                         Assert.AreEqual (typeof (bool?), be.Type);
 156                         Assert.IsTrue (be.IsLifted);
 157                         Assert.IsTrue (be.IsLiftedToNull);
 158
 159                         var c = l.Compile ();
 160
 161                         Assert.AreEqual (true,  c (true, true), "a1");
 162                         Assert.AreEqual (false, c (true, false), "a2");
 163                         Assert.AreEqual (false, c (false, true), "a3");
 164                         Assert.AreEqual (false, c (false, false), "a4");
 165
 166                         Assert.AreEqual (null,  c (true, null), "a5");
 167                         Assert.AreEqual (false, c (false, null), "a6");
 168                         Assert.AreEqual (false, c (null, false), "a7");
 169                         Assert.AreEqual (null,  c (true, null), "a8");
 170                         Assert.AreEqual (null,  c (null, null), "a9");
 171                 }
 172
 173                 [Test]
 174                 public void AndAlsoBoolItem ()
 175                 {
 176                         var i = Expression.Parameter (typeof (Item<bool>), "i");
 177                         var and = Expression.Lambda<Func<Item<bool>, bool>> (
 178                                 Expression.AndAlso (
 179                                         Expression.Property (i, "Left"),
 180                                         Expression.Property (i, "Right")), i).Compile ();
 181
 182                         var item = new Item<bool> (false, true);
 183                         Assert.AreEqual (false, and (item));
 184                         Assert.IsTrue (item.LeftCalled);
 185                         Assert.IsFalse (item.RightCalled);
 186                 }
 187
 188                 [Test]
 189                 public void AndAlsoNullableBoolItem ()
 190                 {
 191                         var i = Expression.Parameter (typeof (Item<bool?>), "i");
 192                         var and = Expression.Lambda<Func<Item<bool?>, bool?>> (
 193                                 Expression.AndAlso (
 194                                         Expression.Property (i, "Left"),
 195                                         Expression.Property (i, "Right")), i).Compile ();
 196
 197                         var item = new Item<bool?> (false, true);
 198                         Assert.AreEqual ((bool?) false, and (item));
 199                         Assert.IsTrue (item.LeftCalled);
 200                         Assert.IsFalse (item.RightCalled);
 201                 }
 202
 203                 struct Slot {
 204
 205                         public int Value;
 206
 207                         public Slot (int val)
 208                         {
 209                                 this.Value = val;
 210                         }
 211
 212                         public static Slot operator & (Slot a, Slot b)
 213                         {
 214                                 return new Slot (a.Value & b.Value);
 215                         }
 216
 217                         public static bool operator true (Slot a)
 218                         {
 219                                 return a.Value != 0;
 220                         }
 221
 222                         public static bool operator false (Slot a)
 223                         {
 224                                 return a.Value == 0;
 225                         }
 226
 227                         public override string ToString ()
 228                         {
 229                                 return Value.ToString ();
 230                         }
 231                 }
 232
 233                 [Test]
 234                 public void UserDefinedAndAlso ()
 235                 {
 236                         var l = Expression.Parameter (typeof (Slot), "l");
 237                         var r = Expression.Parameter (typeof (Slot), "r");
 238
 239                         var method = typeof (Slot).GetMethod ("op_BitwiseAnd");
 240
 241                         var node = Expression.AndAlso (l, r, method);
 242                         Assert.IsFalse (node.IsLifted);
 243                         Assert.IsFalse (node.IsLiftedToNull);
 244                         Assert.AreEqual (method, node.Method);
 245
 246                         var andalso = Expression.Lambda<Func<Slot, Slot, Slot>> (node, l, r).Compile ();
 247
 248                         Assert.AreEqual (new Slot (64), andalso (new Slot (64), new Slot (64)));
 249                         Assert.AreEqual (new Slot (0), andalso (new Slot (32), new Slot (64)));
 250                         Assert.AreEqual (new Slot (0), andalso (new Slot (64), new Slot (32)));
 251                 }
 252
 253                 [Test]
 254                 public void UserDefinedAndAlsoShortCircuit ()
 255                 {
 256                         var i = Expression.Parameter (typeof (Item<Slot>), "i");
 257                         var and = Expression.Lambda<Func<Item<Slot>, Slot>> (
 258                                 Expression.AndAlso (
 259                                         Expression.Property (i, "Left"),
 260                                         Expression.Property (i, "Right")), i).Compile ();
 261
 262                         var item = new Item<Slot> (new Slot (0), new Slot (1));
 263                         Assert.AreEqual (new Slot (0), and (item));
 264                         Assert.IsTrue (item.LeftCalled);
 265                         Assert.IsFalse (item.RightCalled);
 266                 }
 267
 268                 [Test]
 269                 [Category ("NotDotNet")] // https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=350228
 270                 public void UserDefinedLiftedAndAlsoShortCircuit ()
 271                 {
 272                         var i = Expression.Parameter (typeof (Item<Slot?>), "i");
 273                         var and = Expression.Lambda<Func<Item<Slot?>, Slot?>> (
 274                                 Expression.AndAlso (
 275                                         Expression.Property (i, "Left"),
 276                                         Expression.Property (i, "Right")), i).Compile ();
 277
 278                         var item = new Item<Slot?> (null, new Slot (1));
 279                         Assert.AreEqual ((Slot?) null, and (item));
 280                         Assert.IsTrue (item.LeftCalled);
 281                         Assert.IsFalse (item.RightCalled);
 282                 }
 283
 284                 [Test]
 285                 public void UserDefinedAndAlsoLiftedToNull ()
 286                 {
 287                         var l = Expression.Parameter (typeof (Slot?), "l");
 288                         var r = Expression.Parameter (typeof (Slot?), "r");
 289
 290                         var method = typeof (Slot).GetMethod ("op_BitwiseAnd");
 291
 292                         var node = Expression.AndAlso (l, r, method);
 293                         Assert.IsTrue (node.IsLifted);
 294                         Assert.IsTrue (node.IsLiftedToNull);
 295                         Assert.AreEqual (method, node.Method);
 296
 297                         var andalso = Expression.Lambda<Func<Slot?, Slot?, Slot?>> (node, l, r).Compile ();
 298
 299                         Assert.AreEqual (new Slot (64), andalso (new Slot (64), new Slot (64)));
 300                         Assert.AreEqual (new Slot (0), andalso (new Slot (32), new Slot (64)));
 301                         Assert.AreEqual (new Slot (0), andalso (new Slot (64), new Slot (32)));
 302                         Assert.AreEqual (null, andalso (null, new Slot (32)));
 303                         Assert.AreEqual (null, andalso (new Slot (64), null));
 304                         Assert.AreEqual (null, andalso (null, null));
 305                 }
 306
 307                 struct Incomplete {
 308                         public int Value;
 309
 310                         public Incomplete (int val)
 311                         {
 312                                 Value = val;
 313                         }
 314
 315                         public static Incomplete operator & (Incomplete a, Incomplete b)
 316                         {
 317                                 return new Incomplete (a.Value & b.Value);
 318                         }
 319                 }
 320
 321                 [Test]
 322                 [ExpectedException (typeof (ArgumentException))]
 323                 public void IncompleteUserDefinedAndAlso ()
 324                 {
 325                         var l = Expression.Parameter (typeof (Incomplete), "l");
 326                         var r = Expression.Parameter (typeof (Incomplete), "r");
 327
 328                         var method = typeof (Incomplete).GetMethod ("op_BitwiseAnd");
 329
 330                         Expression.AndAlso (l, r, method);
 331                 }
 332
 333                 class A {
 334                         public static bool operator true (A x)
 335                         {
 336                                 return true;
 337                         }
 338
 339                         public static bool operator false (A x)
 340                         {
 341                                 return false;
 342                         }
 343                 }
 344
 345                 class B : A {
 346                         public static B operator & (B x, B y)
 347                         {
 348                                 return new B ();
 349                         }
 350
 351                         public static bool op_True<T> (B x)
 352                         {
 353                                 return true;
 354                         }
 355
 356                         public static bool op_False (B x)
 357                         {
 358                                 return false;
 359                         }
 360                 }
 361
 362                 [Test] // from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=350487
 363                 public void Connect350487 ()
 364                 {
 365                         var p = Expression.Parameter (typeof (B), "b");
 366                         var l = Expression.Lambda<Func<B, A>> (
 367                                 Expression.AndAlso (p, p), p).Compile ();
 368
 369                         Assert.IsNotNull (l (null));
 370                 }
 371         }
 372 }