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

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  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
  22 using System;
  23 using System.Reflection;
  24 using System.Linq;
  25 using System.Linq.Expressions;
  26 using NUnit.Framework;
  27
  28 namespace MonoTests.System.Linq.Expressions
  29 {
  30         [TestFixture]
  31         public class ExpressionTest_SubtractChecked
  32         {
  33                 [Test]
  34                 [ExpectedException (typeof (ArgumentNullException))]
  35                 public void Arg1Null ()
  36                 {
  37                         Expression.SubtractChecked (null, Expression.Constant(1));
  38                 }
  39
  40                 [Test]
  41                 [ExpectedException (typeof (ArgumentNullException))]
  42                 public void Arg2Null ()
  43                 {
  44                         Expression.SubtractChecked (Expression.Constant (1), null);
  45                 }
  46
  47                 [Test]
  48                 [ExpectedException (typeof (InvalidOperationException))]
  49                 public void ArgTypesDifferent ()
  50                 {
  51                         Expression.SubtractChecked (Expression.Constant (1), Expression.Constant (2.0));
  52                 }
  53
  54                 [Test]
  55                 [ExpectedException (typeof (InvalidOperationException))]
  56                 public void NoOperatorClass ()
  57                 {
  58                         Expression.SubtractChecked (Expression.Constant (new NoOpClass ()), Expression.Constant (new NoOpClass ()));
  59                 }
  60
  61                 [Test]
  62                 [ExpectedException (typeof (InvalidOperationException))]
  63                 public void Boolean ()
  64                 {
  65                         Expression.SubtractChecked (Expression.Constant (true), Expression.Constant (false));
  66                 }
  67
  68                 [Test]
  69                 public void Numeric ()
  70                 {
  71                         BinaryExpression expr = Expression.SubtractChecked (Expression.Constant (1), Expression.Constant (2));
  72                         Assert.AreEqual (ExpressionType.SubtractChecked, expr.NodeType, "SubtractChecked#01");
  73                         Assert.AreEqual (typeof (int), expr.Type, "SubtractChecked#02");
  74                         Assert.IsNull (expr.Method, "SubtractChecked#03");
  75                         Assert.AreEqual ("(1 - 2)", expr.ToString(), "SubtractChecked#15");
  76                 }
  77
  78                 [Test]
  79                 public void Nullable ()
  80                 {
  81                         int? a = 1;
  82                         int? b = 2;
  83
  84                         BinaryExpression expr = Expression.SubtractChecked (Expression.Constant (a), Expression.Constant (b));
  85                         Assert.AreEqual (ExpressionType.SubtractChecked, expr.NodeType, "SubtractChecked#04");
  86                         Assert.AreEqual (typeof (int), expr.Type, "SubtractChecked#05");
  87                         Assert.IsNull (expr.Method, null, "SubtractChecked#06");
  88                         Assert.AreEqual ("(1 - 2)", expr.ToString(), "SubtractChecked#16");
  89                 }
  90
  91                 [Test]
  92                 public void UserDefinedClass ()
  93                 {
  94                         // We can use the simplest version of GetMethod because we already know only one
  95                         // exists in the very simple class we're using for the tests.
  96                         MethodInfo mi = typeof (OpClass).GetMethod ("op_Subtraction");
  97
  98                         BinaryExpression expr = Expression.SubtractChecked (Expression.Constant (new OpClass ()), Expression.Constant (new OpClass ()));
  99                         Assert.AreEqual (ExpressionType.SubtractChecked, expr.NodeType, "SubtractChecked#07");
 100                         Assert.AreEqual (typeof (OpClass), expr.Type, "SubtractChecked#08");
 101                         Assert.AreEqual (mi, expr.Method, "SubtractChecked#09");
 102                         Assert.AreEqual ("op_Subtraction", expr.Method.Name, "SubtractChecked#10");
 103                         Assert.AreEqual ("(value(MonoTests.System.Linq.Expressions.OpClass) - value(MonoTests.System.Linq.Expressions.OpClass))",
 104                                 expr.ToString(), "SubtractChecked#17");
 105                 }
 106
 107                 [Test]
 108                 public void UserDefinedStruct ()
 109                 {
 110                         // We can use the simplest version of GetMethod because we already know only one
 111                         // exists in the very simple class we're using for the tests.
 112                         MethodInfo mi = typeof (OpStruct).GetMethod ("op_Subtraction");
 113
 114                         BinaryExpression expr = Expression.SubtractChecked (Expression.Constant (new OpStruct ()), Expression.Constant (new OpStruct ()));
 115                         Assert.AreEqual (ExpressionType.SubtractChecked, expr.NodeType, "SubtractChecked#11");
 116                         Assert.AreEqual (typeof (OpStruct), expr.Type, "SubtractChecked#12");
 117                         Assert.AreEqual (mi, expr.Method, "SubtractChecked#13");
 118                         Assert.AreEqual ("op_Subtraction", expr.Method.Name, "SubtractChecked#14");
 119                         Assert.AreEqual ("(value(MonoTests.System.Linq.Expressions.OpStruct) - value(MonoTests.System.Linq.Expressions.OpStruct))",
 120                                 expr.ToString(), "SubtractChecked#18");
 121                 }
 122
 123                 //
 124                 // This method makes sure that compiling an AddChecked on two values
 125                 // throws an OverflowException, if it doesnt, it fails
 126                 //
 127                 static void MustOverflow<T> (T v1, T v2)
 128                 {
 129                         Expression<Func<T>> l = Expression.Lambda<Func<T>> (
 130                                 Expression.SubtractChecked (Expression.Constant (v1), Expression.Constant (v2)));
 131                         Func<T> del = l.Compile ();
 132                         T res = default (T);
 133                         try {
 134                                 res = del ();
 135                         } catch (OverflowException){
 136                                 // OK
 137                                 return;
 138                         }
 139                         throw new Exception (String.Format ("SubtractChecked on {2} should have thrown an exception with values {0} {1}, result was: {3}",
 140                                                             v1, v2, v1.GetType (), res));
 141                 }
 142
 143                 //
 144                 // This routine should execute the code, but not throw an
 145                 // overflow exception
 146                 //
 147                 static void MustNotOverflow<T> (T v1, T v2)
 148                 {
 149                         Expression<Func<T>> l = Expression.Lambda<Func<T>> (
 150                                 Expression.SubtractChecked (Expression.Constant (v1), Expression.Constant (v2)));
 151                         Func<T> del = l.Compile ();
 152                         del ();
 153                 }
 154
 155                 //
 156                 // SubtractChecked is not defined for small types (byte, sbyte)
 157                 //
 158                 static void InvalidOperation<T> (T v1, T v2)
 159                 {
 160                         try {
 161                                 Expression.Lambda<Func<T>> (
 162                                         Expression.SubtractChecked (Expression.Constant (v1), Expression.Constant (v2)));
 163                         } catch (InvalidOperationException){
 164                                 // OK
 165                                 return;
 166                         }
 167                         throw new Exception (String.Format ("SubtractChecked should have thrown for the creation of a tree with {0} operands", v1.GetType ()));
 168                 }
 169
 170                 [Test]
 171                 public void TestOverflows ()
 172                 {
 173                         // These should overflow, check the various types and codepaths
 174                         // in BinaryExpression:
 175                         MustOverflow<int> (Int32.MinValue, 1);
 176                         MustOverflow<int> (Int32.MaxValue, -1);
 177                         MustOverflow<long> (Int64.MinValue, 1);
 178                         MustOverflow<long> (Int64.MaxValue, -1);
 179
 180                         MustOverflow<ushort> (UInt16.MinValue, 1);
 181
 182                         // unsigned values use Sub_Ovf_Un, check that too:
 183                         MustOverflow<ulong> (0, 1);
 184                         MustOverflow<uint>  (0, 1);
 185                 }
 186
 187
 188                 //
 189                 // These should not overflow
 190                 //
 191                 [Test]
 192                 public void TestNoOverflow ()
 193                 {
 194                         // Simple stuff
 195                         MustNotOverflow<int> (10, 20);
 196
 197                         // There are invalid:
 198                         InvalidOperation<byte> (Byte.MinValue, 1);
 199                         InvalidOperation<sbyte> (SByte.MaxValue, 2);
 200
 201                         MustNotOverflow<short> (Int16.MaxValue, 2);
 202                         MustNotOverflow<ushort> (UInt16.MaxValue, 2);
 203
 204                         // Doubles, floats, do not overflow
 205                         MustNotOverflow<float> (Single.MaxValue, 1);
 206                         MustNotOverflow<double> (Double.MaxValue, 1);
 207                 }
 208         }
 209 }