1 // Permission is hereby granted, free of charge, to any person obtaining
2 // a copy of this software and associated documentation files (the
3 // "Software"), to deal in the Software without restriction, including
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:
9 // The above copyright notice and this permission notice shall be
10 // included in all copies or substantial portions of the Software.
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
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17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
20 // Federico Di Gregorio <fog@initd.org>
23 using System.Reflection;
25 using System.Linq.Expressions;
26 using NUnit.Framework;
28 namespace MonoTests.System.Linq.Expressions
31 public class ExpressionTest_Coalesce
34 [ExpectedException (typeof (ArgumentNullException))]
35 public void Arg1Null ()
37 Expression.Coalesce (null, Expression.Constant (1));
41 [ExpectedException (typeof (ArgumentNullException))]
42 public void Arg2Null ()
44 Expression.Coalesce (Expression.Constant (1), null);
48 [ExpectedException (typeof (InvalidOperationException))]
49 public void NonNullLeftParameter ()
51 // This throws because they are both doubles, which are never
52 Expression.Coalesce (Expression.Constant (1.0), Expression.Constant (2.0));
56 [ExpectedException (typeof (ArgumentException))]
57 public void Incompatible_Arguments ()
59 // The artuments are not compatible
60 Expression.Coalesce (Expression.Parameter (typeof (int?), "a"),
61 Expression.Parameter (typeof (bool), "b"));
65 public void Coalesce_1 ()
67 // Build the expression by hand for now:
68 ParameterExpression pa = Expression.Parameter (typeof (int?), "a");
69 ParameterExpression pb = Expression.Parameter (typeof (int?), "b");
70 BinaryExpression c = Expression.Coalesce (pa, pb);
72 Expression<Func<int?, int?, int?>> e = Expression.Lambda<Func<int?,int?,int?>>(
73 c, new ParameterExpression [] { pa, pb });
75 Func<int?,int?,int?> comp = e.Compile ();
77 Assert.AreEqual (10, comp (10, 20));