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//
// ExpressionTest_Lift: this contains tests for the various lifting settings in binary expressions
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
//
// Authors:
// Miguel de Icaza (miguel@novell.com)
//
using System;
using System.Reflection;
using System.Linq;
using System.Linq.Expressions;
using NUnit.Framework;
namespace MonoTests.System.Linq.Expressions
{
[TestFixture]
[Category("SRE")]
public class ExpressionTest_Lifting
{
[Test]
public void TestLiftOnEqual ()
{
ConstantExpression a = Expression.Constant (1, typeof (int?));
ConstantExpression b = Expression.Constant (1, typeof (int?));
BinaryExpression cmp = Expression.Equal (a, b);
Assert.AreEqual (true, cmp.IsLifted, "IsLifted");
Assert.AreEqual (false, cmp.IsLiftedToNull, "IsLiftedToNull");
Assert.AreEqual (typeof(bool), cmp.Type, "type");
}
[Test]
public void TestLiftOnEqual_ForcedLifted ()
{
ConstantExpression a = Expression.Constant (1, typeof (int?));
ConstantExpression b = Expression.Constant (1, typeof (int?));
// Force the lift on equal
BinaryExpression cmp = Expression.Equal (a, b, true, null);
Assert.AreEqual (true, cmp.IsLifted, "IsLifted");
Assert.AreEqual (true, cmp.IsLiftedToNull, "IsLiftedToNull");
Assert.AreEqual (typeof(bool?), cmp.Type);
}
static MethodInfo GM(string n)
{
MethodInfo [] m = typeof(ExpressionTest_Lifting).GetMethods(BindingFlags.Static | BindingFlags.Public);
foreach (MethodInfo mm in m)
if (mm.Name == n)
return mm;
throw new Exception("No method found: " + n);
}
static public int MyCompare (OpStruct a, OpStruct b)
{
return 1;
}
[Test]
public void TestLiftOnEqual_WithMethodInfo ()
{
ConstantExpression a = Expression.Constant (new OpStruct (), typeof (OpStruct?));
ConstantExpression b = Expression.Constant (null, typeof (OpStruct?));
// Force the lift on equal
BinaryExpression cmp = Expression.Equal (a, b, true, GM("MyCompare"));
Assert.AreEqual (true, cmp.IsLifted, "IsLifted");
Assert.AreEqual (true, cmp.IsLiftedToNull, "IsLiftedToNull");
BinaryExpression cmp2 = Expression.Equal (a, b, false, GM("MyCompare"));
//
// When we use a MethodInfo, that has a non-bool return type,
// the result is always Nullable<returntype> regardless of the
// setting of "liftToNull"
//
Assert.AreEqual (typeof(int?), cmp.Type);
Assert.AreEqual (typeof(int?), cmp2.Type);
}
}
}
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