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// 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.
// Ad
// 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:
// Federico Di Gregorio <fog@initd.org>
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_Subtract
{
[Test]
[ExpectedException (typeof (ArgumentNullException))]
public void Arg1Null ()
{
Expression.Subtract (null, Expression.Constant (1));
}
[Test]
[ExpectedException (typeof (ArgumentNullException))]
public void Arg2Null ()
{
Expression.Subtract (Expression.Constant (1), null);
}
[Test]
[ExpectedException (typeof (InvalidOperationException))]
public void ArgTypesDifferent ()
{
Expression.Subtract (Expression.Constant (1), Expression.Constant (2.0));
}
[Test]
[ExpectedException (typeof (InvalidOperationException))]
public void NoOperatorClass ()
{
Expression.Subtract (Expression.Constant (new NoOpClass ()), Expression.Constant (new NoOpClass ()));
}
[Test]
[ExpectedException (typeof (InvalidOperationException))]
public void Boolean ()
{
Expression.Subtract (Expression.Constant (true), Expression.Constant (false));
}
[Test]
public void Numeric ()
{
BinaryExpression expr = Expression.Subtract (Expression.Constant (1), Expression.Constant (2));
Assert.AreEqual (ExpressionType.Subtract, expr.NodeType, "Subtract#01");
Assert.AreEqual (typeof (int), expr.Type, "Subtract#02");
Assert.IsNull (expr.Method, "Subtract#03");
Assert.AreEqual ("(1 - 2)", expr.ToString(), "Subtract#04");
}
[Test]
public void Nullable ()
{
int? a = 1;
int? b = 2;
BinaryExpression expr = Expression.Subtract (Expression.Constant (a), Expression.Constant (b));
Assert.AreEqual (ExpressionType.Subtract, expr.NodeType, "Subtract#05");
Assert.AreEqual (typeof (int), expr.Type, "Subtract#06");
Assert.IsNull (expr.Method, "Subtract#07");
Assert.AreEqual ("(1 - 2)", expr.ToString(), "Subtract#08");
}
[Test]
public void UserDefinedClass ()
{
// We can use the simplest version of GetMethod because we already know only one
// exists in the very simple class we're using for the tests.
MethodInfo mi = typeof (OpClass).GetMethod ("op_Subtraction");
BinaryExpression expr = Expression.Subtract (Expression.Constant (new OpClass ()), Expression.Constant (new OpClass ()));
Assert.AreEqual (ExpressionType.Subtract, expr.NodeType, "Subtract#09");
Assert.AreEqual (typeof (OpClass), expr.Type, "Subtract#10");
Assert.AreEqual (mi, expr.Method, "Subtract#11");
Assert.AreEqual ("op_Subtraction", expr.Method.Name, "Subtract#12");
Assert.AreEqual ("(value(MonoTests.System.Linq.Expressions.OpClass) - value(MonoTests.System.Linq.Expressions.OpClass))",
expr.ToString(), "Subtract#13");
}
[Test]
public void CompileSubtract ()
{
var left = Expression.Parameter (typeof (int), "l");
var right = Expression.Parameter (typeof (int), "r");
var l = Expression.Lambda<Func<int, int, int>> (
Expression.Subtract (left, right), left, right);
var be = l.Body as BinaryExpression;
Assert.IsNotNull (be);
Assert.AreEqual (typeof (int), be.Type);
Assert.IsFalse (be.IsLifted);
Assert.IsFalse (be.IsLiftedToNull);
var c = l.Compile ();
Assert.AreEqual (0, c (6, 6));
Assert.AreEqual (-2, c (-1, 1));
Assert.AreEqual (4, c (1, -3));
}
}
}
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