mono/mcs/class/System.Core/Test/System.Linq.Expressions/ExpressionTest_AddChecked.cs

// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
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// 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:
//        Federico Di Gregorio <[email protected]>

using System;
using System.Reflection;
using System.Linq;
using System.Linq.Expressions;
using NUnit.Framework;

namespace MonoTests.System.Linq.Expressions
{    
    [TestFixture]
    public class ExpressionTest_AddChecked
    {
        [Test]
        [ExpectedException (typeof (ArgumentNullException))]
        public void Arg1Null ()
        {
            Expression.AddChecked (null, Expression.Constant(1));
        }

        [Test]
        [ExpectedException (typeof (ArgumentNullException))]
        public void Arg2Null ()
        {
            Expression.AddChecked (Expression.Constant (1), null);
        }

        [Test]
        [ExpectedException (typeof (InvalidOperationException))]
        public void ArgTypesDifferent ()
        {
            Expression.AndAlso (Expression.Constant (1), Expression.Constant (2.0));
        }

        [Test]
        [ExpectedException (typeof (InvalidOperationException))]
        public void NoOperatorClass ()
        {
            Expression.AddChecked (Expression.Constant (new NoOpClass ()), Expression.Constant (new NoOpClass ()));
        }

        [Test]
        public void Numeric ()
        {
            BinaryExpression expr = Expression.AddChecked (Expression.Constant (1), Expression.Constant (2));
            Assert.AreEqual (ExpressionType.AddChecked, expr.NodeType, "AddChecked#01");
            Assert.AreEqual (typeof (int), expr.Type, "AddChecked#02");
            Assert.IsNull (expr.Method, "AddChecked#03");
            Assert.AreEqual ("(1 + 2)", expr.ToString(), "AddChecked#15");
        }

        [Test]
        public void Nullable ()
        {
            int? a = 1;
            int? b = 2;
            
            BinaryExpression expr = Expression.AddChecked (Expression.Constant (a), Expression.Constant (b));
            Assert.AreEqual (ExpressionType.AddChecked, expr.NodeType, "AddChecked#04");
            Assert.AreEqual (typeof (int), expr.Type, "AddChecked#05");
            Assert.IsNull (expr.Method, null, "AddChecked#06");
            Assert.AreEqual ("(1 + 2)", expr.ToString(), "AddChecked#16");
        }

        [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_Addition");
            
            BinaryExpression expr = Expression.AddChecked (Expression.Constant (new OpClass ()), Expression.Constant (new OpClass ()));
            Assert.AreEqual (ExpressionType.AddChecked, expr.NodeType, "AddChecked#07");
            Assert.AreEqual (typeof (OpClass), expr.Type, "AddChecked#08");
            Assert.AreEqual (mi, expr.Method, "AddChecked#09");
            Assert.AreEqual ("op_Addition", expr.Method.Name, "AddChecked#10");
            Assert.AreEqual ("(value(MonoTests.System.Linq.Expressions.OpClass) + value(MonoTests.System.Linq.Expressions.OpClass))",
                expr.ToString(), "AddChecked#17");
        }

        [Test]
        public void UserDefinedStruct ()
        {
            // 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 (OpStruct).GetMethod ("op_Addition");
            
            BinaryExpression expr = Expression.AddChecked (Expression.Constant (new OpStruct ()), Expression.Constant (new OpStruct ()));
            Assert.AreEqual (ExpressionType.AddChecked, expr.NodeType, "AddChecked#11");
            Assert.AreEqual (typeof (OpStruct), expr.Type, "AddChecked#12");
            Assert.AreEqual (mi, expr.Method, "AddChecked#13");
            Assert.AreEqual ("op_Addition", expr.Method.Name, "AddChecked#14");
            Assert.AreEqual ("(value(MonoTests.System.Linq.Expressions.OpStruct) + value(MonoTests.System.Linq.Expressions.OpStruct))",
                expr.ToString(), "AddChecked#18");
        }

    }
}