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

// Permission is hereby granted, free of charge, to any person obtaining
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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
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// 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
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// 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_Field
    {
        [Test]
        [ExpectedException (typeof (ArgumentNullException))]
        public void Arg1Null ()
        {
            Expression.Field (null, "NoField");
        }

        [Test]
        [ExpectedException (typeof (ArgumentNullException))]
        public void Arg2Null1 ()
        {
            Expression.Field (Expression.Constant (new MemberClass()), (string)null);
        }

        [Test]
        [ExpectedException (typeof (ArgumentNullException))]
        public void Arg2Null2 ()
        {
            Expression.Field (Expression.Constant (new MemberClass()), (FieldInfo)null);
        }

        [Test]
        [ExpectedException (typeof (ArgumentException))]
        public void NoField ()
        {
            Expression.Field (Expression.Constant (new MemberClass()), "NoField");
        }

        [Test]
        public void InstanceField ()
        {
            MemberExpression expr = Expression.Field (Expression.Constant (new MemberClass()), "TestField1");
            Assert.AreEqual (ExpressionType.MemberAccess, expr.NodeType, "Field#01");
            Assert.AreEqual (typeof (int), expr.Type, "Field#02");
            Assert.AreEqual ("value(MonoTests.System.Linq.Expressions.MemberClass).TestField1", expr.ToString(), "Field#03");
        }

        [Test]
        [ExpectedException (typeof (ArgumentException))]
        public void StaticField1 ()
        {
            // This will fail because access to a static field should be created using a FieldInfo and
            // not an instance plus the field name.
            Expression.Field (Expression.Constant (new MemberClass()), "StaticField");
        }

        [Test]
        public void StaticField2 ()
        {
            MemberExpression expr = Expression.Field (null, MemberClass.GetStaticFieldInfo());
            Assert.AreEqual (ExpressionType.MemberAccess, expr.NodeType, "Field#07");
            Assert.AreEqual (typeof (int), expr.Type, "Field#08");
            Assert.AreEqual ("MemberClass.StaticField", expr.ToString(), "Field#09");
        }

    }
}