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

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// without limitation the rights to use, copy, modify, merge, publish,
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// The above copyright notice and this permission notice shall be
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// 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");
		}

	}
}