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

//
// ExpressionTest_ArrayLength.cs
//
// Author:
//   Federico Di Gregorio <[email protected]>
//   Jb Evain ([email protected])
//
// (C) 2008 Novell, Inc. (http://www.novell.com)
//
// 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
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

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

namespace MonoTests.System.Linq.Expressions
{
	[TestFixture]
	public class ExpressionTest_ArrayLength
	{
		[Test]
		[ExpectedException (typeof (ArgumentNullException))]
		public void Arg1Null ()
		{
			Expression.ArrayLength (null);
		}

		[Test]
		[ExpectedException (typeof (ArgumentException))]
		public void Arg1NotArray ()
		{
			Expression.ArrayLength (Expression.Constant ("This is not an array!"));
		}

		[Test]
		public void Rank1String ()
		{
			string[] array = { "a", "b", "c" };

			UnaryExpression expr = Expression.ArrayLength (Expression.Constant (array));
			Assert.AreEqual (ExpressionType.ArrayLength, expr.NodeType, "ArrayLength#01");
			Assert.AreEqual (typeof (int), expr.Type, "ArrayLength#02");
			Assert.IsNull (expr.Method, "ArrayLength#03");
			Assert.AreEqual ("ArrayLength(value(System.String[]))", expr.ToString(), "ArrayLength#04");
		}

		[Test]
		[ExpectedException (typeof (ArgumentException))]
		public void Rank2String ()
		{
			string[,] array = {{ }, { }};

			Expression.ArrayLength (Expression.Constant (array));
		}

		[Test]
		public void CompileArrayLength ()
		{
			var p = Expression.Parameter (typeof (object []), "ary");
			var len = Expression.Lambda<Func<object [], int>> (
				Expression.ArrayLength (p), p).Compile ();

			Assert.AreEqual (0, len (new string [0]));
			Assert.AreEqual (2, len (new [] { "jb", "evain" }));
		}
	}
}