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

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//
// 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_Property
	{
		[Test]
		[ExpectedException (typeof (ArgumentNullException))]
		public void Arg1Null ()
		{
			Expression.Property (null, "NoProperty");
		}

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

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

		[Test]
		[ExpectedException (typeof (ArgumentNullException))]
		public void Arg2Null3 ()
		{
			Expression.Property (Expression.Constant (new MemberClass()), (MethodInfo)null);
		}

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

		[Test]
		public void InstanceProperty1 ()
		{
			MemberExpression expr = Expression.Property (Expression.Constant (new MemberClass()), "TestProperty1");
			Assert.AreEqual (ExpressionType.MemberAccess, expr.NodeType, "Property#01");
			Assert.AreEqual (typeof (int), expr.Type, "Property#02");
			Assert.AreEqual ("value(MonoTests.System.Linq.Expressions.MemberClass).TestProperty1", expr.ToString(), "Property#03");
		}

		[Test]
		public void InstanceProperty2 ()
		{
			MemberExpression expr = Expression.Property (Expression.Constant (new MemberClass()), MemberClass.GetRoPropertyInfo());
			Assert.AreEqual (ExpressionType.MemberAccess, expr.NodeType, "Property#04");
			Assert.AreEqual (typeof (int), expr.Type, "Property#05");
			Assert.AreEqual ("value(MonoTests.System.Linq.Expressions.MemberClass).TestProperty1", expr.ToString(), "Property#06");
		}

		[Test]
		public void InstanceProperty3 ()
		{
			MethodInfo mi = typeof(MemberClass).GetMethod("get_TestProperty1");

			MemberExpression expr = Expression.Property (Expression.Constant (new MemberClass()), mi);
			Assert.AreEqual (ExpressionType.MemberAccess, expr.NodeType, "Property#07");
			Assert.AreEqual (typeof (int), expr.Type, "Property#08");
			Assert.AreEqual ("value(MonoTests.System.Linq.Expressions.MemberClass).TestProperty1", expr.ToString(), "Property#09");
			Assert.AreEqual (MemberClass.GetRoPropertyInfo(), expr.Member, "Property#10");
		}

		[Test]
		[ExpectedException (typeof (ArgumentException))]
		public void StaticProperty1 ()
		{
			// This will fail because access to a static field should be created using a PropertyInfo and
			// not an instance plus the field name.
			Expression.Property (Expression.Constant (new MemberClass()), "StaticProperty");
		}

		[Test]
		public void StaticProperty2 ()
		{
			MemberExpression expr = Expression.Property (null, MemberClass.GetStaticPropertyInfo());
			Assert.AreEqual (ExpressionType.MemberAccess, expr.NodeType, "Property#11");
			Assert.AreEqual (typeof (int), expr.Type, "Property#12");
			Assert.AreEqual ("MemberClass.StaticProperty", expr.ToString(), "Property#13");
		}

		[Test]
		public void StaticProperty3 ()
		{
			MethodInfo mi = typeof(MemberClass).GetMethod("get_StaticProperty");

			MemberExpression expr = Expression.Property (null, mi);
			Assert.AreEqual (ExpressionType.MemberAccess, expr.NodeType, "Property#14");
			Assert.AreEqual (typeof (int), expr.Type, "Property#15");
			Assert.AreEqual ("MemberClass.StaticProperty", expr.ToString(), "Property#16");
			Assert.AreEqual (MemberClass.GetStaticPropertyInfo(), expr.Member, "Property#17");
		}

		public class Foo {
			public string Prop { get; set; }

			public static string StatProp
			{
				get { return "StaticFoo"; }
			}
		}

		[Test]
		public void TestCompileGetInstanceProperty ()
		{
			var p = Expression.Parameter (typeof (Foo), "foo");
			var fooer = Expression.Lambda<Func<Foo, string>> (
				Expression.Property (p, typeof (Foo).GetProperty ("Prop")), p).Compile ();

			Assert.AreEqual ("foo", fooer (new Foo { Prop = "foo" }));
		}

		[Test]
		public void TestCompileGetStaticProperty ()
		{
			var sf = Expression.Lambda<Func<string>> (
				Expression.Property (null, typeof (Foo).GetProperty (
				"StatProp", BindingFlags.Public | BindingFlags.Static))).Compile ();

			Assert.AreEqual ("StaticFoo", sf ());
		}

		public struct Bar {
			private string slot;

			public string Prop {
				get { return slot; }
				set { slot = value; }
			}

			public Bar (string slot)
			{
				this.slot = slot;
			}
		}

		[Test]
		public void TestCompileGetInstancePropertyOnStruct ()
		{
			var p = Expression.Parameter (typeof (Bar), "bar");
			var barer = Expression.Lambda<Func<Bar, string>> (
				Expression.Property (p, typeof (Bar).GetProperty ("Prop")), p).Compile ();

			Assert.AreEqual ("bar", barer (new Bar ("bar")));
		}

		public static int StaticProperty {
			get { return 42; }
		}

		[Test]
		[Category ("NotDotNet")] // http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=339351
		[ExpectedException (typeof (ArgumentException))]
		public void StaticPropertyWithInstanceArgument ()
		{
			Expression.Property (
				Expression.Parameter (GetType (), "t"),
				GetType ().GetProperty ("StaticProperty"));
		}
	}
}