mono/mcs/class/System.Core/Test/System.Linq.Expressions/ExpressionTest_OrElse.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_OrElse
	{
		[Test]
		[ExpectedException (typeof (ArgumentNullException))]
		public void Arg1Null ()
		{
			Expression.OrElse (null, Expression.Constant (1));
		}

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

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

		[Test]
		[ExpectedException (typeof (InvalidOperationException))]
		public void Double ()
		{
			Expression.OrElse (Expression.Constant (1.0), Expression.Constant (2.0));
		}

		[Test]
		[ExpectedException (typeof (InvalidOperationException))]
		public void Integer ()
		{
			Expression.OrElse (Expression.Constant (1), Expression.Constant (2));
		}

		[Test]
		[ExpectedException (typeof (InvalidOperationException))]
		public void MismatchedTypes ()
		{
			Expression.OrElse (Expression.Constant (new OpClass ()), Expression.Constant (true));
		}

		[Test]
		public void Boolean ()
		{
			BinaryExpression expr = Expression.OrElse (Expression.Constant (true), Expression.Constant (false));
			Assert.AreEqual (ExpressionType.OrElse, expr.NodeType, "OrElse#01");
			Assert.AreEqual (typeof (bool), expr.Type, "OrElse#02");
			Assert.IsNull (expr.Method, "OrElse#03");
			Assert.AreEqual ("(True || False)", expr.ToString(), "OrElse#04");
		}

		[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_BitwiseOr");

			BinaryExpression expr = Expression.OrElse (Expression.Constant (new OpClass ()), Expression.Constant (new OpClass ()));
			Assert.AreEqual (ExpressionType.OrElse, expr.NodeType, "OrElse#05");
			Assert.AreEqual (typeof (OpClass), expr.Type, "OrElse#06");
			Assert.AreEqual (mi, expr.Method, "OrElse#07");
			Assert.AreEqual ("op_BitwiseOr", expr.Method.Name, "OrElse#08");
			Assert.AreEqual ("(value(MonoTests.System.Linq.Expressions.OpClass) || value(MonoTests.System.Linq.Expressions.OpClass))",
				expr.ToString(), "OrElse#09");
		}

		public class BrokenMethod {
			public static int operator | (BrokenMethod a, BrokenMethod b)
			{
				return 1;
			}
		}

		public class BrokenMethod2 {
			public static BrokenMethod2 operator | (BrokenMethod2 a, int b)
			{
				return null;
			}
		}

		[Test]
		[ExpectedException(typeof(ArgumentException))]
		public void MethodInfoReturnType ()
		{
			Expression.OrElse (Expression.Constant (new BrokenMethod ()),
					   Expression.Constant (new BrokenMethod ()));
		}

		[Test]
		[ExpectedException(typeof(ArgumentException))]
		public void MethodInfoReturnType2 ()
		{
			Expression.OrElse (Expression.Constant (new BrokenMethod2 ()),
					   Expression.Constant (1));
		}

		[Test]
		public void OrElseNotLifted ()
		{
			var b = Expression.OrElse (
				Expression.Constant (true, typeof (bool)),
				Expression.Constant (true, typeof (bool)));

			Assert.AreEqual (typeof (bool), b.Type);
			Assert.IsFalse (b.IsLifted);
			Assert.IsFalse (b.IsLiftedToNull);
		}

		[Test]
		public void OrElseTest ()
		{
			ParameterExpression a = Expression.Parameter (typeof (bool), "a"), b = Expression.Parameter (typeof (bool), "b");
			var l = Expression.Lambda<Func<bool, bool, bool>> (
				Expression.OrElse (a, b), a, b);

			var be = l.Body as BinaryExpression;
			Assert.IsNotNull (be);
			Assert.AreEqual (typeof (bool), be.Type);
			Assert.IsFalse (be.IsLifted);
			Assert.IsFalse (be.IsLiftedToNull);

			var c = l.Compile ();

			Assert.AreEqual (true,  c (true, true), "o1");
			Assert.AreEqual (true,  c (true, false), "o2");
			Assert.AreEqual (true,  c (false, true), "o3");
			Assert.AreEqual (false, c (false, false), "o4");
		}

		[Test]
		public void OrElseLifted ()
		{
			var b = Expression.OrElse (
				Expression.Constant (null, typeof (bool?)),
				Expression.Constant (null, typeof (bool?)));

			Assert.AreEqual (typeof (bool?), b.Type);
			Assert.IsTrue (b.IsLifted);
			Assert.IsTrue (b.IsLiftedToNull);
		}

		[Test]
		public void OrElseTestNullable ()
		{
			ParameterExpression a = Expression.Parameter (typeof (bool?), "a"), b = Expression.Parameter (typeof (bool?), "b");
			var l = Expression.Lambda<Func<bool?, bool?, bool?>> (
				Expression.OrElse (a, b), a, b);

			var be = l.Body as BinaryExpression;
			Assert.IsNotNull (be);
			Assert.AreEqual (typeof (bool?), be.Type);
			Assert.IsTrue (be.IsLifted);
			Assert.IsTrue (be.IsLiftedToNull);

			var c = l.Compile ();

			Assert.AreEqual (true,  c (true, true),   "o1");
			Assert.AreEqual (true,  c (true, false),  "o2");
			Assert.AreEqual (true,  c (false, true),  "o3");
			Assert.AreEqual (false, c (false, false), "o4");

			Assert.AreEqual (true, c (true, null),  "o5");
			Assert.AreEqual (null, c (false, null), "o6");
			Assert.AreEqual (null, c (null, false), "o7");
			Assert.AreEqual (true, c (true, null),  "o8");
			Assert.AreEqual (null, c (null, null),  "o9");
		}
	}
}