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

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

		[Test]
		[ExpectedException (typeof (InvalidOperationException))]
		public void ArgTypesDifferent ()
		{
			Expression.Modulo (Expression.Constant (1), Expression.Constant (2.0));
		}

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

		[Test]
		[ExpectedException (typeof (InvalidOperationException))]
		public void Boolean ()
		{
			Expression.Modulo (Expression.Constant (true), Expression.Constant (false));
		}

		[Test]
		public void Double ()
		{
			BinaryExpression expr = Expression.Modulo (Expression.Constant (1.0), Expression.Constant (2.0));
			Assert.AreEqual (ExpressionType.Modulo, expr.NodeType, "Modulo#14");
			Assert.AreEqual (typeof (double), expr.Type, "Modulo#15");
			Assert.IsNull (expr.Method, "Modulo#16");
			Assert.AreEqual ("(1 % 2)", expr.ToString(), "Modulo#17");
		}

		[Test]
		public void Numeric ()
		{
			BinaryExpression expr = Expression.Modulo (Expression.Constant (1), Expression.Constant (2));
			Assert.AreEqual (ExpressionType.Modulo, expr.NodeType, "Modulo#01");
			Assert.AreEqual (typeof (int), expr.Type, "Modulo#02");
			Assert.IsNull (expr.Method, "Modulo#03");
			Assert.AreEqual ("(1 % 2)", expr.ToString(), "Modulo#04");
		}

		[Test]
		public void Nullable ()
		{
			int? a = 1;
			int? b = 2;

			BinaryExpression expr = Expression.Modulo (Expression.Constant (a), Expression.Constant (b));
			Assert.AreEqual (ExpressionType.Modulo, expr.NodeType, "Modulo#05");
			Assert.AreEqual (typeof (int), expr.Type, "Modulo#06");
			Assert.IsNull (expr.Method, "Modulo#07");
			Assert.AreEqual ("(1 % 2)", expr.ToString(), "Modulo#08");
		}

		[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_Modulus");

			BinaryExpression expr = Expression.Modulo (Expression.Constant (new OpClass ()), Expression.Constant (new OpClass ()));
			Assert.AreEqual (ExpressionType.Modulo, expr.NodeType, "Modulo#09");
			Assert.AreEqual (typeof (OpClass), expr.Type, "Modulo#10");
			Assert.AreEqual (mi, expr.Method, "Modulo#11");
			Assert.AreEqual ("op_Modulus", expr.Method.Name, "Modulo#12");
			Assert.AreEqual ("(value(MonoTests.System.Linq.Expressions.OpClass) % value(MonoTests.System.Linq.Expressions.OpClass))",
				expr.ToString(), "Modulo#13");
		}

		[Test]
		public void CompiledModulo ()
		{
			var l = Expression.Parameter (typeof (double), "l");
			var p = Expression.Parameter (typeof (double), "r");

			var modulo = Expression.Lambda<Func<double, double, double>> (
				Expression.Modulo (l, p), l, p).Compile ();

			Assert.AreEqual (0, modulo (4.0, 2.0));
			Assert.AreEqual (2.0, modulo (5.0, 3.0));
		}
	}
}