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

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

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

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

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

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

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

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

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