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

// Permission is hereby granted, free of charge, to any person obtaining
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// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
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//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// Ad
// 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
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//
// Authors:
//		Federico Di Gregorio <[email protected]>
//		Miguel de Icaza <[email protected]>

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

namespace MonoTests.System.Linq.Expressions
{
	[TestFixture]
	[Category("SRE")]
	public class ExpressionTest_Power
	{
		[Test]
		[ExpectedException (typeof (ArgumentNullException))]
		public void Arg1Null ()
		{
			Expression.Power (null, Expression.Constant (1.0));
		}

		[Test]
		[ExpectedException (typeof (ArgumentNullException))]
		public void Arg2Null ()
		{
			Expression.Power (Expression.Constant (1.0), null);
		}

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

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

		[Test]
		[ExpectedException (typeof (InvalidOperationException))]
		public void ArgTypesFloat ()
		{
			Expression.Power (Expression.Constant ((float)1), Expression.Constant ((float)2));
		}

		[Test]
		public void ArgTypesDouble ()
		{
			var p = Expression.Power (Expression.Constant (1.0), Expression.Constant (2.0));

			Assert.AreEqual (ExpressionType.Power, p.NodeType, "Power#01");
			Assert.AreEqual (typeof (double), p.Type, "Add#02");
			Assert.AreEqual ("(1 ** 2)", p.ToString ());
		}

		[Test]
		public void TestCompile ()
		{
			var a = Expression.Parameter (typeof (double), "a");
			var b = Expression.Parameter (typeof (double), "b");

			var power = Expression.Lambda<Func<double,double,double>> (
				Expression.Power (a, b), a, b).Compile ();

			Assert.AreEqual (1, power (1, 10));
			Assert.AreEqual (16, power (2, 4));
		}

		[Test]
		public void NullablePower ()
		{
			var a = Expression.Parameter (typeof (double?), "a");
			var b = Expression.Parameter (typeof (double?), "b");

			var power = Expression.Lambda<Func<double?, double?, double?>> (
				Expression.Power (a, b), a, b).Compile ();

			Assert.AreEqual ((double?) 1, power (1, 10));
			Assert.AreEqual ((double?) 16, power (2, 4));
			Assert.AreEqual ((double?) null, power (1, null));
			Assert.AreEqual ((double?) null, power (null, 1));
			Assert.AreEqual ((double?) null, power (null, null));
		}
	}
}