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

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// without limitation the rights to use, copy, modify, merge, publish,
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// The above copyright notice and this permission notice shall be
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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//
// Authors:
//		Federico Di Gregorio <[email protected]>

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

namespace MonoTests.System.Linq.Expressions
{
	[TestFixture]
	public class ExpressionTest_Constant
	{
		[Test]
		[ExpectedException (typeof (ArgumentException))]
		public void Arg2NotNullable ()
		{
			Expression.Constant(null, typeof(int));
		}

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

		[Test]
		public void NullValue ()
		{
			ConstantExpression expr = Expression.Constant (null);
			Assert.AreEqual (ExpressionType.Constant, expr.NodeType, "Constant#01");
			Assert.IsNull (expr.Value, "Constant#02");
			Assert.AreEqual (typeof (object), expr.Type, "Constant#03");
			Assert.AreEqual ("null", expr.ToString(), "Constant#04");
		}

		[Test]
		public void NullableValue1 ()
		{
			ConstantExpression expr = Expression.Constant (null, typeof(int?));
			Assert.AreEqual (ExpressionType.Constant, expr.NodeType, "Constant#05");
			Assert.IsNull (expr.Value, "Constant#06");
			Assert.AreEqual (typeof (int?), expr.Type, "Constant#07");
			Assert.AreEqual ("null", expr.ToString(), "Constant#08");
		}

		[Test]
		public void NullableValue2 ()
		{
			ConstantExpression expr = Expression.Constant (1, typeof (int?));
			Assert.AreEqual (ExpressionType.Constant, expr.NodeType, "Constant#09");
			Assert.AreEqual (1, expr.Value, "Constant#10");
			Assert.AreEqual (typeof (int?), expr.Type, "Constant#11");
			Assert.AreEqual ("1", expr.ToString(), "Constant#12");
		}

		[Test]
		public void NullableValue3 ()
		{
			ConstantExpression expr = Expression.Constant ((int?)1);
			Assert.AreEqual (ExpressionType.Constant, expr.NodeType, "Constant#13");
			Assert.AreEqual (1, expr.Value, "Constant#14");
			Assert.AreEqual (typeof (int), expr.Type, "Constant#15");
			Assert.AreEqual ("1", expr.ToString(), "Constant#16");
		}

		[Test]
		public void IntegerValue ()
		{
			ConstantExpression expr = Expression.Constant (0);
			Assert.AreEqual (ExpressionType.Constant, expr.NodeType, "Constant#17");
			Assert.AreEqual (0, expr.Value, "Constant#18");
			Assert.AreEqual (typeof (int), expr.Type, "Constant#19");
			Assert.AreEqual ("0", expr.ToString(), "Constant#20");
		}

		[Test]
		public void StringValue ()
		{
			ConstantExpression expr = Expression.Constant ("a string");
			Assert.AreEqual (ExpressionType.Constant, expr.NodeType, "Constant#21");
			Assert.AreEqual ("a string", expr.Value, "Constant#22");
			Assert.AreEqual (typeof (string), expr.Type, "Constant#23");
			Assert.AreEqual ("\"a string\"", expr.ToString(), "Constant#24");
		}

		[Test]
		public void DateTimeValue ()
		{
			ConstantExpression expr = Expression.Constant (new DateTime(1971, 10, 19));
			Assert.AreEqual (ExpressionType.Constant, expr.NodeType, "Constant#25");
			Assert.AreEqual (new DateTime(1971, 10, 19), expr.Value, "Constant#26");
			Assert.AreEqual (typeof (DateTime), expr.Type, "Constant#27");
			Assert.AreEqual (new DateTime(1971, 10, 19).ToString(), expr.ToString(), "Constant#28");
		}

		[Test]
		public void UserClassValue ()
		{
			OpClass oc = new OpClass ();
			ConstantExpression expr = Expression.Constant (oc);
			Assert.AreEqual (ExpressionType.Constant, expr.NodeType, "Constant#29");
			Assert.AreEqual (oc, expr.Value, "Constant#30");
			Assert.AreEqual (typeof (OpClass), expr.Type, "Constant#31");
			Assert.AreEqual ("value(MonoTests.System.Linq.Expressions.OpClass)", expr.ToString(), "Constant#32");
		}

		[Test]
		[ExpectedException (typeof (ArgumentException))]
		public void TestInvalidCtor_1 ()
		{
			// null value, type == valuetype is invalid
			Expression.Constant (null, typeof (int));
		}

		[Test]
		[ExpectedException (typeof (ArgumentException))]
		public void TestInvalidCtor_2 ()
		{
			// type mismatch: int value, type == double 
			Expression.Constant (0, typeof (double));
		}
		
	}
}