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 *     following disclaimer. 
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using System.ComponentModel;
using NUnit.Framework;
using XenAdmin.Controls.DataGridViewEx;

namespace XenAdminTests.UnitTests.Dialogs.DataGridViewEx
{
    [TestFixture, NUnit.Framework.Category(TestCategories.Unit)]
    public class CollapsingPoolHostDataGridViewRowSorterTests
    {
        private class TestRow : PoolHostDataGridViewOneCheckboxRow
        {
        }

        private class TestSorter : CollapsingPoolHostDataGridViewRowSorter
        {
            private readonly int sortValueToReturn;

            public TestSorter(ListSortDirection direction, int sortValueToReturn) : base(direction)
            {
                this.sortValueToReturn = sortValueToReturn;
            }

            public TestSorter(int sortValueToReturn) : base()
            {
                this.sortValueToReturn = sortValueToReturn;
            }

            protected override int PerformSort()
            {
                return sortValueToReturn;
            }
        }

        [Test]
        public void TestDirectionConstructorAscending()
        {
            TestSorter sorter = new TestSorter(ListSortDirection.Ascending, 3);
            Assert.AreEqual(3, sorter.Compare(new TestRow(), new TestRow()));
        }

        [Test]
        public void TestDirectionConstructorDescending()
        {
            TestSorter sorter = new TestSorter(ListSortDirection.Descending, 3);
            Assert.AreEqual(-3, sorter.Compare(new TestRow(), new TestRow()));
        }

        [Test]
        public void TestDefaultConstructorUsesAscending()
        {
            TestSorter sorter = new TestSorter(3);
            Assert.AreEqual(3, sorter.Compare(new TestRow(), new TestRow()));
        }

        [Test]
        public void TestNullsInComparisonReturnOne()
        {
            TestSorter sorter = new TestSorter(3);
            Assert.AreEqual(3, sorter.Compare(new TestRow(), new TestRow()));
            Assert.AreEqual(1, sorter.Compare(null, new TestRow()));
            Assert.AreEqual(1, sorter.Compare(new TestRow(), null));
            Assert.AreEqual(1, sorter.Compare(null, null));
        }
    }
}