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using System.Collections;
using Moq;
using NUnit.Framework;
using XenAdmin.Controls.DataGridViewEx;

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

        private class TestSorter : CollapsingPoolHostDataGridViewRowStableSorter<TestRow>
        {
            private readonly int returnValue;
            public TestSorter(int valueToReturn)
            {
                returnValue = valueToReturn;
            }
            protected override int SortRowByColumnDetails(TestRow rowLhs, TestRow rowRhs)
            {
                return returnValue;
            }
        }

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

        [Test]
        public void OneResultDoNotCallStableSorter()
        {
            TestSorter s = new TestSorter(1);
            var mock = new Mock<IComparer>(MockBehavior.Strict);
            s.StableSorter = mock.Object;
            Assert.AreEqual(1, s.Compare(new TestRow(), new TestRow()));
            mock.Verify(m => m.Compare(It.IsAny<TestRow>(), It.IsAny<TestRow>()), Times.Never());
        }

        [Test]
        public void MinusOneResultDoNotCallStableSorter()
        {
            TestSorter s = new TestSorter(-1);
            var mock = new Mock<IComparer>(MockBehavior.Strict);
            s.StableSorter = mock.Object;
            Assert.AreEqual(-1, s.Compare(new TestRow(), new TestRow()));
            mock.Verify(m => m.Compare(It.IsAny<TestRow>(), It.IsAny<TestRow>()), Times.Never());
        }

        [Test]
        public void ZeroResultDoesCallStableSorterAndReturnsTheStableSorterValue()
        {
            TestSorter s = new TestSorter(0);
            var mock = new Mock<IComparer>(MockBehavior.Strict);
            mock.Setup(m => m.Compare(It.IsAny<TestRow>(), It.IsAny<TestRow>())).Returns(3);
            s.StableSorter = mock.Object;
            Assert.AreEqual(3, s.Compare(new TestRow(), new TestRow()));
            mock.Verify(m => m.Compare(It.IsAny<TestRow>(), It.IsAny<TestRow>()), Times.Once());
        }
    }
}
