xenadmin/XenAdminTests/TreeTests/MultiSelectTreeViewTests.cs

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using System;
using NUnit.Framework;
using XenAdmin.Controls;


namespace XenAdminTests.TreeTests
{
    [TestFixture, Category(TestCategories.Unit)]
    public class MultiSelectTreeViewTests
    {
        private MultiSelectTreeView _tv;

        [SetUp]
        public void Setup()
        {
            _tv = new MultiSelectTreeView();

            // ensure handle is created. Some tests fail if you don't do this.
           Assert.NotNull(_tv.Handle);
        }

        [TearDown]
        public void TearDown()
        {
            if (_tv != null)
                _tv.Dispose();
        }

        /// <summary>
        /// Tests that the SetContents method fires only once even when a complex change takes place in the
        /// selected nodes collection.
        /// </summary>
        [Test]
        public void TestSetContents()
        {
            int count = 0;

            EventHandler handler = delegate
            {
                count++;
            };

            _tv.SelectionsChanged += handler;
            
            try
            {
                _tv.Nodes.Add(new MultiSelectTreeNode("0"));
                _tv.Nodes.Add(new MultiSelectTreeNode("1"));
                _tv.SelectedNodes.SetContents(new [] { _tv.Nodes[0], _tv.Nodes[1] });
                
                Assert.AreEqual(1, count, "SelectionsChanged should only have fired once");

                _tv.Nodes.Add(new MultiSelectTreeNode("2"));
                _tv.Nodes.Add(new MultiSelectTreeNode("3"));
                
                _tv.SelectedNodes.SetContents(new [] { _tv.Nodes[2], _tv.Nodes[3] });
                Assert.AreEqual(2, count, "SelectionsChanged should only have fired twice");
            }
            finally
            {
                _tv.SelectionsChanged -= handler;
            }
        }
    }
}