CollectionViewBaseTests.cs

using NUnit.Framework;

public abstract class CollectionViewBaseTests
{
    // abstract factory method
    public abstract CollectionViewBase GetView();

    [Test]
    public void HasDisposableEditorManager()
    {
        using (var view = GetView())
        {
            Assert.IsInstanceOf<DisposableEditorManager>(view.EditorManager);
        }
    }

    [Test]
    public void Dispose_DisposesOfEditorManager()
    {
        var view = GetView();
        bool disposed = false;
        view.EditorManager.Disposed += (o, args) => disposed = true;
        view.Dispose();
        Assert.True(disposed);
    }
}

FooCollectionViewerTests.cs

using NUnit.Framework;

[TestFixture]
public class FooCollectionViewerTest : CollectionViewBaseTests
{
    // overriden factory method
    public override CollectionViewBase GetView()
    {
        return new FooCollectionViewer();
    }

    // FooCollectionViewer specific tests follow
}

ZiffCollectionViewerTests.cs

using NUnit.Framework;

[TestFixture]
public class ZiffCollectionViewerTest : CollectionViewBaseTests
{
    // overriden factory method
    public override CollectionViewBase GetView()
    {
        return new ZiffCollectionViewer();
    }

    // ZiffCollectionViewer specific tests follow
}