Code
  [SetUp]
        public void ShowForm()
        {
            form = new Form();
            list = new ListControl();

            list.Visible = true;
            list.Dock = DockStyle.Fill;

            form.Controls.Add(list);
            form.Show();
        }

        [TearDown]
        public void CloseForm()
        {
            form.Close();
            form = null;
        }

        [Test]
        public void AddFilters()
        {
            IListFilters filters = list;

            filters.Add("Bar1", new Filter("Bar1_F1", "Bar1 = true", "Bar1"));
            filters.Add("Bar1", new Filter("Bar1_F1", "Bar1 = false", "Bar1"));

            Assert.AreEqual(1, list.UT_ToolStripPanel.Controls.Count);
            ToolStrip strip = (ToolStrip)list.UT_ToolStripPanel.Controls[0];
            Assert.AreEqual(2, strip.Items.Count);
            Assert.AreEqual(strip.Items[0].GetType(), typeof(ToolStripLabel));
            Assert.AreEqual(strip.Items[1].GetType(), typeof(ToolStripComboBox));
        }