Add code coverage for ListViewDesigner (#13301)

Related #10773

Author: Zheng-Li01

src/System.Windows.Forms.Design/tests/UnitTests/ListViewDesignerTests.cs

@@ -0,0 +1,134 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.ComponentModel.Design;
+using System.Drawing;
+
+namespace System.Windows.Forms.Design.Tests;
+
+public class ListViewDesignerTests : IDisposable
+{
+    private readonly ListViewDesigner _listViewDesigner;
+    private readonly ListView _listView;
+
+    public ListViewDesignerTests()
+    {
+        _listViewDesigner = new();
+        _listView = new();
+        _listViewDesigner.Initialize(_listView);
+    }
+
+    public void Dispose()
+    {
+        _listViewDesigner.Dispose();
+        _listView.Dispose();
+    }
+
+    [WinFormsFact]
+    public void ListViewDesigner_AssociatedComponentsTest()
+    {
+        _listView.Columns.Add("123");
+        _listView.Columns.Add("abc");
+
+        _listViewDesigner.AssociatedComponents.Count.Should().Be(2);
+    }
+
+    [WinFormsFact]
+    public void ListViewDesigner_GetHitTest_ReturnsFalse_WhenViewIsNotDetails()
+    {
+        _listView.View = View.LargeIcon;
+
+        bool result = _listViewDesigner.TestAccessor().Dynamic.GetHitTest(new Point(10, 10));
+
+        result.Should().BeFalse();
+    }
+
+    [WinFormsFact]
+    public void ListViewDesigner_GetHitTest_ReturnsFalse_WhenPointIsNotOnHeader()
+    {
+        _listView.View = View.Details;
+        _listView.Columns.Add("Column1");
+
+        bool result = _listViewDesigner.TestAccessor().Dynamic.GetHitTest(new Point(10, 10));
+
+        result.Should().BeFalse();
+    }
+
+    [WinFormsFact]
+    public void ListViewDesigner_GetHitTest_ReturnsFalse_WhenHeaderHandleIsNull()
+    {
+        _listView.View = View.Details;
+        _listView.Columns.Add("Column1");
+
+        Point point = new(10, 5);
+        bool result = _listViewDesigner.TestAccessor().Dynamic.GetHitTest(point);
+
+        result.Should().BeFalse();
+    }
+
+    [WinFormsFact]
+    public void ListViewDesigner_GetHitTest_ReturnsFalse_WhenPointIsOutsideControl()
+    {
+        _listView.View = View.Details;
+        _listView.Columns.Add("Column1");
+
+        Point outsidePoint = new(-10, -10);
+        bool result = _listViewDesigner.TestAccessor().Dynamic.GetHitTest(outsidePoint);
+
+        result.Should().BeFalse();
+    }
+
+    [WinFormsFact]
+    public void ListViewDesigner_Initialize_SetsOwnerDrawToFalse() =>
+    _listView.OwnerDraw.Should().BeFalse();
+
+    [WinFormsFact]
+    public void ListViewDesigner_Initialize_SetsUseCompatibleStateImageBehaviorToFalse() =>
+        _listView.UseCompatibleStateImageBehavior.Should().BeFalse();
+
+    [WinFormsFact]
+    public void ListViewDesigner_Initialize_HooksChildHandles_WhenViewIsDetails()
+    {
+        _listView.View = View.Details;
+
+        _listViewDesigner.Should().BeOfType<ListViewDesigner>();
+    }
+
+    [WinFormsFact]
+    public void ListViewDesigner_Initialize_DoesNotHookChildHandles_WhenViewIsNotDetails()
+    {
+        _listView.View = View.LargeIcon;
+
+        _listViewDesigner.Should().BeOfType<ListViewDesigner>();
+    }
+
+    [WinFormsFact]
+    public void ListViewDesigner_ActionLists_ReturnsNonNullCollection()
+    {
+        DesignerActionListCollection actionLists = _listViewDesigner.ActionLists;
+
+        actionLists.Should().BeOfType<DesignerActionListCollection>();
+        actionLists[0].Should().BeOfType<ListViewActionList>();
+    }
+
+    [WinFormsFact]
+    public void ListViewDesigner_ActionLists_ReturnsSameInstanceOnSubsequentCalls()
+    {
+        DesignerActionListCollection firstCall = _listViewDesigner.ActionLists;
+        DesignerActionListCollection secondCall = _listViewDesigner.ActionLists;
+
+        firstCall.Should().BeSameAs(secondCall);
+    }
+
+    [WinFormsFact]
+    public void ListViewDesigner_ActionLists_ThreadSafeInitialization()
+    {
+        DesignerActionListCollection[] results = new DesignerActionListCollection[2];
+        Parallel.Invoke(
+            () => results[0] = _listViewDesigner.ActionLists,
+            () => results[1] = _listViewDesigner.ActionLists
+        );
+
+        results[0].Should().BeSameAs(results[1]);
+    }
+}