// 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;
using System.Drawing;
using Point = System.Drawing.Point;
using Size = System.Drawing.Size;

namespace System.Windows.Forms.Tests;

public class SplitterPanelTests
{
    public static IEnumerable<object[]> Ctor_SplitContainer_TestData()
    {
        yield return new object[] { null };
        yield return new object[] { new SplitContainer() };
    }

    [WinFormsTheory]
    [MemberData(nameof(Ctor_SplitContainer_TestData))]
    public void SplitterPanel_Ctor_SplitContainer(SplitContainer owner)
    {
        using SplitterPanel control = new(owner);
        Assert.Null(control.AccessibleDefaultActionDescription);
        Assert.Null(control.AccessibleDescription);
        Assert.Null(control.AccessibleName);
        Assert.Equal(AccessibleRole.Default, control.AccessibleRole);
        Assert.False(control.AllowDrop);
        Assert.Equal(AnchorStyles.Top | AnchorStyles.Left, control.Anchor);
        Assert.False(control.AutoScroll);
        Assert.Equal(Size.Empty, control.AutoScrollMargin);
        Assert.Equal(Size.Empty, control.AutoScrollMinSize);
        Assert.Equal(Point.Empty, control.AutoScrollPosition);
        Assert.False(control.AutoSize);
        Assert.Equal(AutoSizeMode.GrowOnly, control.AutoSizeMode);
        Assert.Equal(Control.DefaultBackColor, control.BackColor);
        Assert.Null(control.BackgroundImage);
        Assert.Equal(ImageLayout.Tile, control.BackgroundImageLayout);
        Assert.Null(control.BindingContext);
        Assert.Equal(BorderStyle.None, control.BorderStyle);
        Assert.Equal(100, control.Bottom);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.Bounds);
        Assert.False(control.CanFocus);
        Assert.False(control.CanSelect);
        Assert.False(control.Capture);
        Assert.True(control.CausesValidation);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.ClientRectangle);
        Assert.Equal(new Size(200, 100), control.ClientSize);
        Assert.Null(control.Container);
        Assert.False(control.ContainsFocus);
        Assert.Null(control.ContextMenuStrip);
        Assert.Empty(control.Controls);
        Assert.Same(control.Controls, control.Controls);
        Assert.False(control.Created);
        Assert.Equal(Cursors.Default, control.Cursor);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.DisplayRectangle);
        Assert.Equal(DockStyle.None, control.Dock);
        Assert.NotNull(control.DockPadding);
        Assert.Same(control.DockPadding, control.DockPadding);
        Assert.Equal(0, control.DockPadding.Top);
        Assert.Equal(0, control.DockPadding.Bottom);
        Assert.Equal(0, control.DockPadding.Left);
        Assert.Equal(0, control.DockPadding.Right);
        Assert.True(control.Enabled);
        Assert.False(control.Focused);
        Assert.Equal(Control.DefaultFont, control.Font);
        Assert.Equal(Control.DefaultForeColor, control.ForeColor);
        Assert.False(control.HasChildren);
        Assert.Equal(100, control.Height);
        Assert.NotNull(control.HorizontalScroll);
        Assert.Same(control.HorizontalScroll, control.HorizontalScroll);
        Assert.Equal(ImeMode.NoControl, control.ImeMode);
        Assert.False(control.IsAccessible);
        Assert.False(control.IsMirrored);
        Assert.NotNull(control.LayoutEngine);
        Assert.Same(control.LayoutEngine, control.LayoutEngine);
        Assert.Equal(0, control.Left);
        Assert.Equal(Point.Empty, control.Location);
        Assert.Equal(Padding.Empty, control.Margin);
        Assert.Equal(Size.Empty, control.MaximumSize);
        Assert.Equal(Size.Empty, control.MinimumSize);
        Assert.Equal(Padding.Empty, control.Padding);
        Assert.Null(control.Parent);
        Assert.Equal(Size.Empty, control.PreferredSize);
        Assert.Equal("Microsoft\u00AE .NET", control.ProductName);
        Assert.False(control.RecreatingHandle);
        Assert.Null(control.Region);
        Assert.Equal(200, control.Right);
        Assert.Equal(RightToLeft.No, control.RightToLeft);
        Assert.Equal(new Size(200, 100), control.Size);
        Assert.Equal(0, control.TabIndex);
        Assert.False(control.TabStop);
        Assert.Empty(control.Text);
        Assert.Equal(0, control.Top);
        Assert.Null(control.TopLevelControl);
        Assert.False(control.UseWaitCursor);
        Assert.True(control.Visible);
        Assert.NotNull(control.VerticalScroll);
        Assert.Same(control.VerticalScroll, control.VerticalScroll);
        Assert.Equal(200, control.Width);

        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [MemberData(nameof(ControlTests.Anchor_Set_TestData), MemberType = typeof(ControlTests))]
    public void SplitterPanel_Anchor_Set_GetReturnsExpected(AnchorStyles value, AnchorStyles expected)
    {
        using SplitterPanel control = new(null)
        {
            Anchor = value
        };
        Assert.Equal(expected, control.Anchor);
        Assert.Equal(DockStyle.None, control.Dock);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.Anchor = value;
        Assert.Equal(expected, control.Anchor);
        Assert.Equal(DockStyle.None, control.Dock);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [BoolData]
    public void SplitterPanel_AutoSize_Set_GetReturnsExpected(bool value)
    {
        using SplitterPanel control = new(null);
        int layoutCallCount = 0;
        control.Layout += (sender, e) => layoutCallCount++;

        control.AutoSize = value;
        Assert.Equal(value, control.AutoSize);
        Assert.Equal(0, layoutCallCount);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.AutoSize = value;
        Assert.Equal(value, control.AutoSize);
        Assert.Equal(0, layoutCallCount);
        Assert.False(control.IsHandleCreated);

        // Set different.
        control.AutoSize = !value;
        Assert.Equal(!value, control.AutoSize);
        Assert.Equal(0, layoutCallCount);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void SplitterPanel_AutoSize_SetWithHandler_CallsAutoSizeChanged()
    {
        using SplitterPanel control = new(null)
        {
            AutoSize = true
        };
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            callCount++;
        };
        control.AutoSizeChanged += handler;

        // Set different.
        control.AutoSize = false;
        Assert.False(control.AutoSize);
        Assert.Equal(1, callCount);

        // Set same.
        control.AutoSize = false;
        Assert.False(control.AutoSize);
        Assert.Equal(1, callCount);

        // Set different.
        control.AutoSize = true;
        Assert.True(control.AutoSize);
        Assert.Equal(2, callCount);

        // Remove handler.
        control.AutoSizeChanged -= handler;
        control.AutoSize = false;
        Assert.False(control.AutoSize);
        Assert.Equal(2, callCount);
    }

    [WinFormsTheory]
    [EnumData<AutoSizeMode>]
    [InvalidEnumData<AutoSizeMode>]
    public void SplitterPanel_AutoSizeMode_Set_GetReturnsExpected(AutoSizeMode value)
    {
        using SplitterPanel control = new(null);
        int layoutCallCount = 0;
        control.Layout += (sender, e) => layoutCallCount++;

        control.AutoSizeMode = value;
        Assert.Equal(AutoSizeMode.GrowOnly, control.AutoSizeMode);
        Assert.False(control.IsHandleCreated);
        Assert.Equal(0, layoutCallCount);

        // Set same.
        control.AutoSizeMode = value;
        Assert.Equal(AutoSizeMode.GrowOnly, control.AutoSizeMode);
        Assert.False(control.IsHandleCreated);
        Assert.Equal(0, layoutCallCount);
    }

    [WinFormsTheory]
    [EnumData<AutoSizeMode>]
    [InvalidEnumData<AutoSizeMode>]
    public void SplitterPanel_AutoSizeMode_SetWithParent_GetReturnsExpected(AutoSizeMode value)
    {
        using Control parent = new();
        using SplitterPanel control = new(null)
        {
            Parent = parent
        };
        int layoutCallCount = 0;
        control.Layout += (sender, e) => layoutCallCount++;
        int parentLayoutCallCount = 0;
        parent.Layout += (sender, e) => parentLayoutCallCount++;

        control.AutoSizeMode = value;
        Assert.Equal(AutoSizeMode.GrowOnly, control.AutoSizeMode);
        Assert.False(control.IsHandleCreated);
        Assert.Equal(0, layoutCallCount);
        Assert.False(parent.IsHandleCreated);
        Assert.Equal(0, parentLayoutCallCount);

        // Set same.
        control.AutoSizeMode = value;
        Assert.Equal(AutoSizeMode.GrowOnly, control.AutoSizeMode);
        Assert.False(control.IsHandleCreated);
        Assert.Equal(0, layoutCallCount);
        Assert.False(parent.IsHandleCreated);
        Assert.Equal(0, parentLayoutCallCount);
    }

    [WinFormsTheory]
    [EnumData<AutoSizeMode>]
    [InvalidEnumData<AutoSizeMode>]
    public void SplitterPanel_AutoSizeMode_SetWithHandle_GetReturnsExpected(AutoSizeMode value)
    {
        using SplitterPanel control = new(null);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        control.AutoSizeMode = value;
        Assert.Equal(AutoSizeMode.GrowOnly, control.AutoSizeMode);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Set same.
        control.AutoSizeMode = value;
        Assert.Equal(AutoSizeMode.GrowOnly, control.AutoSizeMode);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsTheory]
    [EnumData<AutoSizeMode>]
    [InvalidEnumData<AutoSizeMode>]
    public void SplitterPanel_AutoSizeMode_SetWithHandleWithParent_GetReturnsExpected(AutoSizeMode value)
    {
        using Control parent = new();
        using SplitterPanel control = new(null)
        {
            Parent = parent
        };
        Assert.NotEqual(IntPtr.Zero, parent.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;
        int layoutCallCount = 0;
        control.Layout += (sender, e) => layoutCallCount++;
        int parentInvalidatedCallCount = 0;
        parent.Invalidated += (sender, e) => parentInvalidatedCallCount++;
        int parentStyleChangedCallCount = 0;
        parent.StyleChanged += (sender, e) => parentStyleChangedCallCount++;
        int parentCreatedCallCount = 0;
        parent.HandleCreated += (sender, e) => parentCreatedCallCount++;
        int parentLayoutCallCount = 0;
        parent.Layout += (sender, e) => parentLayoutCallCount++;

        control.AutoSizeMode = value;
        Assert.Equal(AutoSizeMode.GrowOnly, control.AutoSizeMode);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
        Assert.Equal(0, layoutCallCount);
        Assert.True(parent.IsHandleCreated);
        Assert.Equal(0, parentInvalidatedCallCount);
        Assert.Equal(0, parentStyleChangedCallCount);
        Assert.Equal(0, parentCreatedCallCount);
        Assert.Equal(0, parentLayoutCallCount);

        // Set same.
        control.AutoSizeMode = value;
        Assert.Equal(AutoSizeMode.GrowOnly, control.AutoSizeMode);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
        Assert.Equal(0, layoutCallCount);
        Assert.True(parent.IsHandleCreated);
        Assert.Equal(0, parentInvalidatedCallCount);
        Assert.Equal(0, parentStyleChangedCallCount);
        Assert.Equal(0, parentCreatedCallCount);
        Assert.Equal(0, parentLayoutCallCount);
    }

    [WinFormsTheory]
    [EnumData<BorderStyle>]
    public void SplitterPanel_BorderStyle_Set_GetReturnsExpected(BorderStyle value)
    {
        using SplitterPanel control = new(null)
        {
            BorderStyle = value
        };
        Assert.Equal(value, control.BorderStyle);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.BorderStyle = value;
        Assert.Equal(value, control.BorderStyle);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [InlineData(BorderStyle.Fixed3D, 1)]
    [InlineData(BorderStyle.FixedSingle, 1)]
    [InlineData(BorderStyle.None, 0)]
    public void SplitterPanel_BorderStyle_SetWithHandle_GetReturnsExpected(BorderStyle value, int expectedInvalidatedCallCount)
    {
        using SplitterPanel control = new(null);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        control.BorderStyle = value;
        Assert.Equal(value, control.BorderStyle);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(expectedInvalidatedCallCount * 2, invalidatedCallCount);
        Assert.Equal(expectedInvalidatedCallCount, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Set same.
        control.BorderStyle = value;
        Assert.Equal(value, control.BorderStyle);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(expectedInvalidatedCallCount * 2, invalidatedCallCount);
        Assert.Equal(expectedInvalidatedCallCount, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsTheory]
    [InvalidEnumData<BorderStyle>]
    public void SplitterPanel_BorderStyle_SetInvalid_ThrowsInvalidEnumArgumentException(BorderStyle value)
    {
        using SplitterPanel control = new(null);
        Assert.Throws<InvalidEnumArgumentException>("value", () => control.BorderStyle = value);
    }

    [WinFormsTheory]
    [EnumData<DockStyle>]
    public void SplitterPanel_Dock_Set_GetReturnsExpected(DockStyle value)
    {
        using SplitterPanel control = new(null)
        {
            Dock = value
        };
        Assert.Equal(value, control.Dock);
        Assert.Equal(AnchorStyles.Top | AnchorStyles.Left, control.Anchor);

        // Set same.
        control.Dock = value;
        Assert.Equal(value, control.Dock);
        Assert.Equal(AnchorStyles.Top | AnchorStyles.Left, control.Anchor);
    }

    [WinFormsFact]
    public void SplitterPanel_Dock_SetWithHandler_CallsDockChanged()
    {
        using SplitterPanel control = new(null)
        {
            Dock = DockStyle.None
        };
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            callCount++;
        };
        control.DockChanged += handler;

        // Set different.
        control.Dock = DockStyle.Top;
        Assert.Equal(DockStyle.Top, control.Dock);
        Assert.Equal(1, callCount);

        // Set same.
        control.Dock = DockStyle.Top;
        Assert.Equal(DockStyle.Top, control.Dock);
        Assert.Equal(1, callCount);

        // Set different.
        control.Dock = DockStyle.Left;
        Assert.Equal(DockStyle.Left, control.Dock);
        Assert.Equal(2, callCount);

        // Remove handler.
        control.DockChanged -= handler;
        control.Dock = DockStyle.Top;
        Assert.Equal(DockStyle.Top, control.Dock);
        Assert.Equal(2, callCount);
    }

    [WinFormsTheory]
    [InvalidEnumData<DockStyle>]
    public void SplitterPanel_Dock_SetInvalid_ThrowsInvalidEnumArgumentException(DockStyle value)
    {
        using SplitterPanel control = new(null);
        Assert.Throws<InvalidEnumArgumentException>("value", () => control.Dock = value);
    }

    [WinFormsTheory]
    [InlineData(-4)]
    [InlineData(0)]
    [InlineData(2)]
    [InlineData(40)]
    public void SplitterPanel_Height_Set_ThrowsNotSupportedException(int value)
    {
        using SplitterPanel control = new(null);
        int layoutCallCount = 0;
        int resizeCallCount = 0;
        int sizeChangedCallCount = 0;
        int clientSizeChangedCallCount = 0;
        control.Layout += (sender, e) => layoutCallCount++;
        control.Resize += (sender, e) => resizeCallCount++;
        control.SizeChanged += (sender, e) => sizeChangedCallCount++;
        control.ClientSizeChanged += (sender, e) => clientSizeChangedCallCount++;

        Assert.Throws<NotSupportedException>(() => control.Height = value);
        Assert.Equal(new Size(200, 100), control.ClientSize);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.ClientRectangle);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.DisplayRectangle);
        Assert.Equal(new Size(200, 100), control.Size);
        Assert.Equal(0, control.Left);
        Assert.Equal(200, control.Right);
        Assert.Equal(0, control.Top);
        Assert.Equal(100, control.Bottom);
        Assert.Equal(200, control.Width);
        Assert.Equal(100, control.Height);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.Bounds);
        Assert.Equal(0, layoutCallCount);
        Assert.Equal(0, resizeCallCount);
        Assert.Equal(0, sizeChangedCallCount);
        Assert.Equal(0, clientSizeChangedCallCount);
        Assert.False(control.IsHandleCreated);

        // Call again.
        Assert.Throws<NotSupportedException>(() => control.Height = value);
        Assert.Equal(new Size(200, 100), control.ClientSize);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.ClientRectangle);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.DisplayRectangle);
        Assert.Equal(new Size(200, 100), control.Size);
        Assert.Equal(0, control.Left);
        Assert.Equal(200, control.Right);
        Assert.Equal(0, control.Top);
        Assert.Equal(100, control.Bottom);
        Assert.Equal(200, control.Width);
        Assert.Equal(100, control.Height);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.Bounds);
        Assert.Equal(0, layoutCallCount);
        Assert.Equal(0, resizeCallCount);
        Assert.Equal(0, sizeChangedCallCount);
        Assert.Equal(0, clientSizeChangedCallCount);
        Assert.False(control.IsHandleCreated);
    }

    public static IEnumerable<object[]> Location_Set_TestData()
    {
        yield return new object[] { new Point(0, 0), 0 };
        yield return new object[] { new Point(-1, -2), 1 };
        yield return new object[] { new Point(1, 0), 1 };
        yield return new object[] { new Point(0, 2), 1 };
        yield return new object[] { new Point(1, 2), 1 };
    }

    [WinFormsTheory]
    [MemberData(nameof(Location_Set_TestData))]
    public void SplitterPanel_Location_Set_GetReturnsExpected(Point value, int expectedLocationChangedCallCount)
    {
        using SplitterPanel control = new(null);
        int moveCallCount = 0;
        int locationChangedCallCount = 0;
        int layoutCallCount = 0;
        int resizeCallCount = 0;
        int sizeChangedCallCount = 0;
        int clientSizeChangedCallCount = 0;
        control.Move += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            Assert.Equal(locationChangedCallCount, moveCallCount);
            moveCallCount++;
        };
        control.LocationChanged += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            Assert.Equal(moveCallCount - 1, locationChangedCallCount);
            locationChangedCallCount++;
        };
        control.Layout += (sender, e) => layoutCallCount++;
        control.Resize += (sender, e) => resizeCallCount++;
        control.SizeChanged += (sender, e) => sizeChangedCallCount++;
        control.ClientSizeChanged += (sender, e) => clientSizeChangedCallCount++;

        control.Location = value;
        Assert.Equal(new Size(200, 100), control.ClientSize);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.ClientRectangle);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.DisplayRectangle);
        Assert.Equal(new Size(200, 100), control.Size);
        Assert.Equal(value.X, control.Left);
        Assert.Equal(value.X + 200, control.Right);
        Assert.Equal(value, control.Location);
        Assert.Equal(value.Y, control.Top);
        Assert.Equal(value.Y + 100, control.Bottom);
        Assert.Equal(200, control.Width);
        Assert.Equal(100, control.Height);
        Assert.Equal(new Rectangle(value.X, value.Y, 200, 100), control.Bounds);
        Assert.Equal(expectedLocationChangedCallCount, moveCallCount);
        Assert.Equal(expectedLocationChangedCallCount, locationChangedCallCount);
        Assert.Equal(0, layoutCallCount);
        Assert.Equal(0, resizeCallCount);
        Assert.Equal(0, sizeChangedCallCount);
        Assert.Equal(0, clientSizeChangedCallCount);
        Assert.False(control.IsHandleCreated);

        // Call again.
        control.Location = value;
        Assert.Equal(new Size(200, 100), control.ClientSize);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.ClientRectangle);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.DisplayRectangle);
        Assert.Equal(new Size(200, 100), control.Size);
        Assert.Equal(value.X, control.Left);
        Assert.Equal(value.X + 200, control.Right);
        Assert.Equal(value, control.Location);
        Assert.Equal(value.Y, control.Top);
        Assert.Equal(value.Y + 100, control.Bottom);
        Assert.Equal(200, control.Width);
        Assert.Equal(100, control.Height);
        Assert.Equal(new Rectangle(value.X, value.Y, 200, 100), control.Bounds);
        Assert.Equal(expectedLocationChangedCallCount, moveCallCount);
        Assert.Equal(expectedLocationChangedCallCount, locationChangedCallCount);
        Assert.Equal(0, layoutCallCount);
        Assert.Equal(0, resizeCallCount);
        Assert.Equal(0, sizeChangedCallCount);
        Assert.Equal(0, clientSizeChangedCallCount);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void SplitterPanel_Location_SetWithHandler_CallsLocationChanged()
    {
        using SplitterPanel control = new(null);
        int locationChangedCallCount = 0;
        EventHandler locationChangedHandler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            locationChangedCallCount++;
        };
        control.LocationChanged += locationChangedHandler;
        int moveCallCount = 0;
        EventHandler moveHandler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            moveCallCount++;
        };
        control.Move += moveHandler;

        // Set different.
        control.Location = new Point(1, 2);
        Assert.Equal(new Point(1, 2), control.Location);
        Assert.Equal(1, locationChangedCallCount);
        Assert.Equal(1, moveCallCount);

        // Set same.
        control.Location = new Point(1, 2);
        Assert.Equal(new Point(1, 2), control.Location);
        Assert.Equal(1, locationChangedCallCount);
        Assert.Equal(1, moveCallCount);

        // Set different x.
        control.Location = new Point(2, 2);
        Assert.Equal(new Point(2, 2), control.Location);
        Assert.Equal(2, locationChangedCallCount);
        Assert.Equal(2, moveCallCount);

        // Set different y.
        control.Location = new Point(2, 3);
        Assert.Equal(new Point(2, 3), control.Location);
        Assert.Equal(3, locationChangedCallCount);
        Assert.Equal(3, moveCallCount);

        // Remove handler.
        control.LocationChanged -= locationChangedHandler;
        control.Move -= moveHandler;
        control.Location = new Point(1, 2);
        Assert.Equal(new Point(1, 2), control.Location);
        Assert.Equal(3, locationChangedCallCount);
        Assert.Equal(3, moveCallCount);
    }

    [WinFormsTheory]
    [MemberData(nameof(ControlTests.MaximumSize_Set_TestData), MemberType = typeof(ControlTests))]
    public void SplitterPanel_MaximumSize_Set_GetReturnsExpected(Size value)
    {
        using SplitterPanel control = new(null)
        {
            Size = Size.Empty
        };
        int layoutCallCount = 0;
        control.Layout += (sender, e) => layoutCallCount++;

        control.MaximumSize = value;
        Assert.Equal(value, control.MaximumSize);
        Assert.Equal(Size.Empty, control.Size);
        Assert.Equal(0, layoutCallCount);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.MaximumSize = value;
        Assert.Equal(value, control.MaximumSize);
        Assert.Equal(Size.Empty, control.Size);
        Assert.Equal(0, layoutCallCount);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [MemberData(nameof(ControlTests.MinimumSize_Set_TestData), MemberType = typeof(ControlTests))]
    public void SplitterPanel_MinimumSize_Set_GetReturnsExpected(Size value, Size expectedSize, int expectedLayoutCallCount)
    {
        using SplitterPanel control = new(null)
        {
            Size = Size.Empty
        };
        int layoutCallCount = 0;
        control.Layout += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("Bounds", e.AffectedProperty);
            layoutCallCount++;
        };

        control.MinimumSize = value;
        Assert.Equal(value, control.MinimumSize);
        Assert.Equal(expectedSize, control.Size);
        Assert.Equal(expectedLayoutCallCount, layoutCallCount);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.MinimumSize = value;
        Assert.Equal(value, control.MinimumSize);
        Assert.Equal(expectedSize, control.Size);
        Assert.Equal(expectedLayoutCallCount, layoutCallCount);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [NormalizedStringData]
    public void SplitterPanel_Name_Set_GetReturnsExpected(string value, string expected)
    {
        using SplitterPanel control = new(null)
        {
            Name = value
        };
        Assert.Equal(expected, control.Name);
        Assert.False(control.IsHandleCreated);

        // Get again.
        control.Name = value;
        Assert.Equal(expected, control.Name);
        Assert.False(control.IsHandleCreated);
    }

    public static IEnumerable<object[]> Parent_Set_TestData()
    {
        yield return new object[] { null };
        yield return new object[] { new Control() };
        yield return new object[] { new Form() };
    }

    [WinFormsTheory]
    [MemberData(nameof(Parent_Set_TestData))]
    public void SplitterPanel_Parent_Set_GetReturnsExpected(Control value)
    {
        using SplitterPanel control = new(null)
        {
            Parent = value
        };
        Assert.Same(value, control.Parent);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.Parent = value;
        Assert.Same(value, control.Parent);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void SplitterPanel_Parent_SetWithHandler_CallsParentChanged()
    {
        using Control parent = new();
        using SplitterPanel control = new(null);
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            callCount++;
        };
        control.ParentChanged += handler;

        // Set different.
        control.Parent = parent;
        Assert.Same(parent, control.Parent);
        Assert.Equal(1, callCount);

        // Set same.
        control.Parent = parent;
        Assert.Same(parent, control.Parent);
        Assert.Equal(1, callCount);

        // Set null.
        control.Parent = null;
        Assert.Null(control.Parent);
        Assert.Equal(2, callCount);

        // Remove handler.
        control.ParentChanged -= handler;
        control.Parent = parent;
        Assert.Same(parent, control.Parent);
        Assert.Equal(2, callCount);
    }

    public static IEnumerable<object[]> Size_Set_TestData()
    {
        yield return new object[] { new Size(-3, -4), 1 };
        yield return new object[] { new Size(0, 0), 1 };
        yield return new object[] { new Size(1, 0), 1 };
        yield return new object[] { new Size(0, 2), 1 };
        yield return new object[] { new Size(30, 40), 1 };
        yield return new object[] { new Size(200, 100), 0 };
    }

    [WinFormsTheory]
    [MemberData(nameof(Size_Set_TestData))]
    public void SplitterPanel_Size_Set_GetReturnsExpected(Size value, int expectedLayoutCallCount)
    {
        using SplitterPanel control = new(null);
        int layoutCallCount = 0;
        int resizeCallCount = 0;
        int sizeChangedCallCount = 0;
        int clientSizeChangedCallCount = 0;
        control.Layout += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("Bounds", e.AffectedProperty);
            Assert.Equal(resizeCallCount, layoutCallCount);
            Assert.Equal(sizeChangedCallCount, layoutCallCount);
            Assert.Equal(clientSizeChangedCallCount, layoutCallCount);
            layoutCallCount++;
        };
        control.Resize += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            Assert.Equal(layoutCallCount - 1, resizeCallCount);
            Assert.Equal(sizeChangedCallCount, resizeCallCount);
            Assert.Equal(clientSizeChangedCallCount, resizeCallCount);
            resizeCallCount++;
        };
        control.SizeChanged += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            Assert.Equal(resizeCallCount - 1, sizeChangedCallCount);
            Assert.Equal(layoutCallCount - 1, sizeChangedCallCount);
            Assert.Equal(clientSizeChangedCallCount, sizeChangedCallCount);
            sizeChangedCallCount++;
        };
        control.ClientSizeChanged += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            Assert.Equal(resizeCallCount - 1, clientSizeChangedCallCount);
            Assert.Equal(layoutCallCount - 1, clientSizeChangedCallCount);
            Assert.Equal(sizeChangedCallCount - 1, clientSizeChangedCallCount);
            clientSizeChangedCallCount++;
        };

        control.Size = value;
        Assert.Equal(value, control.ClientSize);
        Assert.Equal(new Rectangle(0, 0, value.Width, value.Height), control.ClientRectangle);
        Assert.Equal(new Rectangle(0, 0, value.Width, value.Height), control.DisplayRectangle);
        Assert.Equal(value, control.Size);
        Assert.Equal(0, control.Left);
        Assert.Equal(value.Width, control.Right);
        Assert.Equal(0, control.Top);
        Assert.Equal(value.Height, control.Bottom);
        Assert.Equal(value.Width, control.Width);
        Assert.Equal(value.Height, control.Height);
        Assert.Equal(new Rectangle(0, 0, value.Width, value.Height), control.Bounds);
        Assert.Equal(expectedLayoutCallCount, layoutCallCount);
        Assert.Equal(expectedLayoutCallCount, resizeCallCount);
        Assert.Equal(expectedLayoutCallCount, sizeChangedCallCount);
        Assert.Equal(expectedLayoutCallCount, clientSizeChangedCallCount);
        Assert.False(control.IsHandleCreated);

        // Call again.
        control.Size = value;
        Assert.Equal(value, control.ClientSize);
        Assert.Equal(new Rectangle(0, 0, value.Width, value.Height), control.ClientRectangle);
        Assert.Equal(new Rectangle(0, 0, value.Width, value.Height), control.DisplayRectangle);
        Assert.Equal(value, control.Size);
        Assert.Equal(0, control.Left);
        Assert.Equal(value.Width, control.Right);
        Assert.Equal(0, control.Top);
        Assert.Equal(value.Height, control.Bottom);
        Assert.Equal(value.Width, control.Width);
        Assert.Equal(value.Height, control.Height);
        Assert.Equal(new Rectangle(0, 0, value.Width, value.Height), control.Bounds);
        Assert.Equal(expectedLayoutCallCount, layoutCallCount);
        Assert.Equal(expectedLayoutCallCount, resizeCallCount);
        Assert.Equal(expectedLayoutCallCount, sizeChangedCallCount);
        Assert.Equal(expectedLayoutCallCount, clientSizeChangedCallCount);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [InlineData(0)]
    [InlineData(1)]
    [InlineData(2)]
    public void SplitterPanel_TabIndex_Set_GetReturnsExpected(int value)
    {
        using SplitterPanel control = new(null)
        {
            TabIndex = value
        };
        Assert.Equal(value, control.TabIndex);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.TabIndex = value;
        Assert.Equal(value, control.TabIndex);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void SplitterPanel_TabIndex_SetWithHandler_CallsTabIndexChanged()
    {
        using SplitterPanel control = new(null)
        {
            TabIndex = 0
        };
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            callCount++;
        };
        control.TabIndexChanged += handler;

        // Set different.
        control.TabIndex = 1;
        Assert.Equal(1, control.TabIndex);
        Assert.Equal(1, callCount);

        // Set same.
        control.TabIndex = 1;
        Assert.Equal(1, control.TabIndex);
        Assert.Equal(1, callCount);

        // Set different.
        control.TabIndex = 2;
        Assert.Equal(2, control.TabIndex);
        Assert.Equal(2, callCount);

        // Remove handler.
        control.TabIndexChanged -= handler;
        control.TabIndex = 1;
        Assert.Equal(1, control.TabIndex);
        Assert.Equal(2, callCount);
    }

    [WinFormsFact]
    public void SplitterPanel_TabIndex_SetNegative_CallsArgumentOutOfRangeException()
    {
        using SplitterPanel control = new(null);
        Assert.Throws<ArgumentOutOfRangeException>("value", () => control.TabIndex = -1);
    }

    [WinFormsTheory]
    [BoolData]
    public void SplitterPanel_TabStop_Set_GetReturnsExpected(bool value)
    {
        using SplitterPanel control = new(null)
        {
            TabStop = value
        };
        Assert.Equal(value, control.TabStop);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.TabStop = value;
        Assert.Equal(value, control.TabStop);
        Assert.False(control.IsHandleCreated);

        // Set different.
        control.TabStop = value;
        Assert.Equal(value, control.TabStop);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [BoolData]
    public void SplitterPanel_TabStop_SetWithHandle_GetReturnsExpected(bool value)
    {
        using SplitterPanel control = new(null);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        control.TabStop = value;
        Assert.Equal(value, control.TabStop);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Set same.
        control.TabStop = value;
        Assert.Equal(value, control.TabStop);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Set different.
        control.TabStop = value;
        Assert.Equal(value, control.TabStop);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void SplitterPanel_TabStop_SetWithHandler_CallsTabStopChanged()
    {
        using SplitterPanel control = new(null)
        {
            TabStop = true
        };
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            callCount++;
        };
        control.TabStopChanged += handler;

        // Set different.
        control.TabStop = false;
        Assert.False(control.TabStop);
        Assert.Equal(1, callCount);

        // Set same.
        control.TabStop = false;
        Assert.False(control.TabStop);
        Assert.Equal(1, callCount);

        // Set different.
        control.TabStop = true;
        Assert.True(control.TabStop);
        Assert.Equal(2, callCount);

        // Remove handler.
        control.TabStopChanged -= handler;
        control.TabStop = false;
        Assert.False(control.TabStop);
        Assert.Equal(2, callCount);
    }

    [WinFormsTheory]
    [NormalizedStringData]
    public void SplitterPanel_Text_Set_GetReturnsExpected(string value, string expected)
    {
        using SplitterPanel control = new(null)
        {
            Text = value
        };
        Assert.Equal(expected, control.Text);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.Text = value;
        Assert.Equal(expected, control.Text);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [NormalizedStringData]
    public void SplitterPanel_Text_SetWithHandle_GetReturnsExpected(string value, string expected)
    {
        using SplitterPanel control = new(null);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        control.Text = value;
        Assert.Equal(expected, control.Text);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Set same.
        control.Text = value;
        Assert.Equal(expected, control.Text);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void SplitterPanel_Text_SetWithHandler_CallsTextChanged()
    {
        using SplitterPanel control = new(null);
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Equal(EventArgs.Empty, e);
            callCount++;
        };
        control.TextChanged += handler;

        // Set different.
        control.Text = "text";
        Assert.Equal("text", control.Text);
        Assert.Equal(1, callCount);

        // Set same.
        control.Text = "text";
        Assert.Equal("text", control.Text);
        Assert.Equal(1, callCount);

        // Set different.
        control.Text = null;
        Assert.Empty(control.Text);
        Assert.Equal(2, callCount);

        // Remove handler.
        control.TextChanged -= handler;
        control.Text = "text";
        Assert.Equal("text", control.Text);
        Assert.Equal(2, callCount);
    }

    [WinFormsTheory]
    [BoolData]
    public void SplitterPanel_Visible_Set_GetReturnsExpected(bool value)
    {
        using SplitterPanel control = new(null)
        {
            Visible = value
        };
        Assert.Equal(value, control.Visible);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.Visible = value;
        Assert.Equal(value, control.Visible);
        Assert.False(control.IsHandleCreated);

        // Set different.
        control.Visible = !value;
        Assert.Equal(!value, control.Visible);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void SplitterPanel_Visible_SetWithHandler_CallsVisibleChanged()
    {
        using SplitterPanel control = new(null)
        {
            Visible = true
        };
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            callCount++;
        };
        control.VisibleChanged += handler;

        // Set different.
        control.Visible = false;
        Assert.False(control.Visible);
        Assert.Equal(1, callCount);

        // Set same.
        control.Visible = false;
        Assert.False(control.Visible);
        Assert.Equal(1, callCount);

        // Set different.
        control.Visible = true;
        Assert.True(control.Visible);
        Assert.Equal(2, callCount);

        // Remove handler.
        control.VisibleChanged -= handler;
        control.Visible = false;
        Assert.False(control.Visible);
        Assert.Equal(2, callCount);
    }

    [WinFormsTheory]
    [InlineData(-4)]
    [InlineData(0)]
    [InlineData(2)]
    [InlineData(40)]
    public void SplitterPanel_Width_Set_ThrowsNotSupportedException(int value)
    {
        using SplitterPanel control = new(null);
        int layoutCallCount = 0;
        int resizeCallCount = 0;
        int sizeChangedCallCount = 0;
        int clientSizeChangedCallCount = 0;
        control.Layout += (sender, e) => layoutCallCount++;
        control.Resize += (sender, e) => resizeCallCount++;
        control.SizeChanged += (sender, e) => sizeChangedCallCount++;
        control.ClientSizeChanged += (sender, e) => clientSizeChangedCallCount++;

        Assert.Throws<NotSupportedException>(() => control.Width = value);
        Assert.Equal(new Size(200, 100), control.ClientSize);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.ClientRectangle);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.DisplayRectangle);
        Assert.Equal(new Size(200, 100), control.Size);
        Assert.Equal(0, control.Left);
        Assert.Equal(200, control.Right);
        Assert.Equal(0, control.Top);
        Assert.Equal(100, control.Bottom);
        Assert.Equal(200, control.Width);
        Assert.Equal(100, control.Height);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.Bounds);
        Assert.Equal(0, layoutCallCount);
        Assert.Equal(0, resizeCallCount);
        Assert.Equal(0, sizeChangedCallCount);
        Assert.Equal(0, clientSizeChangedCallCount);
        Assert.False(control.IsHandleCreated);

        // Call again.
        Assert.Throws<NotSupportedException>(() => control.Width = value);
        Assert.Equal(new Size(200, 100), control.ClientSize);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.ClientRectangle);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.DisplayRectangle);
        Assert.Equal(new Size(200, 100), control.Size);
        Assert.Equal(0, control.Left);
        Assert.Equal(200, control.Right);
        Assert.Equal(0, control.Top);
        Assert.Equal(100, control.Bottom);
        Assert.Equal(200, control.Width);
        Assert.Equal(100, control.Height);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.Bounds);
        Assert.Equal(0, layoutCallCount);
        Assert.Equal(0, resizeCallCount);
        Assert.Equal(0, sizeChangedCallCount);
        Assert.Equal(0, clientSizeChangedCallCount);
        Assert.False(control.IsHandleCreated);
    }
}
