Add code coverage for DataGridViewImageCell

src/test/unit/System.Windows.Forms/System/Windows/Forms/DataGridViewImageCellTests.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Drawing;
+
+namespace System.Windows.Forms.Tests;
+
+public class DataGridViewImageCellTests : IDisposable
+{
+    private readonly DataGridViewImageCell _dataGridViewImageCell;
+
+    public DataGridViewImageCellTests() => _dataGridViewImageCell = new();
+
+    public void Dispose() => _dataGridViewImageCell.Dispose();
+
+    [Fact]
+    public void Ctor_Default_SetsValueIsIconFalse() =>
+        _dataGridViewImageCell.ValueIsIcon.Should().BeFalse();
+
+    [WinFormsTheory]
+    [BoolData]
+    public void Ctor_ValueIsIcon_SetsValueIsIcon(bool valueIsIcon)
+    {
+        using DataGridViewImageCell dataGridViewImageCell = new(valueIsIcon);
+
+        dataGridViewImageCell.ValueIsIcon.Should().Be(valueIsIcon);
+    }
+
+    [Fact]
+    public void DefaultNewRowValue_ReturnsErrorBitmap_WhenValueTypeIsImage()
+    {
+        _dataGridViewImageCell.ValueType = typeof(Image);
+        var value = _dataGridViewImageCell.DefaultNewRowValue;
+
+        value.Should().BeSameAs(DataGridViewImageCell.ErrorBitmap);
+    }
+
+    [WinFormsFact]
+    public void DefaultNewRowValue_ReturnsNull_WhenValueTypeIsOther()
+    {
+        _dataGridViewImageCell.ValueType = typeof(string);
+        _dataGridViewImageCell.ValueIsIcon = false;
+        object? value = _dataGridViewImageCell.DefaultNewRowValue;
+
+        value.Should().BeNull();
+    }
+
+    [Fact]
+    public void EditType_IsAlwaysNull()
+    {
+        _dataGridViewImageCell.EditType.Should().BeNull();
+
+        using DataGridViewImageCell dataGridViewImageCellIcon = new(true);
+        dataGridViewImageCellIcon.EditType.Should().BeNull();
+    }
+
+    [WinFormsFact]
+    public void FormattedValueType_ReturnsImage_WhenValueIsIconFalse()
+    {
+        _dataGridViewImageCell.ValueIsIcon = false;
+        _dataGridViewImageCell.FormattedValueType.Should().Be(typeof(Image));
+    }
+
+    [WinFormsFact]
+    public void ValueIsIcon_SetFalse_UpdatesFlag()
+    {
+        _dataGridViewImageCell.ValueIsIcon = true;
+        _dataGridViewImageCell.ValueIsIcon = false;
+        _dataGridViewImageCell.ValueIsIcon.Should().BeFalse();
+    }
+
+    [Fact]
+    public void ValueType_GetSet_RoundTrips()
+    {
+        _dataGridViewImageCell.ValueType = typeof(Image);
+        _dataGridViewImageCell.ValueType.Should().Be(typeof(Image));
+
+        _dataGridViewImageCell.ValueType = null;
+        _dataGridViewImageCell.ValueType.Should().Be(typeof(Image));
+
+        _dataGridViewImageCell.ValueIsIcon = true;
+        _dataGridViewImageCell.ValueType.Should().Be(typeof(Icon));
+    }
+
+    [Fact]
+    public void ValueType_SetToNull_ResetsValueIsIconToDefault()
+    {
+        _dataGridViewImageCell.ValueType = typeof(Icon);
+        _dataGridViewImageCell.ValueIsIcon.Should().BeTrue();
+
+        _dataGridViewImageCell.ValueType = null;
+        _dataGridViewImageCell.ValueIsIcon.Should().BeFalse();
+    }
+
+    [Fact]
+    public void GetContentBounds_ReturnsEmpty_WhenDataGridViewIsNull()
+    {
+        using Graphics g = Graphics.FromImage(new Bitmap(10, 10));
+        DataGridViewCellStyle dataGridViewCellStyle = new();
+        _dataGridViewImageCell.DataGridView = null;
+        Rectangle bounds = (Rectangle)_dataGridViewImageCell.TestAccessor().Dynamic.GetContentBounds(g, dataGridViewCellStyle, 0);
+
+        bounds.Should().Be(Rectangle.Empty);
+    }
+
+    [WinFormsFact]
+    public void GetContentBounds_ReturnsEmpty_WhenRowIndexNegative()
+    {
+        using DataGridView dataGridView = new();
+        _dataGridViewImageCell.DataGridView = dataGridView;
+        using Graphics g = Graphics.FromImage(new Bitmap(10, 10));
+        DataGridViewCellStyle dataGridViewCellStyle = new();
+        Rectangle bounds = (Rectangle)_dataGridViewImageCell.TestAccessor().Dynamic.GetContentBounds(g, dataGridViewCellStyle, -1);
+
+        bounds.Should().Be(Rectangle.Empty);
+    }
+
+    [WinFormsFact]
+    public void GetContentBounds_ReturnsEmpty_WhenOwningColumnIsNull()
+    {
+        using DataGridView dataGridView = new();
+        dataGridView.Columns.Add(new DataGridViewImageColumn());
+        dataGridView.Rows.Add();
+        _dataGridViewImageCell.DataGridView = dataGridView;
+        _dataGridViewImageCell.OwningColumn = null;
+        using Graphics g = Graphics.FromImage(new Bitmap(10, 10));
+        DataGridViewCellStyle dataGridViewCellStyle = new();
+        Rectangle bounds = (Rectangle)_dataGridViewImageCell.TestAccessor().Dynamic.GetContentBounds(g, dataGridViewCellStyle, 0);
+
+        bounds.Should().Be(Rectangle.Empty);
+    }
+
+    [Fact]
+    public void GetErrorIconBounds_ReturnsEmpty_WhenDataGridViewIsNull()
+    {
+        using Graphics g = Graphics.FromImage(new Bitmap(10, 10));
+        DataGridViewCellStyle dataGridViewCellStyle = new();
+        Rectangle bounds = (Rectangle)_dataGridViewImageCell.TestAccessor().Dynamic.GetErrorIconBounds(g, dataGridViewCellStyle, 0);
+
+        bounds.Should().Be(Rectangle.Empty);
+    }
+
+    [WinFormsFact]
+    public void GetErrorIconBounds_ReturnsEmpty_WhenRowIndexNegative()
+    {
+        using DataGridView dataGridView = new();
+        dataGridView.Columns.Add(new DataGridViewImageColumn());
+        dataGridView.Rows.Add();
+        _dataGridViewImageCell.DataGridView = dataGridView;
+        using Graphics g = Graphics.FromImage(new Bitmap(10, 10));
+        DataGridViewCellStyle dataGridViewCellStyle = new();
+        Rectangle bounds = (Rectangle)_dataGridViewImageCell.TestAccessor().Dynamic.GetErrorIconBounds(g, dataGridViewCellStyle, -1);
+
+        bounds.Should().Be(Rectangle.Empty);
+    }
+
+    [WinFormsFact]
+    public void GetErrorIconBounds_ReturnsEmpty_WhenOwningColumnIsNull()
+    {
+        using DataGridView dataGridView = new();
+        dataGridView.Columns.Add(new DataGridViewImageColumn());
+        dataGridView.Rows.Add();
+        _dataGridViewImageCell.DataGridView = dataGridView;
+        _dataGridViewImageCell.OwningColumn = null;
+        using Graphics g = Graphics.FromImage(new Bitmap(10, 10));
+        DataGridViewCellStyle dataGridViewCellStyle = new();
+        Rectangle bounds = (Rectangle)_dataGridViewImageCell.TestAccessor().Dynamic.GetErrorIconBounds(g, dataGridViewCellStyle, 0);
+
+        bounds.Should().Be(Rectangle.Empty);
+    }
+
+    [WinFormsFact]
+    public void GetErrorIconBounds_ReturnsEmpty_WhenShowCellErrorsIsFalse()
+    {
+        using DataGridView dataGridView = new();
+        using DataGridViewImageColumn dataGridViewImageColumn = new();
+        dataGridView.Columns.Add(dataGridViewImageColumn);
+        dataGridView.Rows.Add();
+        dataGridView.ShowCellErrors = false;
+        _dataGridViewImageCell.DataGridView = dataGridView;
+        using Graphics g = Graphics.FromImage(new Bitmap(10, 10));
+        DataGridViewCellStyle dataGridViewCellStyle = new();
+        Rectangle bounds = (Rectangle)_dataGridViewImageCell.TestAccessor().Dynamic.GetErrorIconBounds(g, dataGridViewCellStyle, 0);
+
+        bounds.Should().Be(Rectangle.Empty);
+    }
+
+    [WinFormsFact]
+    public void GetErrorIconBounds_ReturnsEmpty_WhenErrorTextIsNullOrEmpty()
+    {
+        using DataGridView dataGridView = new();
+        using DataGridViewImageColumn dataGridViewImageColumn = new();
+        dataGridView.Columns.Add(dataGridViewImageColumn);
+        dataGridView.Rows.Add();
+        dataGridView.ShowCellErrors = true;
+        _dataGridViewImageCell.DataGridView = dataGridView;
+        _dataGridViewImageCell.ErrorText = null;
+        _dataGridViewImageCell.OwningColumn = null;
+        using Graphics g = Graphics.FromImage(new Bitmap(10, 10));
+        DataGridViewCellStyle dataGridViewCellStyle = new();
+        Rectangle bounds = (Rectangle)_dataGridViewImageCell.TestAccessor().Dynamic.GetErrorIconBounds(g, dataGridViewCellStyle, 0);
+
+        bounds.Should().Be(Rectangle.Empty);
+    }
+
+    [Fact]
+    public void GetPreferredSize_ReturnsMinusOne_WhenDataGridViewIsNull()
+    {
+        using DataGridViewImageCell dataGridViewImageCell = _dataGridViewImageCell;
+        using Graphics g = Graphics.FromImage(new Bitmap(10, 10));
+        DataGridViewCellStyle dataGridViewCellStyle = new();
+        Size size = (Size)dataGridViewImageCell.TestAccessor().Dynamic.GetPreferredSize(g, dataGridViewCellStyle, 0, new Size(100, 100));
+
+        size.Should().Be(new Size(-1, -1));
+    }
+
+    [Fact]
+    public void GetPreferredSize_ThrowsNullReferenceException_WhenCellStyleIsNull()
+    {
+        using DataGridViewImageCell dataGridViewImageCell = _dataGridViewImageCell;
+        using Graphics g = Graphics.FromImage(new Bitmap(10, 10));
+        Action action = () => dataGridViewImageCell.TestAccessor().Dynamic.GetPreferredSize(g, null, 0, new Size(100, 100));
+
+        action.Should().Throw<NullReferenceException>();
+    }
+
+    [WinFormsFact]
+    public void Paint_DoesNotThrow_WithValidArguments_UsingTestAccessor()
+    {
+        using DataGridView dataGridView = new();
+        using DataGridViewImageColumn dataGridViewImageColumn = new();
+        dataGridView.Columns.Add(dataGridViewImageColumn);
+        dataGridView.Rows.Add();
+        using DataGridViewImageCell dataGridViewImageCell = _dataGridViewImageCell;
+        dataGridView.Rows[0].Cells[0] = dataGridViewImageCell;
+        using Graphics g = Graphics.FromImage(new Bitmap(10, 10));
+        DataGridViewCellStyle dataGridViewCellStyle = new();
+        DataGridViewAdvancedBorderStyle borderStyle = new();
+
+        Action action = () => dataGridViewImageCell.TestAccessor().Dynamic.Paint(
+        g,
+        new Rectangle(0, 0, 10, 10),
+        new Rectangle(0, 0, 10, 10),
+        0,
+        DataGridViewElementStates.None,
+        null,
+        null,
+        null,
+        dataGridViewCellStyle,
+        borderStyle,
+        DataGridViewPaintParts.All);
+
+        action.Should().NotThrow();
+    }
+
+    [WinFormsFact]
+    public void ColumnIndex_ReturnsExpectedFormat()
+    {
+        using DataGridView dataGridView = new();
+        dataGridView.Columns.Add(new DataGridViewImageColumn());
+        dataGridView.Rows.Add();
+        using DataGridViewImageCell dataGridViewImageCell = _dataGridViewImageCell;
+        dataGridView.Rows[0].Cells[0] = dataGridViewImageCell;
+
+        dataGridViewImageCell.ColumnIndex.Should().Be(0);
+    }
+}