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Add code coverage for DataGridViewComboBoxCell (#13654)
* Add code coverage for DataGridViewComboBoxCell * Address FeedBacks
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‎src/test/unit/System.Windows.Forms/System/Windows/Forms/DataGridViewComboBoxCellTests.cs

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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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using System.ComponentModel;
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using System.Drawing;
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namespace System.Windows.Forms.Tests;
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public class DataGridViewComboBoxCellTests : IDisposable
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{
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private readonly DataGridViewComboBoxCell _dataGridViewComboBoxCell;
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public void Dispose() => _dataGridViewComboBoxCell.Dispose();
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public DataGridViewComboBoxCellTests() =>
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_dataGridViewComboBoxCell = new();
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[Fact]
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public void AutoComplete_DefaultValue_IsTrue() =>
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_dataGridViewComboBoxCell.AutoComplete.Should().BeTrue();
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[Fact]
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public void AutoComplete_SetFalse_ChangesValue()
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{
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_dataGridViewComboBoxCell.AutoComplete = false;
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_dataGridViewComboBoxCell.AutoComplete.Should().BeFalse();
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}
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[WinFormsFact]
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public void DataSource_DefaultValue_IsNull() =>
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_dataGridViewComboBoxCell.DataSource.Should().BeNull();
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[WinFormsFact]
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public void DataSource_SetToIList_StoresReference()
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{
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IList<string> list = ["a", "b"];
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_dataGridViewComboBoxCell.DataSource = list;
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_dataGridViewComboBoxCell.DataSource.Should().BeSameAs(list);
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}
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[WinFormsFact]
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public void DataSource_SetToIListSource_StoresReference()
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{
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using BindingSource bindingSource = new();
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_dataGridViewComboBoxCell.DataSource = bindingSource;
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_dataGridViewComboBoxCell.DataSource.Should().BeSameAs(bindingSource);
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}
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[WinFormsFact]
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public void DataSource_SetToInvalidType_Throws()
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{
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Exception? invalidDataSourceException = Record.Exception(() => _dataGridViewComboBoxCell.DataSource = 123);
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invalidDataSourceException.Should().BeOfType<ArgumentException>();
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}
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[WinFormsFact]
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public void DataSource_SetToNull_ClearsDisplayAndValueMember()
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{
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_dataGridViewComboBoxCell.DataSource = new List<string> { "a" };
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_dataGridViewComboBoxCell.DisplayMember = "Name";
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_dataGridViewComboBoxCell.ValueMember = "Id";
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_dataGridViewComboBoxCell.DataSource = null;
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_dataGridViewComboBoxCell.DataSource.Should().BeNull();
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_dataGridViewComboBoxCell.DisplayMember.Should().BeEmpty();
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_dataGridViewComboBoxCell.ValueMember.Should().BeEmpty();
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}
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[WinFormsFact]
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public void DisplayStyleForCurrentCellOnly_DefaultValue_IsFalse() =>
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_dataGridViewComboBoxCell.DisplayStyleForCurrentCellOnly.Should().BeFalse();
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[Fact]
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public void DropDownWidth_DefaultValue_IsOne() =>
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_dataGridViewComboBoxCell.DropDownWidth.Should().Be(1);
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[Theory]
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[InlineData(5)]
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[InlineData(100)]
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public void DropDownWidth_SetValidValue_ChangesValue(int width)
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{
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_dataGridViewComboBoxCell.DropDownWidth = width;
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_dataGridViewComboBoxCell.DropDownWidth.Should().Be(width);
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}
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[Theory]
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[InlineData(0)]
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[InlineData(-5)]
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public void DropDownWidth_SetInvalidValue_Throws(int width)
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{
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Exception? dropDownWidthOutOfRangeException = Record.Exception(() => _dataGridViewComboBoxCell.DropDownWidth = width);
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dropDownWidthOutOfRangeException.Should().BeOfType<ArgumentOutOfRangeException>();
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}
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[Fact]
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public void FlatStyle_DefaultValue_IsStandard() =>
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_dataGridViewComboBoxCell.FlatStyle.Should().Be(FlatStyle.Standard);
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[WinFormsTheory]
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[InlineData(FlatStyle.Flat)]
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[InlineData(FlatStyle.Popup)]
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[InlineData(FlatStyle.System)]
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[InlineData(FlatStyle.Standard)]
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public void FlatStyle_SetValidValue_ChangesValue(FlatStyle style)
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{
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_dataGridViewComboBoxCell.FlatStyle = style;
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_dataGridViewComboBoxCell.FlatStyle.Should().Be(style);
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}
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[Fact]
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public void MaxDropDownItems_DefaultValue_IsEight() =>
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_dataGridViewComboBoxCell.MaxDropDownItems.Should().Be(DataGridViewComboBoxCell.DefaultMaxDropDownItems);
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[Theory]
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[InlineData(1)]
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[InlineData(50)]
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[InlineData(100)]
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public void MaxDropDownItems_SetValidValue_ChangesValue(int value)
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{
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_dataGridViewComboBoxCell.MaxDropDownItems = value;
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_dataGridViewComboBoxCell.MaxDropDownItems.Should().Be(value);
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}
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[Theory]
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[InlineData(0)]
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[InlineData(-1)]
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[InlineData(101)]
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[InlineData(200)]
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public void MaxDropDownItems_SetInvalidValue_Throws(int value)
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{
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Exception? maxDropDownItemsOutOfRangeException = Record.Exception(() => _dataGridViewComboBoxCell.MaxDropDownItems = value);
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maxDropDownItemsOutOfRangeException.Should().BeOfType<ArgumentOutOfRangeException>();
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}
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[Fact]
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public void Sorted_DefaultValue_IsFalse() =>
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_dataGridViewComboBoxCell.Sorted.Should().BeFalse();
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[Fact]
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public void Sorted_SetTrue_WithoutDataSource_SetsFlag()
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{
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_dataGridViewComboBoxCell.Sorted = true;
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_dataGridViewComboBoxCell.Sorted.Should().BeTrue();
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}
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[WinFormsFact]
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public void Sorted_SetTrue_WithDataSource_Throws()
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{
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_dataGridViewComboBoxCell.DataSource = new List<string> { "a", "b" };
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Exception? sortedWithDataSourceException = Record.Exception(() => _dataGridViewComboBoxCell.Sorted = true);
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sortedWithDataSourceException.Should().BeOfType<ArgumentException>();
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}
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[Fact]
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public void ValueMember_DefaultValue_IsEmpty() =>
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_dataGridViewComboBoxCell.ValueMember.Should().BeEmpty();
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[WinFormsTheory]
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[InlineData("Id")]
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[InlineData("Name")]
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[InlineData("")]
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public void ValueMember_SetValue_ChangesValue(string value)
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{
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_dataGridViewComboBoxCell.ValueMember = value;
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_dataGridViewComboBoxCell.ValueMember.Should().Be(value);
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}
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[Fact]
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public void ValueType_DefaultValue_IsObject() =>
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_dataGridViewComboBoxCell.ValueType.Should().Be(typeof(object));
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private class StubPropertyDescriptor : PropertyDescriptor
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{
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private readonly Type _propertyType;
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public StubPropertyDescriptor(string name, Type propertyType)
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: base(name, null)
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{
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_propertyType = propertyType;
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}
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public override Type PropertyType => _propertyType;
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public override void SetValue(object? component, object? value) { }
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public override object? GetValue(object? component) => null!;
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public override bool CanResetValue(object? component) => false;
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public override void ResetValue(object? component) { }
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public override bool IsReadOnly => true;
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public override Type ComponentType => typeof(object);
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public override bool ShouldSerializeValue(object? component) => false;
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}
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[Fact]
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public void ValueType_WithDisplayMemberProperty_ReturnsPropertyType()
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{
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StubPropertyDescriptor prop = new("Name", typeof(string));
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_dataGridViewComboBoxCell.TestAccessor().Dynamic.DisplayMemberProperty = prop;
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_dataGridViewComboBoxCell.TestAccessor().Dynamic.ValueMemberProperty = null;
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_dataGridViewComboBoxCell.ValueType.Should().Be(typeof(string));
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}
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[Fact]
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public void GetContentBounds_ReturnsEmpty_WhenDataGridViewIsNull()
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{
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using Bitmap bmp = new(10, 10);
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using Graphics g = Graphics.FromImage(bmp);
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DataGridViewCellStyle style = new();
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Rectangle result = _dataGridViewComboBoxCell.TestAccessor().Dynamic.GetContentBounds(g, style, 0);
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result.Should().Be(Rectangle.Empty);
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}
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[Fact]
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public void GetContentBounds_ReturnsEmpty_WhenRowIndexIsNegative()
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{
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using DataGridView dataGridView = new();
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using DataGridViewComboBoxColumn column = new() { CellTemplate = _dataGridViewComboBoxCell };
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dataGridView.Columns.Add(column);
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using Bitmap bmp = new(10, 10);
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using Graphics g = Graphics.FromImage(bmp);
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DataGridViewCellStyle style = new();
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Rectangle result = _dataGridViewComboBoxCell.TestAccessor().Dynamic.GetContentBounds(g, style, -1);
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result.Should().Be(Rectangle.Empty);
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}
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[Fact]
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public void GetErrorIconBounds_ReturnsEmpty_WhenDataGridViewIsNull()
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{
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using Bitmap bmp = new(10, 10);
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using Graphics g = Graphics.FromImage(bmp);
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DataGridViewCellStyle style = new();
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Rectangle result = _dataGridViewComboBoxCell.TestAccessor().Dynamic.GetErrorIconBounds(g, style, 0);
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result.Should().Be(Rectangle.Empty);
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}
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[Fact]
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public void GetErrorIconBounds_UsingTestAccessor_ReturnsEmpty_WhenRowIndexIsNegative()
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{
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using DataGridView dataGridView = new();
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using DataGridViewComboBoxColumn column = new() { CellTemplate = _dataGridViewComboBoxCell };
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dataGridView.Columns.Add(column);
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using Bitmap bmp = new(10, 10);
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using Graphics g = Graphics.FromImage(bmp);
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DataGridViewCellStyle style = new();
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Rectangle result = _dataGridViewComboBoxCell.TestAccessor().Dynamic.GetErrorIconBounds(g, style, -1);
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result.Should().Be(Rectangle.Empty);
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}
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[Fact]
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public void GetPreferredSize_ReturnsMinusOne_WhenDataGridViewIsNull()
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{
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using Bitmap bmp = new(10, 10);
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using Graphics g = Graphics.FromImage(bmp);
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DataGridViewCellStyle style = new();
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Size result = _dataGridViewComboBoxCell.TestAccessor().Dynamic.GetPreferredSize(
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g,
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style,
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0,
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new Size(100, 20));
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result.Should().Be(new Size(-1, -1));
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}
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[Theory]
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[InlineData(Keys.A, false, false, false, true)]
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[InlineData(Keys.F4, false, false, false, true)]
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[InlineData(Keys.Space, false, false, false, true)]
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[InlineData(Keys.Space, true, false, false, false)]
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[InlineData(Keys.Down, false, true, false, true)]
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[InlineData(Keys.Up, false, true, false, true)]
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[InlineData(Keys.Down, false, false, false, false)]
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[InlineData(Keys.F1, false, false, false, false)]
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[InlineData(Keys.F24, false, false, false, false)]
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[InlineData(Keys.A, false, false, true, false)]
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public void KeyEntersEditMode_ReturnsExpected(Keys key, bool shift, bool alt, bool control, bool expected)
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{
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Keys keyData = key;
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if (shift)
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{
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keyData |= Keys.Shift;
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}
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if (alt)
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{
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keyData |= Keys.Alt;
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}
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if (control)
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{
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keyData |= Keys.Control;
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}
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KeyEventArgs e = new(keyData);
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bool result = _dataGridViewComboBoxCell.KeyEntersEditMode(e);
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result.Should().Be(expected);
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}
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[Fact]
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public void ParseFormattedValue_UsesValueTypeConverter_WhenValueTypeConverterIsProvided()
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{
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using DataGridView dataGridView = new();
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using DataGridViewComboBoxColumn column = new() { CellTemplate = _dataGridViewComboBoxCell };
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dataGridView.Columns.Add(column);
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DataGridViewCellStyle style = new();
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object? result = _dataGridViewComboBoxCell.ParseFormattedValue(
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"test",
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style,
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null,
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TypeDescriptor.GetConverter(typeof(string)));
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result.Should().Be("test");
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}
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[Fact]
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public void ParseFormattedValue_UsesValueMemberPropertyConverter_WhenValueTypeConverterIsNull()
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{
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using DataGridView dataGridView = new();
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using DataGridViewComboBoxColumn column = new() { CellTemplate = _dataGridViewComboBoxCell };
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dataGridView.Columns.Add(column);
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DataGridViewCellStyle style = new();
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StubPropertyDescriptor prop = new("Id", typeof(string));
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_dataGridViewComboBoxCell.TestAccessor().Dynamic.ValueMemberProperty = prop;
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object? result = _dataGridViewComboBoxCell.ParseFormattedValue("abc", style, null, null);
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result.Should().Be("abc");
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}
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[Fact]
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public void ParseFormattedValue_UsesParseFormattedValueInternal_WithValueType_WhenNoDataManagerOrMembers()
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{
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using DataGridView dataGridView = new();
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using DataGridViewComboBoxColumn column = new() { CellTemplate = _dataGridViewComboBoxCell };
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dataGridView.Columns.Add(column);
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DataGridViewCellStyle style = new();
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object? result = _dataGridViewComboBoxCell.ParseFormattedValue("test", style, null, null);
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result.Should().Be("test");
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}
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}

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