Ensure that classes in the System.Windows.Forms namespace have adequate unit test coverage

[LeafShi1]

Please start with classes with coverage below 20% (marked in red in the codecov.io, and prioritize public and protected virtual methods.

• Controls/Buttons:

  • ButtonRenderer.cs - 19.88%
  • ButtonFlatAdapter.cs – 14.91%
  • ButtonPopupAdapter.cs – 16.39%
  • CheckBoxBaseAdapter.cs – 16.97%
  • CheckBoxFlatAdapter.cs – 4.48%
  • CheckBoxPopupAdapter.cs – 2.59%
  • RadioButtonBaseAdapter.cs – 9.27%
  • RadioButtonFlatAdapter.cs – 1.64%
  • RadioButtonPopupAdapter.cs – 1.52%

• DataGridView:

  • DataGridViewButtonCell.DataGridViewButtonCellRenderer.cs – 0.00%
  • DataGridViewButtonCell.cs – 6.16%
  • DataGridViewCheckBoxCell.DataGridViewCheckBoxCellRenderer.cs – 0.00%
  • DataGridViewComboBoxCell.DataGridViewComboBoxCellRenderer.cs – 0.00%
  • DataGridViewComboBoxCell.cs – 15.49%
  • DataGridViewComboBoxColumn.cs – 7.12%
  • DataGridViewImageCell.cs – 8.13%
  • DataGridViewImageColumn.cs – 11.18%
  • DataGridViewLinkCell.cs – 11.97%

• DateTimePicker:

  • DateTimePicker.EnumChildren.cs - 0%

• ImageList:

  • ImageListConverter.cs

• ListView:

  • ListView.CheckedListViewItemCollection.cs – 18.34%
  • ListView.IconComparer.cs – 0.00%
  • ListView.ListViewItemCollection.IInnerList.cs – 0.00%
  • ListViewItemStateImageIndexConverter.cs – 15.22%

• PropertyGrid/PropertyGridInternal:

  • ArrayElementGridEntry.cs – 0.00%
  • GridEntryRecreateChildrenEventArgs.cs – 0.00%
  • GridToolTip.cs – 19.17%
  • MergePropertyDescriptor.MultiMergeCollection.cs – 0.00%
  • MultiPropertyDescriptorGridEntry.cs – 6.77%
  • PropertyDescriptorGridEntry.ExceptionConverter.cs – 0.00%
  • PropertyDescriptorGridEntry.ExceptionEditor.cs – 0.00%
  • PropertyGridCommands.cs – 0.00%

• Splitter:

  • Splitter.SplitterMessageFilter.cs - 0%

• TabControl:

  • TabRenderer.cs - 0%

• ToolStrips:

  • ToolStrip.RestoreFocusMessageFilter.cs – 14.81%
  • ToolStripContainer.ToolStripContainerTypedControlCollection.cs – 13.33%
  • ToolStripManager.ModalMenuFilter.HostedWindowsFormsMessageHook.cs – 0.00%
  • ToolStripPanel.FeedbackRectangle.FeedbackDropDown.cs – 0.00%
  • ToolStripPanel.FeedbackRectangle.cs – 0.00%
  • ToolStripProfessionalLowResolutionRenderer.cs – 0.00%

• UpDown:

  • DomainUpDown.DomainItemAccessibleObject.cs – 0.00%
  • DomainUpDown.DomainUpDownAccessibleObject.cs – 0.00%
  • UpDownBase.UpDownBaseAccessibleObject.cs – 16.67%

• WebBrowser:

  • HtmlElementErrorEventArgs.cs – 0.00%
  • HtmlHistory.cs – 0.00%
  • HtmlWindow.HTMLWindowEvents2.cs – 0.00%
  • WebBrowserContainer.cs – 11.70%
  • WebBrowserUriTypeConverter.cs – 0.00%