Missing unit tests coverage of public methods in Design namespace

[SimonZhao888]

We are in the process of adding unit tests for all public methods to improve the test coverage of code. Here is a list categorized by namespace.

System.Windows.Forms.Design

• AxImporter.cs Add unit tests for AxImporter #11784
• BaseContextMenuStrip.cs Add test coverage for BaseContextMenuStrip #11723
• BindingNavigatorDesigner.cs Adds coverage for BindingNavigatorDesigner #13883
• BindingSourceDesigner.cs Add unit test for BindingSourceDesigner.cs file #11775
• ButtonBaseDesigner.cs Add unit tests for ButtonBaseDesigner #11690
• ChangeToolStripParentVerb.cs Issue 10773 Adds code coverage for public members of ChangeToolStripParentVerb. #13445
• CollectionEditVerbManager.cs Add test for CollectionEditVerbManager #12088
• ComboBoxDesigner.cs Add ComboBoxDesigner tests #10772
• CommandSet.cs Add unit tests for CommandSet #12769
• ComponentDesigner Add ComponentDesigner tests and fix bugs #1053
• ComponentTray.cs Adds coverage for ComponentTray #13396
• CompositionDesigner.cs Add unit tests for CompositionDesigner #11888
• ContextMenuStripActionList.cs Add unit tests for ContextMenuStripActionListTests #12442
• ContextMenuStripGroup.cs Add unit tests for ContextMenuStripGroup #11989
• ContextMenuStripGroupCollection.cs Add unit tests for ContextMenuStripGroupCollection #11952
• ControlCodeDomSerializer.cs Add code coverage for ControlCodeDomSerializer #13011
• ControlCommandSet.cs Add code coverage for ControlCommandSet.cs file #13130
• ControlDesigner.ControlDesignerAccessibleObject.cs Add unit tests for ControlDesigner.ControlDesignerAccessibleObject #12664
• ControlDesigner.DesignerControlCollection.cs Add unit tests for ControlDesigner.DesignerControlCollection #12085
• ControlDesigner.TransparentBehavior.cs Add unit tests for ControlDesigner.TransparentBehavior #12694
• ControlDesigner.cs Adds coverage to ControlDesigner #12410
• CustomMenuItemCollection.cs Add unit tests for CustomMenuItemCollection #12035
• DataGridViewAddColumnDialog.cs Write unit test for DataGridViewAddColumnDialog #12662
• DataGridViewCellStyleBuilder.cs Add unit tests for DataGridViewCellStyleBuilder #12318
• DataGridViewCellStyleEditor.cs Add IClassFixture<ThreadExceptionFixture> to all tests #2684
• DataGridViewColumnDesigner.cs Add unit tests for DataGridViewColumnDesigner #12355
• DataGridViewComponentPropertyGridSite.cs Add unit tests for DataGridViewComponentPropertyGridSite #12357
• DataGridViewColumnTypeEditor Add code coverage for DataGridViewColumnTypeEditor #13084
• DataGridViewColumnType.Picker Add code coverage for DataGridViewColumnTypePicker #13055
• DataGridViewDesigner.cs Add code coverage for DataGridViewDesigner #13014
• DataSourceDescriptorCollection.cs Add unit tests for DataSourceDescriptorCollection #12432
• DataSourceGroupCollection.cs Add unit tests for DataSourceGroupCollection #12430
• DataSourceListEditor.cs Add coverage for DataSourceListEditor #13122
• DateTimePickerDesigner.cs Add unit tests for DateTimePickerDesigner #11702
• DesignBinding.cs Add core coverage for DesignBinding #11748
• DesignBindingPicker.cs Add test for design binding picker #13536
• DesignBindingValueUIHandler Add code coverage for DesignBindingValueUIHandler #13100
• DesignerExtenders.cs Add unit tests for DesignerExtenders #12337
• DesignerFrame.cs Add unit tests for DesignerFrame #12712
• DesignerToolStripControlHost.cs Add unit tests for DesignerToolStripControlHost #12086
• DesignerUtils.cs Add code coverage for DesignerUtils #13341 Add code coverage for DesignerUtils #13384 Add code coverage for DesignerUtils #13435
• DesignerVerbToolStripMenuItem.cs Add unit tests for DesignerVerbToolStripMenuItem #12566
• DocumentDesigner.cs
• EditorServiceContext.cs Add unit tests for EditorServiceContext #13273
• FlowPanelDesigner.cs Add unit tests for FlowPanelDesigner #11735
• FolderNameEditor.cs Adds code coverage to FolderNameEditor #11973
• FormDocumentDesigner.cs
• FormatControl.CurrencyFormatType.cs (private class)
• FormatControl.CustomFormatType.cs (private class)
• FormatControl.DateTimeFormatType.cs (private class)
• FormatControl.NoFormattingFormatType.cs (private class)
• FormatControl.NumericFormatType.cs (private class)
• FormatControl.ScientificFormatType.cs (private class)
• FormatControl.cs Adds code coverage to FormatControl #12168
• FormatStringDialog.cs Adds code coverage to FormatStringDialog #12185
• FormatStringEditor.cs Adds code coverage to FormatStringEditorTests #12208
• FlowLayoutPanelDesigner Add code coverage for FlowLayoutPanelDesigner.cs file #13257
• GroupedContextMenuStrip.cs Enable nullability in GroupedContextMenuStrip and NewItemsContextMenuStrip #11183
• ImageCollectionCodeDomSerializer.cs Add unit test for ImageListCodeDomSerializer #12753
• ImageIndexEditor.cs Adds code coverage to ImageIndexEditor #12237
• ImageListActionList.cs Add unit test for image list action list #11766
• ImageListDesigner.OriginalImageCollection.cs Fixes the Remove() and IndexOf() methods in the ImageListDesigner.OriginalImageCollection class and adds coverage to it #12282
• ImageListDesigner.cs Add unit test for ImageListDesigner #11725
• ImageListImage.cs Add unit test for ImageListImage #11736
• ImageListImageEditor.cs do not dispose stream owned by image #3404
• InheritanceUI.cs Add unit tests for InheritanceUI #12016
• ItemTypeToolStripMenuItem.cs Add unit tests for ItemTypeToolStripMenuItem #12199
• LabelDesigner.cs Add LabelDesigner tests #10771
• LinkAreaEditor.LinkAreaUI.cs Add unit tests for LinkAreaEditor.LinkAreaUI #12725
• LinkAreaEditor.cs Add unit test for LinkAreaEditor #12718
• ListAdapter.cs Add core coverage for ListAdapter #12093
• ListBoxDesigner.cs Add tests for ListBoxDesigner #11712
• ListControlStringCollectionEditor.cs Add unit tests for ListControlStringCollectionEditor #12516
• ListControlUnboundActionList.cs Add unit test for ListControlUnboundActionList #12770
• ListViewActionList.cs Add unit tests for ListViewActionList #11782
• ListViewDesigner.cs Add code coverage for ListViewDesigner #13301
• ListViewGroupCollectionEditor.cs Add code coverage for ListViewGroupCollectionEditor #13275
• MaskDescriptor.cs Add test code coverage for MaskDescriptor #11703
• MaskDescriptorComparer.cs Add code coverage for MaskDescriptorComparer #11734
• MaskDescriptorTemplate.cs Add code coverage for MaskDescriptorTemplate #11743
• MaskDesignerDialog.cs Add unit test for MaskDesignerDialog #12575
• MaskPropertyEditor.cs Add unit tests for MaskPropertyEditor #11955
• MaskedTextBoxDesigner.cs Add MaskedTextBoxDesigner tests #10780
• MaskedTextBoxTextEditor.cs Add tests for MaskedTextBoxTextEditor #11737
• MaskedTextBoxTextEditorDropDown.cs Add tests for MaskedTextBoxTextEditorDropDown.cs #12244
• MaskedTextBoxDesignerActionList.cs Add unit test for MaskedTextBoxDesignerActionList #12491
• MenuCommands Add misc Design tests and fix a NullRef bug #807
• MonthCalendarDesigner.cs Add test case for MonthCalendarDesigner #11692
• NotifyIconDesigner Add test case for NotifyIconDesigner #11774
• NotifyIconDesignerActionList Add unit test for NotifyIconActionList #12813
• OleDragDropHandler Add code coverage for OleDragDropHandler.cs file #13022
• PanelDesigner Add unit tests for PanelDesigner #12113
• ParentControlDesigner.cs Add unit tests for ParentControlDesigner #13173
• PictureBoxActionList Add unit tests for PictureBoxActionList #12201
• PrintDialogDesigner Add unit tests for PrintDialogDesigner #12117
• RichTextBoxDesigner Add code coverage for RichTextBoxDesigner #12061
• RichTextBoxActionList Add code coverage for RichTextBoxActionList #12131
• SRDisplayNameAttribute Add unit tests for SRDisplayNameAttribute #12169
• ScrollableControlDesigner
• SelectionUIHandler Add code coverage for SelectionUIHandler.cs file #13013
• SplitterDesigner Add unit tests for SplitterDesigner #12359
• SplitterPanelDesigner Add test for SplitterPanelDesigner.cs #12269
• StatusBarDesigner StatusBar control is deprecated
• ShortcutKeysEditor Add ShortcutKeysEditor tests and fix some bugs #1297
• StandardCommandToolStripMenuItem Add code coverage for StandardCommandToolStripMenuItem #13215
• StandardMenuStripVerb Adds code coverage to StandardMenuStripVerb #13492
• StatusCommandUI Add unit tests for StatusCommandUI #13121
• TabControlDesigner Add unit test for TabControlDesigner.cs file #12130
• TableLayoutPanelCodeDomSerializer Add test for TableLayoutPanelCodeDomSerializer #13212
• TableLayoutPanelDesigner Add unit tests for TableLayoutPanelDesigner #13028
• TabOrder Add code coverage for TabOrder #13181
• TabPageDesigner Add unit test for TabPageDesigner.cs file #12097
• TemplateNodeCustomMenuItemCollection Add unit tests for CustomMenuItemCollection #12035
• TextBoxDesigner Add unit tests for TextBoxDesigner #12095
• UpDownBaseDesigner.cs Add unit test for UpDownBaseDesigner #12364
• UserControlDocumentDesigner.cs add unit test for UserControlDocumentDesigner #12710
• TextBoxBaseDesigner Add unit test for TextBoxBaseDesigner #12433
• TextBoxActionList Add unit tests for TextBoxActionList #12198
• ToolStripActionList Add unit tests for ToolStripActionList #12525
• ToolStripAdornerWindowService Add unit tests for ToolStripAdornerWindowService #13029
• ToolStripDesignerUtils Add unit tests for ToolStripDesignerUtils.cs file #12967
• ToolStripContainerActionList Add code coverage for ToolStripContainerActionList #13256
• ToolStripContentPanelDesigner Add unit tests for ToolStripContentPanelDesigner #12366
• ToolStripContainerDesigner Add unit tests for ToolStripContainerDesigner #12200
• ToolStripDropDownDesigner Add AssociatedComponents test of ToolStripDropDownDesigner ToolStripDropDownItemDesigner ToolStripMenuItemDesigner #9575
• ToolStripPanelDesigner Add unit tests for ToolStripPanelDesigner #12922
• ToolStripKeyboardHandlingService
• ToolStripMenuItemCodeDomSerializer Add unit tests for ToolStripMenuItemCodeDomSerializer #12883 Adds some specific serialization test cases for the ToolStripMenuItemCodeDomSerializer class #13200
• ToolStripInSituService Issue 10773 add coverage for ToolStripInSituService #13297
• ToolStripEditorManager Add code coverage for ToolStripEditorManager #13218
• ToolStripCollectionEditor Add code coverage for ToolStripCollectionEditor.cs file #12962
• ToolStripCustomTypeDescriptor.cs Add code coverage for ToolStripCustomTypeDescriptor #12963
• WebBrowserDesigner This designer has not been ported, tracking it with Support AxDesigner, AxHostDesigner and WebBrowserDesigner capabilities at runtime #9810

[ricardobossan]

There's also this previous list of controls, that were added on #10453 :

[Tanya-Solyanik]

@SimonZhao888 - could you please use this bug only for public classes from System.Windows.Forms.Design namespace - https://github.com/dotnet/winforms/tree/main/src/System.Windows.Forms.Design/src? And then add help-wanted label. We will use this bug to track tests added by contributors.

[sharwell]

Also remember the goal here isn't to increase code coverage. The goal is to identify user/developer scenarios which people are depending on today, and add tests that make it unlikely we would break those users in the future. Every added test should be written from the perspective of what someone using WinForms will try to do, and validate they will get the expected result.

The difference is subtle for public APIs, but for internal APIs that aren't always obvious to invoke, it becomes important to try and write tests targeting those features against public APIs where possible. Tests that exercise behavior using public APIs better reflect user behavior and the tests are much easier to understand if a failure ever shows up.

This issue is now marked as "help wanted", and we’re looking for a community volunteer to work on this issue. If we receive no interest in 180 days, we will close the issue. To learn more about how we handle feature requests, please see our documentation.

Happy Coding!