The Cell Handlers currently active are held in cell handler lists. You can add and remove cell handlers from a cell handler list to change the cell handling behavior. The core Fit fixtures and the FitLibrary fixtures have had different default cell handling behavior, and to preserve backwards compatibility, there are two cell handler lists, one for core Fit and one for FitLibrary.

CellMatching
actual type	actual value	expected value	cell handlers		matches
string		blank	fit		True		blank is a core keyword
string		blank	fitlibrary		False		but not for fitlibrary

By adding a cell handler, the matching behavior is changed.

cell handler loader
load	BlankKeywordHandler	fitlibrary

CellMatching
actual type	actual value	expected value	cell handlers		matches
string		blank	fitlibrary		True		now works for fitlibrary

You can add and remove cell handlers in the Suite Configuration File.

You can add and remove handlers in the story test with the CellHandlerLoaderFixture.

CellHandlerLoader
load	BlankKeywordHandler	FitLibrary
remove	BlankKeywordHandler	Fit
reset	FitLibrary
reset	Fit

You can add and remove handlers in fixture code.

Configuration.Instance.FitLibraryCellHandlers.Add("BlankKeywordHandler");
Configuration.Instance.FitCellHandlers.Remove("BlankKeywordHandler");