Description
Documentation Feedback
The description of MatCellHarness.getColumnName() states that it
Gets the name of the column that the cell belongs to.
What it DOESN'T say is that if the column name has any symbols in it like dots or backslashes or anything that the _setNameInput method in CdkColumnDef would consider not CSS friendly, the harness will instead return that column's name with all of the offending characters replaced with dashes
Example:
Let's say that I've defined row template as per point 3 in MatTable's Getting Started section, and one of the columns is called "bar.tar"
columnsToDisplay = ['foo', 'bar.tar'];
Later on I'm writing tests and using test harnesses to get a list of that table's columns
// cells is of type MatCellHarness[]
const columnNames = await parallel(() => cells.map(cell => cell.getColumnName()));
// columnNames is ['foo', 'bar-tar']
As I understand, it's because the cell harness uses the cell's own CSS class to deduct its column's name, which is fair enough, but I do strongly think that this behaviour should be documented
Affected documentation page
https://material.angular.io/components/table/api#MatCellHarness