Mat Chip Test Harness: Support editing chips using the test harness

[0acwilliams0]

Feature Description

matChipInputFor allows editing input values after a chip has been created (e.g. https://material.angular.io/components/chips/examples#chips-input), however, none of the relevant test harnesses support performing an edit action (e.g. https://material.angular.io/components/chips/api#MatChipRowHarness). There appears to be a isEditing() method, but no apparent way to use the test harness to get the chip row into an editing state (and no way to actually perform the edit even if you do manage to start editing via const host = await chipRow.host(); await host.sendKeys(TestKey.ENTER)).

Use Case

Editing chips is finicky and non-trivial to simulate in test code. Without this feature, components that support chip input editing either have to:

• Not test their editing functionality OR
• Use brittle and unreliable methods of triggering and performing the edit e.g. directly accessing the matChipInput instance or the editable span.

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