Create a stub experiment manager for JS tests
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	phuedx
	Sep 26 2025, 10:38 AM

Description

Background

In T404058: Add MetricsPlatform to gated extensions, I decided not to make MetricsPlatform a gated extension but instead to provide a stub experiment manager for JS tests. This task covers doing that.

AC

Calling mw.xLab.mockExperimentEnrollment( name, group ) defines a mock experiment for the duration of the test and returns a mocked Experiment instance
Calling mw.xLab.getExperiment( name ) returns the same mocked Experiment instance
Calling mw.xLab.restoreMockExperiments() removes all mock experiments