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Adding the emitter to the exports allows a developer to stop a running set of (singleRun) tests using the below code:
karma.emitter().emit('run_complete', [], {exitCode: 0});
This could be more elegant since doing this will stop a running set of tests but leaves the browser hanging. Eventually the browser timeout cleans it up with a bad error message. It would be nicer to stop the tests without the browser crashing.