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test: increase coverage for lib/events.js

Rodrigo Muino Tomonari requested to merge github/fork/captainsafia/event-emitter-coverage into master
Checklist
  • make -j8 test (UNIX), or vcbuild test nosign (Windows) passes
  • commit message follows commit guidelines
Affected core subsystem(s)

test, events

Description of change

This adds a test for the case in which listeners() is invoked on an EventEmitter with no events.

Note that the EventEmitter does not allow _events to ever be undefined as it is instantiated in the initializer. The only situation in which it might be undefined is if it is monkey-patched externally. Because of this, the added tests monkey-patches this._events to mimic this expected behavior.

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