IntermediateLEADERSHIP
As a mid-level developer on a team, how have you mentored junior engineers on testing Android components (unit tests for ViewModel, instrumentation tests for UI) and improved the team’s test coverage or CI pipeline?
Android Developer
General

Sample Answer

At my last company I coached three junior Android engineers while we moved from ~28% to 68% test coverage in six months. I started by running a 90-minute workshop showing how to write fast ViewModel unit tests with Mockito and coroutines TestDispatcher, then paired with each engineer to add tests for their existing features. For UI I introduced Espresso idling resources and a lightweight screen-object pattern so instrumentation tests were stable. I also added a Gradle task to run unit + instrumentation on separate CI stages and gated merges if coverage dropped by more than 3%. The result: fewer regressions, 30% faster PR cycles, and our sprint bug backlog shrank by half over two quarters.

Keywords

Hands-on workshops + pairing to teach ViewModel unit testingStabilized UI tests with Espresso patterns and idling resourcesCI changes: staged test runs and coverage gates, measurable improvements
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