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# kotlin-test
## Status
Accepted
## Context
`kotlin-test` is a core Kotlin library, mostly providing idiomatic Kotlin assertion functions,
and we weren't using it in our tests.
## Decision
Introduce a dependency on `kotlin-test` in unit and Android test source sets across Fenix, Focus,
Android Components and GeckoView. Encourage using its affordances. Start transitioning existing
JUnit usages to `kotlin-test` with the expectation to transition to using it more in the future.
## Consequences
`kotlin-test` adds about 17 new functions (mostly assertions) and 6 annotations on top of JUnit.
Their advantages include:
* idiomatic Kotlin API,
* improved compiler/IDE code analysis (smart casts, dead code detection),
* improved failure messages.
## See also