When writing an Android test JUnit rule, is there a good way to write to SharedPreferences in it? Wr...

# android

[Steve]

When writing an Android test JUnit rule, is there a good way to write to SharedPreferences in it? Writing to SharedPreferences requires a Context

[ephemient]

if you can't fake out your Android dependencies, you'll need to use Robolectric or instrumentation test

[Steve]

this is for an instrumentation test

[Steve]

i want to set a state by setting some keys in shared preferences, and I'd prefer to do so using a rule

[Cedrick Cooke]

@Steve SharedPreferences is just an interface. It's not that much work to write your own implementation of it which is backed by MutableMap<String, Any?> , and then just dependency-inject that in-memory instance. I'd share code, but ours lives in the closed source portion of our app.