Overriding Service Dependencies in a Layer for Testing

Is there a way for one to override a service dependency in a

Layer

Layer

? Say I have already constructed a layer like this:

const IngredientsLive = Layer.merge(FlourLive, SugarLive)
 
const MainLive = RecipeLive.pipe(
  Layer.provide(IngredientsLive),
  Layer.provideMerge(MeasuringCupLive)
  //Dozens of other Service Dependencies...
)

const IngredientsLive = Layer.merge(FlourLive, SugarLive)
 
const MainLive = RecipeLive.pipe(
  Layer.provide(IngredientsLive),
  Layer.provideMerge(MeasuringCupLive)
  //Dozens of other Service Dependencies...
)

Then for testing purposes I wish to create a new

Layer

Layer

(using

MainLive

MainLive

) where I provide a failing implementation of

MeasuringCup

MeasuringCup

. I wish to use the existing

MainLive

MainLive

to save me from building the entire service stack again.

MainLive.pipe(
  Layer.provide(MeasuringCupFailure)
)

MainLive.pipe(
  Layer.provide(MeasuringCupFailure)
)

I've tested that this does not replace the

MeasuringCupLive

MeasuringCupLive

implementation. Am I missing something? This is something I would think is useful.

Effect Community•2y ago

Bartholdy

Overriding Service Dependencies in a Layer for Testing

Is there a way for one to override a service dependency in a

Layer

Layer

? Say I have already constructed a layer like this:

const IngredientsLive = Layer.merge(FlourLive, SugarLive)
 
const MainLive = RecipeLive.pipe(
  Layer.provide(IngredientsLive),
  Layer.provideMerge(MeasuringCupLive)
  //Dozens of other Service Dependencies...
)

const IngredientsLive = Layer.merge(FlourLive, SugarLive)
 
const MainLive = RecipeLive.pipe(
  Layer.provide(IngredientsLive),
  Layer.provideMerge(MeasuringCupLive)
  //Dozens of other Service Dependencies...
)

Then for testing purposes I wish to create a new

Layer

Layer

(using

MainLive

MainLive

) where I provide a failing implementation of

MeasuringCup

MeasuringCup

. I wish to use the existing

MainLive

MainLive

to save me from building the entire service stack again.

MainLive.pipe(
  Layer.provide(MeasuringCupFailure)
)

MainLive.pipe(
  Layer.provide(MeasuringCupFailure)
)

I've tested that this does not replace the

MeasuringCupLive

MeasuringCupLive

implementation. Am I missing something? This is something I would think is useful.

Overriding Service Dependencies in a Layer for Testing

Similar Threads

Overriding Service Dependencies in a Layer for Testing

Similar Threads

Similar Threads

Similar Threads