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package zio.test
import zio._
import zio.internal.stacktracer.Tracer
import zio.stacktracer.TracingImplicits.disableAutoTrace
/**
* The `Live` trait provides access to the "live" default ZIO services from
* within ZIO Test for workflows such as printing test results to the console or
* timing out tests where it is necessary to access the real implementations of
* these services.
*
* The easiest way to access the "live" services is to use the `live` method
* with a workflow that would otherwise use the test version of the default ZIO
* services.
*
* {{{
* import zio.Clock
* import zio.test._
*
* val realTime = live(Clock.nanoTime)
* }}}
*
* The `withLive` method can be used to apply a transformation to a workflow
* with the live services while ensuring that the workflow itself still runs
* with the test services, for example to time out a test. Both of these methods
* are re-exported in the ZIO Test package object for easy availability.
*/
trait Live {
def provide[R, E, A](zio: ZIO[R, E, A])(implicit trace: Trace): ZIO[R, E, A]
}
object Live {
val tag: Tag[Live] = Tag[Live]
final case class Test(zenv: ZEnvironment[Clock with Console with System with Random]) extends Live {
def provide[R, E, A](zio: ZIO[R, E, A])(implicit trace: Trace): ZIO[R, E, A] =
DefaultServices.currentServices.locallyWith(_.unionAll(zenv))(zio)
}
/**
* Constructs a new `Live` service that implements the `Live` interface. This
* typically should not be necessary as the `TestEnvironment` already includes
* the `Live` service but could be useful if you are mixing in interfaces to
* create your own environment type.
*/
val default: ZLayer[Clock with Console with System with Random, Nothing, Live] = {
implicit val trace = Tracer.newTrace
ZLayer.scoped {
for {
zenv <- ZIO.environment[Clock with Console with System with Random]
live = Test(zenv)
_ <- withLiveScoped(live)
} yield live
}
}
/**
* Provides a workflow with the "live" default ZIO services.
*/
def live[R, E, A](zio: ZIO[R, E, A])(implicit trace: Trace): ZIO[R, E, A] =
liveWith(_.provide(zio))
/**
* Runs a transformation function with the live default ZIO services while
* ensuring that the workflow itself is run with the test services.
*/
def withLive[R, E, E1, A, B](
zio: ZIO[R, E, A]
)(f: ZIO[R, E, A] => ZIO[R, E1, B])(implicit trace: Trace): ZIO[R, E1, B] =
DefaultServices.currentServices.getWith(services => live(f(DefaultServices.currentServices.locally(services)(zio))))
}
