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/*
* Copyright 2019-2023 John A. De Goes and the ZIO Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package zio.test
import zio.{IO, Layer, Ref, System, Trace, UIO, URIO, Unsafe, ZIO, ZLayer}
import zio.internal.stacktracer.Tracer
import zio.stacktracer.TracingImplicits.disableAutoTrace
/**
* `TestSystem` supports deterministic testing of effects involving system
* properties. Internally, `TestSystem` maintains mappings of environment
* variables and system properties that can be set and accessed. No actual
* environment variables or system properties will be accessed or set as a
* result of these actions.
*
* {{{
* import zio.system
* import zio.test.TestSystem
*
* for {
* _ <- TestSystem.putProperty("java.vm.name", "VM")
* result <- system.property("java.vm.name")
* } yield result == Some("VM")
* }}}
*/
trait TestSystem extends System with Restorable {
def putEnv(name: String, value: String)(implicit trace: Trace): UIO[Unit]
def putProperty(name: String, value: String)(implicit trace: Trace): UIO[Unit]
def setLineSeparator(lineSep: String)(implicit trace: Trace): UIO[Unit]
def clearEnv(variable: String)(implicit trace: Trace): UIO[Unit]
def clearProperty(prop: String)(implicit trace: Trace): UIO[Unit]
}
object TestSystem extends Serializable {
final case class Test(systemState: Ref.Atomic[TestSystem.Data]) extends TestSystem {
/**
* Returns the specified environment variable if it exists.
*/
def env(variable: => String)(implicit trace: Trace): IO[SecurityException, Option[String]] =
ZIO.succeed(unsafe.env(variable)(Unsafe.unsafe))
/**
* Returns the specified environment variable if it exists or else the
* specified fallback value.
*/
def envOrElse(variable: => String, alt: => String)(implicit trace: Trace): IO[SecurityException, String] =
ZIO.succeed(unsafe.envOrElse(variable, alt)(Unsafe.unsafe))
/**
* Returns the specified environment variable if it exists or else the
* specified optional fallback value.
*/
def envOrOption(variable: => String, alt: => Option[String])(implicit
trace: Trace
): IO[SecurityException, Option[String]] =
ZIO.succeed(unsafe.envOrOption(variable, alt)(Unsafe.unsafe))
def envs(implicit trace: Trace): ZIO[Any, SecurityException, Map[String, String]] =
ZIO.succeed(unsafe.envs()(Unsafe.unsafe))
/**
* Returns the system line separator.
*/
def lineSeparator(implicit trace: Trace): UIO[String] =
ZIO.succeed(unsafe.lineSeparator()(Unsafe.unsafe))
def properties(implicit trace: Trace): ZIO[Any, Throwable, Map[String, String]] =
ZIO.succeed(unsafe.properties()(Unsafe.unsafe))
/**
* Returns the specified system property if it exists.
*/
def property(prop: => String)(implicit trace: Trace): IO[Throwable, Option[String]] =
ZIO.succeed(unsafe.property(prop)(Unsafe.unsafe))
/**
* Returns the specified system property if it exists or else the specified
* fallback value.
*/
def propertyOrElse(prop: => String, alt: => String)(implicit trace: Trace): IO[Throwable, String] =
ZIO.succeed(unsafe.propertyOrElse(prop, alt)(Unsafe.unsafe))
/**
* Returns the specified system property if it exists or else the specified
* optional fallback value.
*/
def propertyOrOption(prop: => String, alt: => Option[String])(implicit
trace: Trace
): IO[Throwable, Option[String]] =
ZIO.succeed(unsafe.propertyOrOption(prop, alt)(Unsafe.unsafe))
/**
* Adds the specified name and value to the mapping of environment variables
* maintained by this `TestSystem`.
*/
def putEnv(name: String, value: String)(implicit trace: Trace): UIO[Unit] =
systemState.update(data => data.copy(envs = data.envs.updated(name, value)))
/**
* Adds the specified name and value to the mapping of system properties
* maintained by this `TestSystem`.
*/
def putProperty(name: String, value: String)(implicit trace: Trace): UIO[Unit] =
systemState.update(data => data.copy(properties = data.properties.updated(name, value)))
/**
* Sets the system line separator maintained by this `TestSystem` to the
* specified value.
*/
def setLineSeparator(lineSep: String)(implicit trace: Trace): UIO[Unit] =
systemState.update(_.copy(lineSeparator = lineSep))
/**
* Clears the mapping of environment variables.
*/
def clearEnv(variable: String)(implicit trace: Trace): UIO[Unit] =
systemState.update(data => data.copy(envs = data.envs - variable))
/**
* Clears the mapping of system properties.
*/
def clearProperty(prop: String)(implicit trace: Trace): UIO[Unit] =
systemState.update(data => data.copy(properties = data.properties - prop))
/**
* Saves the `TestSystem``'s current state in an effect which, when run,
* will restore the `TestSystem` state to the saved state.
*/
def save(implicit trace: Trace): UIO[UIO[Unit]] =
for {
systemData <- systemState.get
} yield systemState.set(systemData)
override val unsafe: UnsafeAPI =
new UnsafeAPI {
override def env(variable: String)(implicit unsafe: Unsafe): Option[String] =
systemState.unsafe.get.envs.get(variable)
override def envOrElse(variable: String, alt: => String)(implicit unsafe: Unsafe): String =
System.envOrElseWith(variable, alt)(env)
override def envOrOption(variable: String, alt: => Option[String])(implicit unsafe: Unsafe): Option[String] =
System.envOrOptionWith(variable, alt)(env)
override def envs()(implicit unsafe: Unsafe): Map[String, String] =
systemState.unsafe.get.envs
override def lineSeparator()(implicit unsafe: Unsafe): String =
systemState.unsafe.get.lineSeparator
override def properties()(implicit unsafe: Unsafe): Map[String, String] =
systemState.unsafe.get.properties
override def property(prop: String)(implicit unsafe: Unsafe): Option[String] =
systemState.unsafe.get.properties.get(prop)
override def propertyOrElse(prop: String, alt: => String)(implicit unsafe: Unsafe): String =
System.propertyOrElseWith(prop, alt)(property)
override def propertyOrOption(prop: String, alt: => Option[String])(implicit
unsafe: Unsafe
): Option[String] =
System.propertyOrOptionWith(prop, alt)(property)
}
}
/**
* The default initial state of the `TestSystem` with no environment variable
* or system property mappings and the system line separator set to the new
* line character.
*/
val DefaultData: Data = Data(Map(), Map(), "\n")
/**
* Constructs a new `TestSystem` with the specified initial state. This can be
* useful for providing the required environment to an effect that requires a
* `Console`, such as with `ZIO#provide`.
*/
def live(data: Data): Layer[Nothing, TestSystem] = {
implicit val trace: Trace = Tracer.newTrace
ZLayer.scoped {
for {
ref <- ZIO.succeed(Ref.unsafe.make(data)(Unsafe.unsafe))
test = Test(ref)
_ <- ZIO.withSystemScoped(test)
} yield test
}
}
val any: ZLayer[TestSystem, Nothing, TestSystem] =
ZLayer.environment[TestSystem](Tracer.newTrace)
val default: Layer[Nothing, TestSystem] =
live(DefaultData)
/**
* Accesses a `TestSystem` instance in the environment and adds the specified
* name and value to the mapping of environment variables.
*/
def putEnv(name: => String, value: => String)(implicit trace: Trace): UIO[Unit] =
testSystemWith(_.putEnv(name, value))
/**
* Accesses a `TestSystem` instance in the environment and adds the specified
* name and value to the mapping of system properties.
*/
def putProperty(name: => String, value: => String)(implicit trace: Trace): UIO[Unit] =
testSystemWith(_.putProperty(name, value))
/**
* Accesses a `TestSystem` instance in the environment and saves the system
* state in an effect which, when run, will restore the `TestSystem` to the
* saved state
*/
def save(implicit trace: Trace): UIO[UIO[Unit]] =
testSystemWith(_.save)
/**
* Accesses a `TestSystem` instance in the environment and sets the line
* separator to the specified value.
*/
def setLineSeparator(lineSep: => String)(implicit trace: Trace): UIO[Unit] =
testSystemWith(_.setLineSeparator(lineSep))
/**
* Accesses a `TestSystem` instance in the environment and clears the mapping
* of environment variables.
*/
def clearEnv(variable: => String)(implicit trace: Trace): UIO[Unit] =
testSystemWith(_.clearEnv(variable))
/**
* Accesses a `TestSystem` instance in the environment and clears the mapping
* of system properties.
*/
def clearProperty(prop: => String)(implicit trace: Trace): UIO[Unit] =
testSystemWith(_.clearProperty(prop))
/**
* The state of the `TestSystem`.
*/
final case class Data(
properties: Map[String, String] = Map.empty,
envs: Map[String, String] = Map.empty,
lineSeparator: String = "\n"
)
}
