Packages

Definition Classes: root

Definition Classes: root

_ZIO Test_ is a featherweight testing library for effectful programs.

The library imagines every spec as an ordinary immutable value, providing tremendous potential for composition. Thanks to tight integration with ZIO, specs can use resources (including those requiring disposal), have well- defined linear and parallel semantics, and can benefit from a host of ZIO combinators.

import zio.test._
import zio.Clock.nanoTime

object MyTest extends ZIOSpecDefault {
  def spec = suite("clock")(
    test("time is non-zero") {
      for {
        time <- Live.live(nanoTime)
      } yield assertTrue(time >= 0L)
    }
  )
}

Definition Classes: zio

package diff

Definition Classes: test

package internal

Definition Classes: test

package laws

The laws package provides functionality for describing laws as values.

The laws package provides functionality for describing laws as values. The fundamental abstraction is a set of ZLaws[Caps, R]. These laws model the laws that instances having a capability of type Caps are expected to satisfy. A capability Caps[_] is an abstraction describing some functionality that is common across different data types and obeys certain laws. For example, we can model the capability of two values of a type being compared for equality as follows:

trait Equal[-A] {
  def equal(a1: A, a2: A): Boolean
}

Definitions of equality are expected to obey certain laws:

Reflexivity - a1 === a1
Symmetry - a1 === a2 ==> a2 === a1
Transitivity - (a1 === a2) && (a2 === a3) ==> (a1 === a3)

These laws define what the capabilities mean and ensure that it is safe to abstract across different instances with the same capability.

Using ZIO Test, we can represent these laws as values. To do so, we define each law using one of the ZLaws constructors. For example:

val transitivityLaw = ZLaws.Laws3[Equal]("transitivityLaw") {
  def apply[A: Equal](a1: A, a2: A, a3: A): TestResult =
    ???
}

We can then combine laws using the + operator:

val reflexivityLaw: = ???
val symmetryLaw:    = ???

val equalLaws = reflexivityLaw + symmetryLaw + transitivityLaw

Laws have a run method that takes a generator of values of type A and checks that those values satisfy the laws. In addition, objects can extend ZLawful to provide an even more convenient syntax for users to check that instances satisfy certain laws.

object Equal extends Lawful[Equal]

object Hash extends Lawful[Hash]

object Ord extends Lawful[Ord]

checkAllLaws(Equal + Hash + Ord)(Gen.int)

Note that capabilities compose seamlessly because of contravariance. We can combine laws describing different capabilities to construct a set of laws requiring that instances having all of the capabilities satisfy each of the laws.

Definition Classes: test

package poly

Definition Classes: test

package render

Definition Classes: test

package results

Definition Classes: test

CheckConstructorLowPriority1

CheckConstructorLowPriority2

CheckConstructorLowPriority3

Eql

Gen

PrettyPrintVersionSpecific

ProvideSomePartiallyApplied

ProvideSomeSharedPartiallyApplied

ReporterEventRenderer

SuiteConstructorLowPriority1

SuiteConstructorLowPriority2

SuiteConstructorLowPriority3

SuiteConstructorLowPriority4

TestAnnotationRenderer

TestClockPlatformSpecific

TestConfig

TestConsole

TestConstructor

TestConstructorLowPriority1

TestConstructorLowPriority2

TestConstructorLowPriority3

ZIOSpecAbstractVersionSpecific

ZIOSpecDefault

ZIOSpecVersionSpecific

ZTestLogger

Companion object ZTestLogger

sealed trait ZTestLogger[-Message, +Output] extends ZLogger[Message, Output]

A ZTestLogger is an implementation of a ZLogger that writes all log messages to an internal data structure. The contents of this data structure can be accessed using the logOutput operator. This makes it easy to write tests to verify that expected messages are being logged.

test("logging works") {
  for {
    _      <- ZIO.logDebug("It's alive!")
    output <- ZTestLogger.logOutput
  } yield assertTrue(output.length == 1) &&
    assertTrue(output(0).message() == "It's alive!") &&
    assertTrue(output(0).logLevel == LogLevel.Debug)
}

Linear Supertypes

ZLogger[Message, Output], AnyRef, Any

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Abstract Value Members

abstract def apply(trace: Trace, fiberId: FiberId, logLevel: LogLevel, message: () => Message, cause: Cause[Any], context: FiberRefs, spans: List[LogSpan], annotations: Map[String, String]): Output
Definition Classes
ZLogger
abstract def logOutput: UIO[Chunk[LogEntry]]
Returns the contents of the log.

Concrete Value Members

final def !=(arg0: Any): Boolean
Definition Classes
AnyRef → Any
final def ##: Int
Definition Classes
AnyRef → Any
def ++[M <: Message, O](that: ZLogger[M, O])(implicit zippable: Zippable[Output, O]): ZLogger[M, Out]
Definition Classes
ZLogger
def +>[M <: Message, O](that: ZLogger[M, O]): ZLogger[M, O]
Definition Classes
ZLogger
def <+[M <: Message](that: ZLogger[M, Any]): ZLogger[M, Output]
Definition Classes
ZLogger
final def ==(arg0: Any): Boolean
Definition Classes
AnyRef → Any
final def asInstanceOf[T0]: T0
Definition Classes
Any
def clone(): AnyRef
Attributes
protected[lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.CloneNotSupportedException]) @native()
final def contramap[Message1](f: (Message1) => Message): ZLogger[Message1, Output]
Definition Classes
ZLogger
final def eq(arg0: AnyRef): Boolean
Definition Classes
AnyRef
def equals(arg0: AnyRef): Boolean
Definition Classes
AnyRef → Any
final def filterLogLevel(f: (LogLevel) => Boolean): ZLogger[Message, Option[Output]]
Definition Classes
ZLogger
def finalize(): Unit
Attributes
protected[lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.Throwable])
final def getClass(): Class[_ <: AnyRef]
Definition Classes
AnyRef → Any
Annotations
@native()
def hashCode(): Int
Definition Classes
AnyRef → Any
Annotations
@native()
final def isInstanceOf[T0]: Boolean
Definition Classes
Any
final def map[B](f: (Output) => B): ZLogger[Message, B]
Definition Classes
ZLogger
final def ne(arg0: AnyRef): Boolean
Definition Classes
AnyRef
final def notify(): Unit
Definition Classes
AnyRef
Annotations
@native()
final def notifyAll(): Unit
Definition Classes
AnyRef
Annotations
@native()
final def synchronized[T0](arg0: => T0): T0
Definition Classes
AnyRef
final def test(input: => Message): Output
Definition Classes
ZLogger
def toString(): String
Definition Classes
AnyRef → Any
final def wait(): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
final def wait(arg0: Long, arg1: Int): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
final def wait(arg0: Long): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException]) @native()

Packages

ZTestLogger

Companion object ZTestLogger

sealed trait ZTestLogger[-Message, +Output] extends ZLogger[Message, Output]

Abstract Value Members

Concrete Value Members

Inherited from ZLogger[Message, Output]

Inherited from AnyRef

Inherited from Any

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Packages

ZTestLogger

Companion object ZTestLogger

sealed trait ZTestLogger[-Message, +Output] extends ZLogger[Message, Output]

Abstract Value Members

Concrete Value Members

Inherited from ZLogger[Message, Output]

Inherited from AnyRef

Inherited from Any

Ungrouped

ZTestLogger