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

TestConfig

Companion object TestConfig

trait TestConfig extends Serializable

The TestConfig service provides access to default configuration settings used by ZIO Test, including the number of times to repeat tests to ensure they are stable, the number of times to retry flaky tests, the sufficient number of samples to check from a random variable, and the maximum number of shrinkings to minimize large failures.

Linear Supertypes

Serializable, AnyRef, Any

Known Subclasses

Test

Ordering

Alphabetic
By Inheritance

Inherited

TestConfig
Serializable
AnyRef
Any

Hide All
Show All

Visibility

Public
Protected

Abstract Value Members

abstract def repeats: Int
The number of times to repeat tests to ensure they are stable.
abstract def retries: Int
The number of times to retry flaky tests.
abstract def samples: Int
The number of sufficient samples to check for a random variable.
abstract def shrinks: Int
The maximum number of shrinkings to minimize large failures

Concrete Value Members

final def !=(arg0: Any): Boolean
Definition Classes
AnyRef → Any
final def ##: Int
Definition Classes
AnyRef → Any
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 eq(arg0: AnyRef): Boolean
Definition Classes
AnyRef
def equals(arg0: AnyRef): Boolean
Definition Classes
AnyRef → Any
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 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
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

TestConfig

Companion object TestConfig

trait TestConfig extends Serializable

Abstract Value Members

Concrete Value Members

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

Ungrouped

Packages

TestConfig

Companion object TestConfig

trait TestConfig extends Serializable

Abstract Value Members

Concrete Value Members

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

Ungrouped

TestConfig