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 magnolia

Definition Classes: test

package poly

Definition Classes: test

package refined

Definition Classes: test

package render

Definition Classes: test

package results

Definition Classes: test

package scalacheck

This package provides helpers to integrate *some* ScalaCheck primitives to their ZIO equivalents.

This package provides helpers to integrate *some* ScalaCheck primitives to their ZIO equivalents. Currently available helpers:

Converting ScalaCheck Generators to ZIO Generators
Asserting a ScalaCheck Prop with ZIO
Asserting a ScalaCheck Properties with ZIO

**Generators**

This functionality converts legacy ScalaCheck generators to ZIO Test generators to support upgrading to ZIO Test without having to reimplement existing generators. To use it import this module and then call toGenZIO on any existing ScalaCheck generator. For example:

import org.scalacheck.Arbitrary

import zio._
import zio.test._
import zio.test.scalacheck._

val anyInt: Gen[Any, Int] =
  Arbitrary.arbitrary[Int].toGenZIO

**Asserting ScalaCheck Prop and Properties**

This functionality generates ZIO Assertions from either ScalaCheck Prop or Properties. This helps with integrating other libraries that provide ScalaCheck properties as helpers, i.e. cats-laws.

Prop example:

import org.scalacheck.Prop
import org.scalacheck.Test.{ Parameters => ScalaCheckParameters }

import zio._
import zio.test._
import zio.test.scalacheck._

val prop: Prop = Prop.forAll { (n: Int, m: Int) =>
  n + m == m + n
}
val resultDefault: TestResult = prop.assertZIO()

val resultWithCustomizations: TestResult =
  prop.assertZIO("My Prop Name", ScalaCheckParameters.default.withMaxSize(10))

Properties example:

import org.scalacheck.{ Prop, Properties }
import org.scalacheck.Test.{ Parameters => ScalaCheckParameters }

import zio._
import zio.test._
import zio.test.scalacheck._

object MyProperties extends Properties("MyProperties") {
  property("myProp") = Prop.forAll { (n: Int, m: Int) =>
    n + m == m + n
  }
}

* val resultDefault: TestResult = MyProperties.assertZIO()

// Beware that we can't provide a custom name here, it will be
// taken from the `Properties` name parameter
val resultWithCustomizations: TestResult =
  MyProperties.assertZIO(ScalaCheckParameters.default.withMaxSize(10))

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

Sample

Companion object Sample

final case class Sample[-R, +A](value: A, shrink: ZStream[R, Nothing, Sample[R, A]]) extends Product with Serializable

A sample is a single observation from a random variable, together with a tree of "shrinkings" used for minimization of "large" failures.

Self Type: Sample[R, A]

Linear Supertypes

Serializable, Product, Equals, AnyRef, Any

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Instance Constructors

new Sample(value: A, shrink: ZStream[R, Nothing, Sample[R, A]])

Value Members

final def !=(arg0: Any): Boolean
Definition Classes
AnyRef → Any
final def ##: Int
Definition Classes
AnyRef → Any
def <*>[R1 <: R, B](that: Sample[R1, B])(implicit zippable: Zippable[A, B], trace: Trace): Sample[R1, Out]
A symbolic alias for zip.
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 filter(f: (A) => Boolean)(implicit trace: Trace): ZStream[R, Nothing, Sample[R, A]]
Filters this sample by replacing it with its shrink tree if the value does not meet the specified predicate and recursively filtering the shrink tree.
def flatMap[R1 <: R, B](f: (A) => Sample[R1, B])(implicit trace: Trace): Sample[R1, B]
def foreach[R1 <: R, B](f: (A) => ZIO[R1, Nothing, B])(implicit trace: Trace): ZIO[R1, Nothing, Sample[R1, B]]
final def getClass(): Class[_ <: AnyRef]
Definition Classes
AnyRef → Any
Annotations
@native()
final def isInstanceOf[T0]: Boolean
Definition Classes
Any
def map[B](f: (A) => B)(implicit trace: Trace): Sample[R, B]
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()
def productElementNames: Iterator[String]
Definition Classes
Product
val shrink: ZStream[R, Nothing, Sample[R, A]]
def shrinkSearch(f: (A) => Boolean)(implicit trace: Trace): ZStream[R, Nothing, A]
Converts the shrink tree into a stream of shrinkings by recursively searching the shrink tree, using the specified function to determine whether a value is a failure.
Converts the shrink tree into a stream of shrinkings by recursively searching the shrink tree, using the specified function to determine whether a value is a failure. The resulting stream will contain all values explored, regardless of whether they are successes or failures.
final def synchronized[T0](arg0: => T0): T0
Definition Classes
AnyRef
val value: A
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()
def zip[R1 <: R, B](that: Sample[R1, B])(implicit zippable: Zippable[A, B], trace: Trace): Sample[R1, Out]
Composes this sample with the specified sample to create a cartesian product of values and shrinkings.
def zipWith[R1 <: R, B, C](that: Sample[R1, B])(f: (A, B) => C)(implicit trace: Trace): Sample[R1, C]
Composes this sample with the specified sample to create a cartesian product of values and shrinkings with the specified function.

Deprecated Value Members

def finalize(): Unit
Attributes
protected[lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.Throwable]) @Deprecated
Deprecated
(Since version 9)

Packages

Sample

Companion object Sample

final case class Sample[-R, +A](value: A, shrink: ZStream[R, Nothing, Sample[R, A]]) extends Product with Serializable

Instance Constructors

Value Members

Deprecated Value Members

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

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Packages

Sample

Companion object Sample

final case class Sample[-R, +A](value: A, shrink: ZStream[R, Nothing, Sample[R, A]]) extends Product with Serializable

Instance Constructors

Value Members

Deprecated Value Members

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

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Sample