Packages

•  package root

  Definition Classes

  root

•  package zio

  Definition Classes

  root

•  package test

  _ZIO Test_ is a featherweight testing library for effectful programs.

  _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:

  1. Reflexivity - a1 === a1
  2. Symmetry - a1 === a2 ==> a2 === a1
  3. 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

• ScalaCheckGenSyntax
• ScalaCheckPropSyntax
• ScalaCheckPropertiesSyntax

zio.test

scalacheck