Kotest

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Kotest

Kotest Logo
Developer(s)	Stephen Samuel, Leonardo Colman, Emil Kantis, Ashish Joy and others
Stable release	5.6.2 / May 10, 2023 (2023-05-10)
Written in	Kotlin
Engine
Operating system	Cross-platform
Type	Unit testing tool
License	Apache License 2.0
Website	kotest.io

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Kotest is a unit testing framework for the Kotlin Programming Language, heavily inspired by Junit, ScalaTest, Cucumber and others.

Test Styles

Kotest features many test styles, most inspired by previous technology and practices, such as ScalaTest, JavaScript, RSpec, Cucumber and JUnit

FunSpec

Inspired by ScalaTest

class MyTests : FunSpec({
    test("String length should return the length of the string") {
        "sammy".length shouldBe 5
        "".length shouldBe 0
    }
})

DescribeSpec

Inspired by JavaScript and RSpec

class MyTests : DescribeSpec({
    describe("score") {
        it("start as zero") {
            // test here
        }
        describe("with a strike") {
            it("adds ten") {
                // test here
            }
            it("carries strike to the next frame") {
                // test here
            }
        }

        describe("for the opposite team") {
            it("Should negate one score") {
                // test here
            }
        }
    }
})

BehaviorSpec

Inspired by Behavior Driven Development

class MyTests : BehaviorSpec({
    given("a broomstick") {
        `when`("I sit on it") {
            then("I should be able to fly") {
                // test code
            }
        }
        `when`("I throw it away") {
            then("it should come back") {
                // test code
            }
        }
    }
})

FreeSpec

Inspired by ScalaTest

class MyTests : FreeSpec({
    "String.length" - {
        "should return the length of the string" {
            "sammy".length shouldBe 5
            "".length shouldBe 0
        }
    }
    "containers can be nested as deep as you want" - {
        "and so we nest another container" - {
            "yet another container" - {
                "finally a real test" {
                    1 + 1 shouldBe 2
                }
            }
        }
    }
})

WordSpec

Inspired by ScalaTest

class MyTests : WordSpec({
    "String.length" should {
        "return the length of the string" {
            "sammy".length shouldBe 5
            "".length shouldBe 0
        }
    }
})

FeatureSpec

Inspired by Cucumber

class MyTests : FeatureSpec({
    feature("the can of coke") {
        scenario("should be fizzy when I shake it") {
            // test here
        }
        scenario("and should be tasty") {
            // test here
        }
    }
})

AnnotationSpec

Inspired by JUnit

class AnnotationSpecExample : AnnotationSpec() {

    @BeforeEach
    fun beforeTest() {
        println("Before each test")
    }

    @Test
    fun test1() {
        1 shouldBe 1
    }

    @Test
    fun test2() {
        3 shouldBe 3
    }
}

See Also

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• JUnit
• ScalaTest
• Cucumber
• RSpec

History

KotlinTest

Up to version 4.0 Kotest was called KotlinTest. In February 2019 a rebrand was discussed, being completed and released in March 2020.

• 

  KotlinTest logo from 2018

External links

• Official website

This article "Kotest" is from Wikipedia. The list of its authors can be seen in its historical and/or the page Edithistory:Kotest. Articles copied from Draft Namespace on Wikipedia could be seen on the Draft Namespace of Wikipedia and not main one.

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