Discover AI-native insights at Testμ Conference‘25

How to use KotestTestRunner class of io.kotest.runner.junit4 package

Best Kotest code snippet using io.kotest.runner.junit4.KotestTestRunner

specs.kt

1package io.kotest.runner.junit42import org.junit.runner.RunWith3@RunWith(KotestTestRunner::class)4abstract class FunSpec(body: io.kotest.core.spec.style.FunSpec.() -> Unit = {}) :5   io.kotest.core.spec.style.FunSpec(body)6@RunWith(KotestTestRunner::class)7abstract class StringSpec(body: io.kotest.core.spec.style.StringSpec.() -> Unit = {}) :8   io.kotest.core.spec.style.StringSpec(body)9@RunWith(KotestTestRunner::class)10abstract class ShouldSpec(body: io.kotest.core.spec.style.ShouldSpec.() -> Unit = {}) :11   io.kotest.core.spec.style.ShouldSpec(body)12@RunWith(KotestTestRunner::class)13abstract class DescribeSpec(body: io.kotest.core.spec.style.DescribeSpec.() -> Unit = {}) :14   io.kotest.core.spec.style.DescribeSpec(body)15@RunWith(KotestTestRunner::class)16abstract class ExpectSpec(body: io.kotest.core.spec.style.ExpectSpec.() -> Unit = {}) :17   io.kotest.core.spec.style.ExpectSpec(body)18@RunWith(KotestTestRunner::class)19abstract class FeatureSpec(body: io.kotest.core.spec.style.FeatureSpec.() -> Unit = {}) :20   io.kotest.core.spec.style.FeatureSpec(body)21@RunWith(KotestTestRunner::class)22abstract class FreeSpec(body: io.kotest.core.spec.style.FreeSpec.() -> Unit = {}) :23   io.kotest.core.spec.style.FreeSpec(body)24@RunWith(KotestTestRunner::class)25abstract class WordSpec(body: io.kotest.core.spec.style.WordSpec.() -> Unit = {}) :26   io.kotest.core.spec.style.WordSpec(body)27@RunWith(KotestTestRunner::class)28abstract class BehaviorSpec(body: io.kotest.core.spec.style.BehaviorSpec.() -> Unit = {}) :29   io.kotest.core.spec.style.BehaviorSpec(body)...

KotestTestRunner.kt

Source: KotestTestRunner.kt

...9import kotlinx.coroutines.runBlocking10import org.junit.runner.Description11import org.junit.runner.Runner12import org.junit.runner.notification.RunNotifier13class KotestTestRunner(14   private val kclass: Class<out Spec>15) : Runner() {16   private val formatter = DefaultDisplayNameFormatter(ProjectConfiguration())17   override fun run(notifier: RunNotifier) {18      runBlocking {19         val listener = JUnitTestEngineListener(notifier)20         TestEngineLauncher(listener).withClasses(kclass.kotlin).launch()21      }22   }23   override fun getDescription(): Description {24      val spec = runBlocking { createAndInitializeSpec(kclass.kotlin, EmptyExtensionRegistry).getOrThrow() }25      val desc = Description.createSuiteDescription(spec::class.java)26      Materializer(ProjectConfiguration()).materialize(spec).forEach { rootTest ->27         desc.addChild(...

HelloWorldTest.kt

Source: HelloWorldTest.kt

2import io.kotest.core.spec.style.FreeSpec3import io.kotest.matchers.ints.shouldBeLessThan4import io.kotest.matchers.string.shouldContain5import io.kotest.matchers.string.shouldStartWith6import io.kotest.runner.junit4.KotestTestRunner7import org.junit.runner.RunWith8@RunWith(KotestTestRunner::class)9class HelloWorldTest : FreeSpec() {10    init {11        "First Test" {12            1.shouldBeLessThan(2)13        }14        "String tests #@!*!$" - {15            "substring" {16                "helloworld".shouldContain("world")17            }18            "startwith" {19                "hello".shouldStartWith("he")20            }21        }22    }...

KotestTestRunner

Using AI Code Generation

1@RunWith(KotestTestRunner::class)2class MySpec : StringSpec({3"test" {4}5})6@ExtendWith(KotestTestRunner::class)7class MySpec : StringSpec({8"test" {9}10})

KotestTestRunner

Using AI Code Generation

1@RunWith(KotestTestRunner::class)2class MyKotestTest {3class MySpec : StringSpec({4"test" {5}6})7}8val engine = KotestEngine()9engine.execute(MySpec::class)10}

KotestTestRunner

Using AI Code Generation

1import io.kotest.runner.junit4.KotestTestRunner2@RunWith(KotestTestRunner::class)3class MyTest()4}5fun test1() {6}7assertEquals(1, 1)8assertEquals(1, 2)9assertNotEquals(1, 2)10assertNotEquals(1, 1)11assertNull(null)12assertNull(1)13assertNotNull(1)14assertNotNull(null)15assertThat(1, is(1))16assertThat(1, is(2))17assertThat(1, not(2))

Blogs

Check out the latest blogs from LambdaTest on this topic:

How To Write End-To-End Tests Using Cypress App Actions

When I started writing tests with Cypress, I was always going to use the user interface to interact and change the application’s state when running tests.

Agile Testing is different – Here is what you need to know

Agile Testing is different- Here is what you need to know.og

Digital transformation – part 2 – Enterprise vs Startup

Digital transformation - part 2 - Enterprise vs Startup

How To Find Hidden Elements In Selenium WebDriver With Java

Have you ever struggled with handling hidden elements while automating a web or mobile application? I was recently automating an eCommerce application. I struggled with handling hidden elements on the web page.

Guide To Find Index Of Element In List with Python Selenium

In an ideal world, you can test your web application in the same test environment and return the same results every time. The reality can be difficult sometimes when you have flaky tests, which may be due to the complexity of the web elements you are trying to perform an action on your test case.

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.