Vfrdtyky

The integration test of Spring boot application always starts the web server firstly.

The simplest test of spring boot test looks like below, how does migrate it using kotlintest instead?

@ExtendWith(SpringExtension::class)

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)

class ReportApplicationTests {



    @Test

    fun `Server can be launched`() {

    }



}

Here's how I've got it set up: firstly, make sure to reference JUnit 5 instead of 4, e.g. I've got this in the dependencies section of my build.gradle:

testImplementation "org.springframework.boot:spring-boot-starter-test:${springBootVersion}"

testImplementation "org.jetbrains.kotlin:kotlin-test"

testImplementation "org.jetbrains.kotlin:kotlin-test-junit"

testImplementation "io.kotlintest:kotlintest-extensions-spring:3.1.10"

testImplementation 'io.kotlintest:kotlintest-runner-junit5:3.1.10'

testImplementation "org.junit.jupiter:junit-jupiter-api:5.3.1"

testImplementation "org.junit.jupiter:junit-jupiter-engine:5.3.1"

Also add this to build.gradle:

test {

    useJUnitPlatform()

}

Then in your integration test class have this (notice the override of listeners, without which it won't work):

import org.springframework.boot.test.context.SpringBootTest

import io.kotlintest.spring.SpringListener



@SpringBootTest(

        webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT,

        classes = [MyApplication::class])

class MyTestStringSpec : StringSpec() {

    override fun listeners() = listOf(SpringListener)



    init {

        // Tests go in here

    }

}

Obviously you can replace StringSpec with any of the other Kotlin Test testing styles, e.g. FunSpec, ShouldSpec, etc.

Kotlintest have a very nice guide on how to setup Spring Extension to test Spring Framework.

Basically, in addition to KotlinTest dependency, you also add it's Spring Extension:

testImplementation ("io.kotlintest:kotlintest-runner-junit5:3.1.11") // KT dependency

testImplementation("io.kotlintest:kotlintest-extensions-spring:3.1.11") // KT Spring Extensions

And then you include the SpringListener and SpringBootTest to your code:

import org.springframework.boot.test.context.SpringBootTest

import io.kotlintest.spring.SpringListener



@SpringBootTest

class SpringExample : FreeSpec() {



    override fun listeners = listOf(SpringListener)



    init {

        "Verify context loads" {



        }

    }

}

You don't need to add SpringListener to every test you create, you can configure it globally using ProjectConfig. ProjectConfig is explained in KotlinTest Documentation