Testing

The axon-kotlin-test module adds extension functions to the test fixture. They live in the org.axonframework.extension.kotlin.test package.

`whenever`

when is a reserved word in Kotlin, so the fixture’s when() method needs backticks. whenever replaces it on both the setup and the given phase:

Function Equivalent

Function	Equivalent
`whenever()`	`when()`
`whenever(command)`	`when().command(command)`

whenever()

when()

whenever(command)

when().command(command)

`exception`

On the assertions of the then phase, exception accepts a KClass instead of a Class:

exception(KClass<out Throwable>)
exception(KClass<out Throwable>, message: String)

import org.axonframework.extension.kotlin.test.exception
import org.axonframework.extension.kotlin.test.whenever
import org.axonframework.test.fixture.AxonTestFixture
import org.junit.jupiter.api.Test

class CardTest {

    private lateinit var fixture: AxonTestFixture

    @Test
    fun `issuing an existing card fails`() {
        fixture.given()
            .event(CardIssued("card-1"))
            .whenever(IssueCard("card-1"))
            .then()
            .exception(IllegalStateException::class, "Card already issued")
    }
}