Spring Rest Docs documentationConfiguration with JUnit5 and Kotlin

CustomerRestDocs.kt

package io.license.core.restdocs

import org.junit.jupiter.api.BeforeAll
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.TestInstance
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.test.autoconfigure.restdocs.AutoConfigureRestDocs
import org.springframework.boot.test.context.SpringBootTest
import org.springframework.restdocs.RestDocumentationContextProvider
import org.springframework.restdocs.headers.HeaderDocumentation.headerWithName
import org.springframework.restdocs.headers.HeaderDocumentation.requestHeaders
import org.springframework.restdocs.mockmvc.MockMvcRestDocumentation.document
import org.springframework.restdocs.mockmvc.MockMvcRestDocumentation.documentationConfiguration
import org.springframework.restdocs.operation.preprocess.Preprocessors.preprocessResponse
import org.springframework.restdocs.operation.preprocess.Preprocessors.prettyPrint
import org.springframework.security.test.web.servlet.setup.SecurityMockMvcConfigurers.springSecurity
import org.springframework.test.context.ActiveProfiles
import org.springframework.test.web.servlet.MockMvc
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders
import org.springframework.test.web.servlet.result.MockMvcResultMatchers
import org.springframework.test.web.servlet.setup.DefaultMockMvcBuilder
import org.springframework.test.web.servlet.setup.MockMvcBuilders
import org.springframework.web.context.WebApplicationContext


@SpringBootTest
@AutoConfigureRestDocs
@ActiveProfiles("dev", "test")
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class CustomerRestDocs {

    lateinit var mvc: MockMvc

    @Autowired
    lateinit var restDocumentationContextProvider: RestDocumentationContextProvider

    @Autowired
    lateinit var webApplicationContext: WebApplicationContext

    internal val BEARER_HEADER = "Bearer HUm2W6vzhKda_OpmbsLIdA"


    @BeforeAll
    fun before() {

        this.mvc = MockMvcBuilders.webAppContextSetup(webApplicationContext)
                .apply<DefaultMockMvcBuilder>(documentationConfiguration(restDocumentationContextProvider).uris()
                        .withScheme("https")
                        .withHost("api.license.io")
                        .withPort(443)
                )
                .apply<DefaultMockMvcBuilder>(springSecurity())
                .build()
    }

    @Test
    fun listCustomers() {
        this.mvc.perform(MockMvcRequestBuilders.get("/api/v1/customers")
                .header("Authorization", BEARER_HEADER)
                .accept("application/hal+json"))
                .andExpect(MockMvcResultMatchers.status().isOk)

                .andDo(document("list-customers",
                        preprocessResponse(prettyPrint()),
                        requestHeaders(
                                headerWithName("Authorization").description("Bearer token credentials"))
                ))


    }


}