ApplicationTests.kt

// ...
@Test @Transactional @Rollback fun getZeroBookings() = get("/${organization1.slug}/${resource1.slug}/2020/04/1/1", status().isOk, jsonPath("$", hasSize<Resource>(0)))
@Test @Transactional @Rollback fun getThreeBookings() = get("/${organization1.slug}/${resource1.slug}/2020/04/1/7", status().isOk, jsonPath("$", hasSize<Resource>(3)))
@Test @Transactional @Rollback fun getBookingsWithBadDate() = get("/${organization1.slug}/${resource1.slug}/2020/04/31/7", status().isBadRequest)

// Wrapper around MockMvc

private fun post(url: String, model: Any?, vararg matchers: ResultMatcher) = test(POST, url, model, *matchers)
private fun patch(url: String, model: Any?, vararg matchers: ResultMatcher) = test(PATCH, url, model, *matchers)
private fun get(url: String, vararg matchers: ResultMatcher) = test(GET, url, null, *matchers)
private fun delete(url: String, vararg matchers: ResultMatcher) = test(DELETE, url, null, *matchers)
private fun test(httpMethod: HttpMethod, url: String, model: Any?, vararg matchers: ResultMatcher) {
    val builder = when (httpMethod) {
        POST -> MockMvcRequestBuilders.post(url)
        PATCH -> MockMvcRequestBuilders.patch(url)
        DELETE -> MockMvcRequestBuilders.delete(url)
        else -> MockMvcRequestBuilders.get(url)
    }.contentType(MediaType.APPLICATION_JSON).accept(MediaType.APPLICATION_JSON)
    if (model != null) builder.content(try {
        ObjectMapper().findAndRegisterModules().writeValueAsString(model)
    } catch (e: Exception) {
        throw RuntimeException(e)
    })
    val actions =  mvc.perform(builder)
    matchers.forEach { actions.andExpect(it) }
}