testcontainer kotlin + mysql example

build.gradle

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
    implementation 'org.springframework.boot:spring-boot-starter-web'
    implementation 'com.fasterxml.jackson.module:jackson-module-kotlin'
    implementation 'org.jetbrains.kotlin:kotlin-reflect'
    runtimeOnly 'com.mysql:mysql-connector-j'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
    testImplementation 'org.springframework.boot:spring-boot-testcontainers'
    testImplementation 'org.jetbrains.kotlin:kotlin-test-junit5'
    testImplementation 'org.testcontainers:junit-jupiter'
    testImplementation 'org.testcontainers:mysql'
    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
}

PersonControllerTest.kt

@Testcontainers
@Import(TestcontainersConfiguration::class)
class PersonControllerTest {
    @Autowired
    private lateinit var personRepository: PersonRepository
    
    @Test
    fun given_when_then() {
        val persons = personRepository.findAll()
        assertThat(persons).isEmpty()
        personRepository.save(Person("joonseo", 20))
        val newPersons = personRepository.findAll()
        assertThat(newPersons).hasSize(1)
    }
}

TestcontainersConfiguration.kt

@TestConfiguration(proxyBeanMethods = false)
class TestcontainersConfiguration {

    @Bean
    @ServiceConnection
    fun mysqlContainer(): MySQLContainer<*> {
        return MySQLContainer(DockerImageName.parse("mysql:latest"))
    }
}