Initialise MySQL Testcontainer using R2DBC and Jooq - testcontainers

Question

I want to write integration test for my microservice currently using Kotlin, Jooq and R2dbc at repository level.
I want my test to work in R2dbc mode as well, but for some reason getting this exception:
Caused by: org.testcontainers.containers.JdbcDatabaseContainer$NoDriverFoundException: Could not get Driver
at org.testcontainers.containers.JdbcDatabaseContainer.getJdbcDriverInstance(JdbcDatabaseContainer.java:187)
at org.testcontainers.containers.JdbcDatabaseContainer.createConnection(JdbcDatabaseContainer.java:209)
at org.testcontainers.containers.JdbcDatabaseContainer.waitUntilContainerStarted(JdbcDatabaseContainer.java:147)
at org.testcontainers.containers.GenericContainer.tryStart(GenericContainer.java:466)
... 10 common frames omitted
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
Probably, I have to point somewhere that I want to use r2dbc only, not jdbc? I've seen the specs but not sure whether I applied TC_INITSCRIPT and TC_IMAGE_TAG correctly.
I don't use Spring Data r2dbc (jooq only), that's why ResourceDatabasePopulator is not an option for me.
My test looks like:
#SpringBootTest(classes = [UserServiceApp::class])
#ActiveProfiles(profiles = ["test"])
#AutoConfigureWebTestClient
class UserServiceAppIT(#Autowired val client: WebTestClient) {
#Nested
inner class Find {
#Test
#DisplayName("Find existing user by id")
fun `existing user credentials returns OK`() {
val expectedUser = getCredentialsUser() //this is a class with expected data
val response = client.get()
.uri("/user/2") //this is my endpoint
.accept(MediaType.APPLICATION_JSON)
.exchange()
.expectStatus().isOk
.expectBody(UserCredentialsModel::class.java)
.returnResult()
.responseBody
assertThat(response)
.isNotNull
.isEqualTo(expectedUser)
}
}
Test config in yaml file:
server.port: 8080
spring:
application:
name: User Service Test
r2dbc:
url: r2dbc:tc:mysql:///pharmacy?TC_IMAGE_TAG=8.0.26&TC_INITSCRIPT=classpath/resources/init.sql
password: root
username: root
pool:
initial-size: 1
max-size: 10
max-idle-time: 30m
Dependencies (gradle):
buildscript {
ext {
springDependencyVersion = '1.0.11.RELEASE'
springBootVersion = '2.5.3'
kotlinVersion = '1.5.0'
jooqPluginVersion = '6.0'
springdocVersion = '1.5.10'
r2dbcMySQLVersion = '0.8.2.RELEASE'
r2dbcPoolVersion = '0.8.7.RELEASE'
mockKVersion = '1.12.0'
kotestVersion = '4.4.3'
kotlinJsonVersion = '1.2.1'
kotlinDateVersion = '0.2.1'
testcontainersVersion = '1.16.0'
}
}

Answer 1

It is easy to integrate Jooq with R2dbc.
#Configuration
class JooqConfig {
#Bean
fun dslContext(connectionFactory: ConnectionFactory) =
using(TransactionAwareConnectionFactoryProxy(connectionFactory), SQLDialect.POSTGRES)
}
NOTE: Do not include Jooq starter if you are using Spring 2.7.x. The Jooq autoconfiguration only supports Jdbc.
An example using Jooq.
class PostRepositoryImpl(private val dslContext: DSLContext) : PostRepositoryCustom {
override fun findByKeyword(title: String): Flow<PostSummary> {
val sql = dslContext
.select(
POSTS.ID,
POSTS.TITLE,
field("count(comments.id)", SQLDataType.BIGINT)
)
.from(
POSTS
.leftJoin(COMMENTS.`as`("comments"))
.on(COMMENTS.POST_ID.eq(POSTS.ID))
)
.where(
POSTS.TITLE.like("%$title%")
.and(POSTS.CONTENT.like("%$title%"))
.and(COMMENTS.CONTENT.like("%$title%"))
)
.groupBy(POSTS.ID)
return Flux.from(sql)
.map { r -> PostSummary(r.value1(), r.value2(), r.value3()) }
.asFlow();
}
override suspend fun countByKeyword(title: String): Long {
val sql = dslContext
.select(
DSL.field("count(distinct(posts.id))", SQLDataType.BIGINT)
)
.from(
POSTS
.leftJoin(COMMENTS.`as`("comments"))
.on(COMMENTS.POST_ID.eq(POSTS.ID))
)
.where(
POSTS.TITLE.like("%$title%")
.and(POSTS.CONTENT.like("%$title%"))
.and(COMMENTS.CONTENT.like("%$title%"))
)
return Mono.from(sql).map { it.value1() ?: 0 }.awaitSingle()
}
}
TestContainers database requires a Jdbc driver, add MySQL Jdbc driver with testcontainter into your test scope.
The following is an example using Postgres and Testcontainers.
#OptIn(ExperimentalCoroutinesApi::class)
#Testcontainers
#DataR2dbcTest()
#Import(JooqConfig::class, R2dbcConfig::class)
class PostRepositoriesTest {
companion object {
private val log = LoggerFactory.getLogger(PostRepositoriesTest::class.java)
#Container
val postgreSQLContainer = PostgreSQLContainer("postgres:12")
.withCopyFileToContainer(
MountableFile.forClasspathResource("/init.sql"),
"/docker-entrypoint-initdb.d/init.sql"
)
#JvmStatic
#DynamicPropertySource
fun registerDynamicProperties(registry: DynamicPropertyRegistry) {
registry.add("spring.r2dbc.url") {
"r2dbc:postgresql://${postgreSQLContainer.host}:${postgreSQLContainer.firstMappedPort}/${postgreSQLContainer.databaseName}"
}
registry.add("spring.r2dbc.username") { postgreSQLContainer.username }
registry.add("spring.r2dbc.password") { postgreSQLContainer.password }
}
}
#Autowired
lateinit var postRepository: PostRepository
#Autowired
lateinit var dslContext: DSLContext
#BeforeEach
fun setup() = runTest {
log.info(" clear sample data ...")
val deletedPostsCount = Mono.from(dslContext.deleteFrom(POSTS)).awaitSingle()
log.debug(" deletedPostsCount: $deletedPostsCount")
}
#Test
fun `query sample data`() = runTest {
log.debug(" add new sample data...")
val insertPostSql = dslContext.insertInto(POSTS)
.columns(POSTS.TITLE, POSTS.CONTENT)
.values("jooq test", "content of Jooq test")
.returningResult(POSTS.ID)
val postId = Mono.from(insertPostSql).awaitSingle()
log.debug(" postId: $postId")
val insertCommentSql = dslContext.insertInto(COMMENTS)
.columns(COMMENTS.POST_ID, COMMENTS.CONTENT)
.values(postId.component1(), "test comments")
.values(postId.component1(), "test comments 2")
val insertedCount = Mono.from(insertCommentSql).awaitSingle()
log.info(" insertedCount: $insertedCount")
val querySQL = dslContext
.select(
POSTS.TITLE,
POSTS.CONTENT,
multiset(
select(COMMENTS.CONTENT)
.from(COMMENTS)
.where(COMMENTS.POST_ID.eq(POSTS.ID))
).`as`("comments")
)
.from(POSTS)
.orderBy(POSTS.CREATED_AT)
Flux.from(querySQL).asFlow()
.onEach { log.info("querySQL result: $it") }
.collect()
val posts = postRepository.findByKeyword("test").toList()
posts shouldNotBe null
posts.size shouldBe 1
posts[0].commentsCount shouldBe 2
postRepository.countByKeyword("test") shouldBe 1
}
// other tests
My example project is based Postgres, R2dbc, And Spring Data R2dbc: https://github.com/hantsy/spring-r2dbc-sample/blob/master/jooq-kotlin-co-gradle