How to use Testcontainers with spring 5 and Junit Jupiter 5

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I’ve learned the hard way that using an Integration test database different than the Production database is a not so good experience.

Hence I decided to use the same database in my next project.

So I am trying to use PostgreSQL database in Integration tests, and I am trying to use it via Testcontainers.

It is a typical spring boot project (2.2.0) which comes by default with JUnit Jupiter 5.

Let's start with the pom.xml

<dependency>
    <groupId>org.testcontainers</groupId>
    <artifactId>junit-jupiter</artifactId>
    <version>1.11.4</version>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>org.testcontainers</groupId>
    <artifactId>postgresql</artifactId>
    <version>1.11.4</version>
    <scope>test</scope>
</dependency>

And I’ve created a static reference to my container:

import org.testcontainers.containers.PostgreSQLContainer as LibPostgreSQLContainer

val sharedPostgreSQLContainer = PostgreSQLContainer()

class PostgreSQLContainer :
        LibPostgreSQLContainer<PostgreSQLContainer>("postgres:11.4-alpine") {

    override fun start() {
        super.start()
        System.setProperty("spring.datasource.url", sharedPostgreSQLContainer.jdbcUrl)
        System.setProperty("spring.datasource.username", sharedPostgreSQLContainer.username)
        System.setProperty("spring.datasource.password", sharedPostgreSQLContainer.password)
    }
}

And in Spring Test I am referring to this shared instance:

@SpringBootTest
@Testcontainers
class ApplicationTests {

    companion object {
        @Container
        val postgreSQLContainer = sharedPostgreSQLContainer
    }

    @Test
    fun contextLoads() {
    }

}

That’s all folks.

References:

Jupiter / JUnit 5 - Testcontainers

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