composite-build-usage-example

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package by.andd3dfx.templateapp;
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import org.springframework.context.ApplicationContextInitializer;
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import org.springframework.context.ConfigurableApplicationContext;
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import org.springframework.core.env.ConfigurableEnvironment;
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import org.springframework.core.env.MapPropertySource;
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import org.testcontainers.containers.PostgreSQLContainer;
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import org.testcontainers.lifecycle.Startables;
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import java.util.Map;
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import java.util.stream.Stream;
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/**
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 * According to https://reflectoring.io/spring-boot-flyway-testcontainers/
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 */
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public class IntegrationTestInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {
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    private static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:16-alpine");
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    @Override
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    public void initialize(ConfigurableApplicationContext applicationContext) {
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        startContainers();
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        ConfigurableEnvironment environment = applicationContext.getEnvironment();
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        MapPropertySource propertySource = new MapPropertySource(
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                "test-containers", (Map) createConnectionConfiguration()
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        );
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        environment.getPropertySources().addFirst(propertySource);
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    }
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    private static void startContainers() {
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        Startables.deepStart(Stream.of(postgres)).join();
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        // we can add further containers
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        // here like rabbitmq or other databases
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    }
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    private static Map<String, String> createConnectionConfiguration() {
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        return Map.of(
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                "DB_URL", postgres.getJdbcUrl(),
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                "DB_USERNAME", postgres.getUsername(),
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                "DB_PASSWORD", postgres.getPassword(),
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                "DRIVER_CLASS_NAME", postgres.getDriverClassName()
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        );
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    }
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}
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