02 – Testcontainers with PostgreSQL

Theory

Container lifecycle

Task

Full Working Code

`src/test/java/com/example/demo/repository/OrderRepositoryPostgresTest.java`

`.testcontainers.properties` (optional — for container reuse)

`src/test/java/com/example/demo/repository/AbstractPostgresTest.java` (singleton pattern)

`build.gradle` (testcontainers dependencies)

Expected Output

Verification Steps