• A PostgreSQL database server running on port 5432, a database instance named postgres with a user postgres and an empty password

• Or a working Docker environment as described by [Testcontainers](https://www.testcontainers.org/usage.html#prerequisites).

If neither is provided all tests will get ignored, essentially disabling the examples. If you want to fail the build instead add -DignoreMissingInfrastructure=true

• InfrastructureConfiguration - sets up a R2DBC ConnectionFactory based on the R2DBC Postgres driver (r2dbc-postgresql), a DatabaseClient and a R2dbcRepositoryFactory to eventually create a CustomerRepository.

• CustomerRepository - a standard Spring Data reactive CRUD repository exposing query methods using manually defined queries

• CustomerRepositoryIntegrationTests - to initialize the database with some setup SQL and the inserting and reading Customer instances.