Configure specific in memory database for testing purpose in Spring

Question

How do I configure my Spring Boot application so that when I run unit tests it will use in-memory database such as H2/HSQL but when I run Spring Boot application it will use

Answer 1

@Sanjay has one way to put it but I find it confusing. You could just as well have only a production profile that you enable when you're in production, something like:

spring.jpa.hibernate.ddl-auto: update
spring.datasource.url: jdbc:mysql://localhost:3306/dbname
spring.datasource.username: username
spring.datasource.password: password

And don't specify anything else. If you add an embedded database in test scope, it will be available in your tests. If you run your tests with the default profile (no customization whatsoever), it won't find any database information (since these are stored in the production profile). In that case, it will try to find an embedded database and start it for you. If you need more customization for some reason, you can have a application-test.properties for those (you'll need to add ActiveProfiles("test") to your test(s).