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

This solution enables common settings for develop and test. Is based on this solution: Override default Spring-Boot application.properties settings in Junit Test

1. application.properties in src/main/resources/application.properties

    #common settings for DEVELOPMENT and TEST:
    ......
    ......

    ## Spring DATASOURCE (DataSourceAutoConfiguration & DataSourceProperties)
    spring.datasource.url=jdbc:postgresql://localhost:5432/databasename
    spring.datasource.username=postgres
    spring.datasource.password=somepassword

    # The SQL dialect makes Hibernate generate better SQL for the chosen database
    spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect
    spring.jpa.properties.hibernate.jdbc.time_zone=UTC

    # Hibernate ddl auto (create, create-drop, validate, update)
    spring.jpa.hibernate.ddl-auto = none
    spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true

2. test.properties (src/main/resources/application.properties) which overrides and adds properties in application.properties:

    spring.datasource.url=jdbc:h2:mem:testdb;MODE=PostgreSQL
    spring.datasource.driverClassName=org.h2.Driver
    spring.datasource.username=sa
    spring.datasource.password=
    spring.jpa.hibernate.ddl-auto=update
    spring.h2.console.enabled=false

3. settings in pom.xml for H2 and Postgre databases

      
      
        com.h2database
        h2
      

    
      
         org.postgresql
         postgresql
      

4. In test class:

    @RunWith(SpringRunner.class)
    @SpringBootTest
    @TestPropertySource(locations = "classpath:test.properties")
    public class ModelTest { 

    }