How to configure Spring Boot Application to run on a specific database when launching - spring

Question

I have a Spring MVC Application developed with Spring Boot. This is application is just for learning purposes, by the way.
By default, the app launches and uses a MySQL database. For unit and integration testing, I use an in-memory H2 database and it works perfectly.
So for that, I have two application.properties. One is under /src/main/resources/application.properties.
spring.datasource.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost/myDatabase
spring.datasource.username = root
spring.datasource.password = mysql
spring.thymeleaf.mode=LEGACYHTML5
spring.thymeleaf.cache=false
The other application.properties in under /src/test/resources/application.properties
spring.datasource.driver-class-name=org.h2.Driver
spring.datasource.url=jdbc:h2:mem:db;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE"
spring.datasource.username=sa
spring.datasource.password=sa
Now, I have to use Selenium for automated website testing and I don't want my MySQL database to be populated with test data.
I haven't done this previously in Spring, but I would like my application to work like this:
Launch from terminal my application with certain commands specifying what database it should use. It should launch on localhost:8080
And then, run all Selenium test in localhost:8080. All the data generated with Selenium tests is only kept in memory as long as the application is running
How to do this in a Spring Boot Application using an application.properties or other configuration?

Answer 1

Create a separate properties file named application-test.properties and place it under /src/test/resources. The test database properties (or any other test specific properties) should go here.
On top of your test class, use this annotation #ActiveProfiles("test").
#ActiveProfiles("test")
public class MyTest {
...
}

Answer 2

Spring should do this for you automatically. To run application.properties from src/test/resources when you are running tests because spring runs with "test" profile. If not, add #ActiveProfiles("test") annotation on your test class (and by that I mean the class where you have your tests, not the class under test). If even that doesn't work, you can rename your src/test/resources/application.properties to src/test/resources/application-test.properties and select your profile in your run configuration (there is a field called 'profile'). Reference and more info.