1318: Setup backend test database

[seluianova]

Short description

To add integration tests for the backend (#1532), we need to setup a database.
In my opinion, using test containers library is the most convenient way to implement that.

Proposed changes

Add IntegrationTest base class, where database setup is performed.
To add new tests that require a database, new test classes must extend the IntegrationTest class.

Side effects

Would be nice to check if everything works on different OS.
I have only tested it on Ubuntu 22.04.4 LTS.

Resolved issues

Fixes: #1318

[f1sh1918]

Looks good to me. Tested on MacOS
Just one question. How can i trigger all tests at once?
Just found out how to trigger every single one.
The test execution should be added to circle ci check_backend even these are only temporary tests.

Nicely done :) 👍

[seluianova]

@f1sh1918
All backend tests are run with ./gradlew test, so the new tests are also included in CI already and passed

[f1sh1918]

Ok i think everything should be fine.

gradle test does not work for because of some jvm issue but that should rely on my local configuration
Have to fix that
But in intelliJ test container and tests work

[seluianova]

@f1sh1918 try gradlew instead of gradle, it means “gradle wrapper”

[seluianova]

@ztefanie could you please also check that you can run the new tests locally?

[f1sh1918]

maybe @steffenkleinle can test it, since steffi will be on vacation

[f1sh1918]

@f1sh1918 try gradlew instead of gradle, it means “gradle wrapper”

doesn't help. its my local jvm config. nevermind

Update: Fixed my jvm installation @seluianova works fine now :)

[steffenkleinle]

Tested, works for me!