The tests located in test/upgrade are intended to test fleet upgrades with online migrations as proposed in #6376.
To run the tests, you need to specify the from and to versions. For example
$ FLEET_VERSION_A=v4.16.0 FLEET_VERSION_B=v4.18.0 go test ./test/upgrade
Ensure that Docker is installed with Compose V2. To check if you have the correct version, run the following command
$ docker compose version
Docker Compose version v2.6.0