Spark Migrate on Testing environment

Hi,

I just want to start learning the CI4.
Within .env file, there was 2 template group of Database, default and tests.

CMIIW,
default group will be used if i set CI_ENVIRONMENT to production.
if i want to use tests group, than i have to set CI_ENVIRONMENT to development or testing ?

my question actually about spark migration.
If i set the environment to production / development, and run php spak migration, it was no error, and the default database filed with migration data.

But if i change the environment to testing, i got this error:

Code:

CodeIgniter CLI Tool - Version 4.0.2 - Server-Time: 2020-02-25 22:24:35pm

ERROR: 404
Controller or its method is not found: App\Controllers\Cimigrate::index

Please advise, how do i use the tests group database during migration?
Thank you.

no, if you have specified the theta data for the database, then you need to specify testing in ENVIRONMENT and then default will not be connected

here in app / Config / Database.php there is a check

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if specified in .env default and tests testing will work if it stands in CI_ENVIRONMENT = testing