Codeception Tests take 'default' datasource instead of 'test'

[tgaertner]

I use a ddev docker for running the tests. I'm able to run UnitTests via Codeception, but when it comes to database and fixtures its confusing...

My codeception.dist.yml

namespace: App\TestSuite\Codeception
paths:
 tests: tests
 output: tmp/tests
 data: tests/Fixture
 support: src/TestSuite/Codeception
 envs: tests/Envs
settings:
 bootstrap: bootstrap.php
 colors: true
 memory_limit: 1024M
actor_suffix: Tester
extensions:
 enabled:
 - Codeception\Extension\RunFailed
modules:
 config:
 Db:
 dsn: 'mysql:host=%DB_HOST_TEST%;dbname=%DB_NAME_TEST%'
 user: '%DB_USER_TEST%'
 password: '%DB_PASSWORD_TEST%'
 dump: tests/_data/dump.sql
 cleanup: true # reload dump between tests
 populate: true # load dump before all tests
 reconnect: true
 enabled:
 - Db
params:
 - env

The dump.sql is imported into the test database on running my tests. Fixtures are not inserted...

Then in my Test "class HashableBehaviorTest extends \Codeception\Test\Unit" I do something like:
$user = $this->UsersTable->get(1);
This gives me the first record from my default database and not from the test database. I have no Idea what is missing here... Glad for any help!