Codeception. Actor classes loaded twice

Question

I try to configure unit-tests suite in Codeception. When I run suite Codeception fail with error Fatal error: Cannot re-declare class rest\tests\UnitTester. With debugger I located places where it loads class first and second time.

First time Codeception load Actor in Codeception\Test\Loader\Gherkin during adding steps to loader.

Second time it initialize Actor instance for class with tests. In second place this class must be already included, but again loader is triggered. Here error appear.

Class is loaded with Codeception loader. At first I think that it was caused by namespace, but UnitTester is only one class in namespace. My .yml files a listed below. I would be very grateful for help.

codeception.yml:

actor: Tester
paths:
    tests: tests
    log: tests/_output
    data: tests/_data
    support: tests/_support
    envs: tests/_envs
settings:
    bootstrap: _bootstrap.php
    colors: true
    memory_limit: 1024M
modules:
    config:
        Yii2:
            configFile: 'config/test-local.php'

unit.suite.yml:

class_name: UnitTester
    modules:
        enabled:
            - Yii2
            - Asserts

Answer 1

I found a reason of this problem. My codeception.yml for this tests missing namespace param when classes in test folder was under namespace. This caused my problem.