Problem

If any project will require two allure-framework packages (in our case allure-phpunit and allure-codeception) we will have two classes which have identical full class names: Yandex\Allure\Adapter\AllureAdapter.
It will cause an issue for autoloader to load appropriate adaptor for codeception and phpunit.

Suggestion

Make namespace unique.
For example:
Yandex\Allure\Codeception\Adapter\AllureAdapter
Yandex\Allure\PHPUnit\Adapter\AllureAdapter

Or class name unique

Yandex\Allure\Adapter\CodeceptionAllureAdapter
Yandex\Allure\Adapter\PHPUnitAllureAdapter

Related Issue

allure-framework/allure-phpunit#41