Cover \Snowcap\Emarsys\Client::__construct with tests
Add test for \Snowcap\Emarsys\Client::addFieldsMapping
Fix choices mapping and cover \Snowcap\Emarsys\Client::addChoicesMapping with test
Refactor \Snowcap\Emarsys\Client::getFieldId and cover it with tests
Refactor \Snowcap\Emarsys\Client::getChoiceId and cover it with tests
Cover \Snowcap\Emarsys\Client::getChoiceName with tests
Cover \Snowcap\Emarsys\Client::getContactData with test
Cover \Snowcap\Emarsys\Client::createContact with test