src/CovCatcher.php
protected function _start()
    {
        if (!$this->_isStart && $this->_coverage) {
            $this->_isStart = true;
            $this->_coverage->start($this->_hash, true);
        }
    }
protected function _start()
    {
        if (!$this->_isStart && $this->_coverage) {
            $this->_isStart = true;
            $this->_coverage->start($this->_hash, true);
        }
    }
Start coverage proccess