ExceptionCollector.php

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<?php
namespace Magento\FunctionalTestingFramework\Exceptions\Collector;

class ExceptionCollector
{
    private $errors = [];

    public function addError($filename, $message)
    {
        $error[$filename] = $message;
        $this->errors = array_merge_recursive($this->errors, $error);
    }

    public function throwException()
    {
        if (empty($this->errors)) {
            return;
        }

        $errorMsg = implode("\n\n", $this->formatErrors($this->errors));
        throw new \Exception("\n" . $errorMsg);
    }

    private function formatErrors($errors)
    {
        $flattenedErrors = [];
        foreach ($errors as $key => $errorMsg) {
            if (is_array($errorMsg)) {
                $flattenedErrors = array_merge($flattenedErrors, $this->formatErrors($errorMsg));
                continue;
            }

            $flattenedErrors[] = $errorMsg;
        }

        return $flattenedErrors;
    }
}