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<?phpnamespace ParagonIE\CipherSweet\Tests\Transformation;
 
 use ParagonIE\CipherSweet\Contract\TransformationInterface;
 use ParagonIE\CipherSweet\Transformation\DigitsOnly;
 
 /**
 * Class LowercaseTest
 * @package ParagonIE\CipherSweet\Tests\Transformation
 */
 class DigitsOnlyTest extends GenericTransfomationCase
 {
 /**
 * @return TransformationInterface
 */
 protected function getTransformation()
 {
 return new DigitsOnly();
 }
 
 /**
 * @return array<int, array<int, string>>
 */
 protected function getTestCases()
 {
 return [
 ['13375p34k 15 4cc3p74813', '1337534154374813'],
 ['apple', ''],
 ['1', '1'],
 ['12', '12'],
 ['123', '123'],
 ['1234', '1234'],
 ['12345', '12345'],
 ['123456', '123456'],
 ['123-456-7890', '1234567890']
 ];
 }
 }
 
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