Clippings.com invoicing command challenge

Clippings challenges you to create a PHP application that lets you sum invoice documents.

This is a small task to evaluate potential hires.

The task

We have a list of DTO containing data for invoices, credit and debit notes. We also have a console command that should return the sum of all the documents.

Note, that if we have a credit note, it should subtract from the total of the invoice and if we have a debit note, it should add to the sum of the invoice.

Document types:

• 1 = invoice
• 2 = credit note
• 3 = debit note

Some pointers

• The application should comply to the PSR-2 coding standard
• The application MUST be covered by unit tests
• Make the calculation objects usable as a stand-alone component
• The application must handle the case, where the total of all the credit notes is bigger than the sum of the invoice

Example usage

Command:

bin/console documents:calculate