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INTECH Invoice

.NET Coverage Status

Overview

INTECH Invoice is a simple PDF invoice generation application. This is a console program written in C# using NET 7 framework with minimal dependencies. The app is fully dockerized to be used in both development and production environments. It includes unit, integration (mostly database-related) and end-to-end tests written using NUnit testing framework.

Description

  • All monetary unit input and output values are assumed to be in euros.
  • Invoice numbers have the format of yyyyMMddHHmmss where each letter corresponds to the current year, month, day, hours, minutes and seconds respectively.

Design goals

  • Immutability
  • No static methods
  • No DTOs
  • No ORM
  • No nulls
  • No getters and setters
  • No public constants
  • No controllers (and MVC)
  • Unit, integration and end-to-end tests

Configuration

  • Standard VAT rate is 20% by default. It can be changed using STANDARD_VAT_RATE environment variable.
  • Time zone affects timestamps that constitute invoice numbers. It is configured as a case-insensitive string via TIME_ZONE environment variable. For example, Europe/Munich, Europe/Moscow are valid values. Local (system) time zone is used by default. More information.
  • Date and money format is specified in RFC 4646 format via the CULTURE environment variable. Example: en-US, de-DE. System locale is used by default. More information