/electricity-tariff-calculator-sample-solution

Primary LanguagePython

Electricity Tariff Calculator Sample Solution

This is a sample solution to an interview challenge I used to set candidates. Details of the challenge are available here.

The solution demonstrates acceptance and unit testing along with some code design practices like separation of concerns, avoidance of duplication and clear naming. It uses a "Ports & Adapters" (a.k.a "Hexagonal") architecture to separate the domain model from external concerns like displaying results and loading data. The OO domain model groups cohesive concepts and avoids accidental coupling.

Development environment prerequisites

  • python 3
  • pip
  • virtualenv

Configure development environment

From project root, run:

virtualenv -p python3 .venv
. ./.venv/bin/activate
pip install -r requirements.txt

Running the program

From project root, run:

python tariff_calculator/index.py input.csv

Run tests

From project root, run:

pytest

Run unit tests

From project root, run:

pytest test/unit

Run acceptance tests

From project root, run:

pytest test/acceptance_test.py