Add quality assurance tests.

pyproject.toml

@@ -0,0 +1,3 @@
+[tool.black]
+line-length = 79
+

requirements.txt

@@ -1,6 +1,20 @@
+black==23.3.0
 click==8.1.3
+flake8==6.0.0
 Flask==2.2.3
+Flask-HTTPAuth==4.7.0
 itsdangerous==2.1.2
 Jinja2==3.1.2
 MarkupSafe==2.1.2
+mccabe==0.7.0
+mypy==1.2.0
+mypy-extensions==1.0.0
+packaging==23.0
+pathspec==0.11.1
+platformdirs==3.2.0
+pur==7.1.0
+pycodestyle==2.10.0
+pyflakes==3.0.1
+tomli==2.0.1
+typing_extensions==4.5.0
 Werkzeug==2.2.3

script/qa

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+#!/bin/bash
+# Software Quality Assurance tests (formatters, linters, ...)
+
+if [ "$1" == "--dry-run" ]; then
+    BLACK_FLAGS="--check"
+fi
+
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+
+FILES=(
+    main.py
+)
+
+# Code formatting
+python3 -m black ${BLACK_FLAGS:-} "${FILES[@]}"
+
+# Linters
+python3 -m flake8 "${FILES[@]}"
+python3 -m mypy "${FILES[@]}"
+