Sets up automated unit tests

.bandit

@@ -1,2 +1,2 @@
 [bandit]
-exclude: /test
+exclude: /tests

.github/workflows/test.yml

@@ -0,0 +1,25 @@
+name: Lint
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.9]
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install .[dev]
+
+      - name: Unit tests
+        run: python -m pytest tests/unit/

pyproject.toml

@@ -50,5 +50,6 @@ dev = [
     "mypy==0.812",
     "mypy-extensions==0.4.3",
     "pyflakes==2.3.1",
-    "types-setuptools"
+    "types-setuptools",
+    "pytest==7.1.2"
 ]

tests/unit/test_validation.py

@@ -1,6 +1,4 @@
 import unittest
-from unittest.mock import MagicMock, patch
-from pydrs import EthDRS
 from pydrs.validation import (
     SerialErrCheckSum,
     SerialErrPckgLen,