Fix lint errors

tests/__init__.py

@@ -1,5 +1,7 @@
 #!/usr/bin/env python3
 
+"""PyTest unit tests."""
+
 import pytest
 
 from app.app import app
@@ -7,5 +9,6 @@ from app.app import app
 
 @pytest.fixture
 def client():
+    """Set up Flask client for use in tests."""
     client = app.test_client()
     yield client

tests/test_app.py

@@ -1,10 +1,12 @@
 #!/usr/bin/env python3
 
-import pytest
+"""Tests for app/app.py"""
+
 
 from tests import client
 
 
 def test_index(client) -> None:
+    """Ensure that the index page is loaded correctly."""
     req = client.get('/')
     assert req.status_code == 200 and "ePage" in req.text

tests/test_send_page.py

@@ -1,12 +1,15 @@
 #!/usr/bin/env python3
 
+"""Tests for app/send_page.py"""
+
 from app.send_page import send_page
 
 
 def test_send_page_no_env() -> None:
+    """Ensure the API returns an error if no API key specified."""
     result = send_page(
         name='Unit Test',
         email='none@none.com',
         message='Unit Test'
     )
-    assert result[0] == False and result[1].get('token') == 'invalid'
+    assert not result[0] and result[1].get('token') == 'invalid'