Add Docker-executed pytest suite with >90% coverage

apps/authors/tests/test_models.py

@@ -0,0 +1,16 @@
+import pytest
+
+from apps.authors.models import Author
+
+
+@pytest.mark.django_db
+def test_author_create_and_social_links():
+    author = Author.objects.create(name="Mark", slug="mark", twitter_url="https://x.com/mark")
+    assert str(author) == "Mark"
+    assert author.get_social_links() == {"twitter": "https://x.com/mark"}
+
+
+@pytest.mark.django_db
+def test_author_user_nullable():
+    author = Author.objects.create(name="No User", slug="no-user")
+    assert author.user is None