Prepare pytest for end-to-end testing

.gitignore

@@ -1,5 +1,5 @@
-data/
-output.db
+/data/
+/output.db
 
 # Created by https://www.toptal.com/developers/gitignore/api/vim,linux,python,pandas
 # Edit at https://www.toptal.com/developers/gitignore?templates=vim,linux,python,pandas

noxfile.py

@@ -3,7 +3,7 @@ import nox
 
 @nox.session(python=["3.7", "3.8", "3.9"])
 def tests(session):
-    args = session.posargs or ["--cov"]
+    args = session.posargs or ["--cov", "-m", "not e2e"]
     session.run("poetry", "install", external=True)
     session.run("pytest", *args)
     pass

tests/conftest.py

@@ -0,0 +1,2 @@
+def pytest_configure(config):
+    config.addinivalue_line("markers", "e2e: mark as end to end test.")