extended and improved tests; unit tests now mock the DB, integration tests use an empty DB with test values that is reset for each test function

.flaskenv

@@ -4,7 +4,7 @@ FLASK_APP = "the_works"
 FLASK_ENV = "development"
 FLASK_SECRET_KEY = "f8148ee5d95b0a67122b1cab9993f637a6bf29528f584a9f1575af1a55566748"
 FLASK_TESTING = False
-FLASK_MAX_CONTENT_LENGTH = 1024 * 1024
+#FLASK_MAX_CONTENT_LENGTH = 1024 * 1024
 FLASK_DEBUG = True
 
 FLASK_SQLALCHEMY_DATABASE_URI = "sqlite:///../the_works.sqlite"

tests/conftest.py

@@ -1,5 +1,6 @@
 import pytest
 from the_works import create_app
+from the_works.database import db as _db
 
 TEST_DATABASE_URI = "sqlite:///:memory:"
 
@@ -8,6 +9,7 @@ def app():
   test_config = {
     "ENV": "Testing",
     "SQLALCHEMY_DATABASE_URI": TEST_DATABASE_URI,
+    "SECRET_KEY": "This is my very secret key",
     "TESTING": True
   }
   app = create_app(test_config)
@@ -19,6 +21,14 @@ def app():
   # clean up / reset resources here
 
 
+@pytest.fixture(scope="function")
+def db(app):
+  with app.app_context():
+    yield _db
+    _db.drop_all()
+    _db.create_all()
+
+
 @pytest.fixture()
 def client(app):
   return app.test_client()

tests/integration/test_int_genre.py

@@ -0,0 +1,27 @@
+from sqlalchemy import select
+from the_works.database import db
+from the_works.models import Genre
+from sqlalchemy.exc import IntegrityError
+import pytest
+
+def test_genre_create(client, app):
+  """Integrated testing of adding a Genre record."""
+  response = client.post("/genre/create", data={"form_Genre": "Test-Genre"}, follow_redirects=True)
+
+  # assert there was exactly 1 redirect
+  assert len(response.history) == 1
+  # assert the redirect led to the correct page
+  assert response.request.path == "/genre/all"
+  assert response.status_code == 200
+
+  # assert record was successfully added to DB
+  with app.app_context():
+    genre = db.session.scalars(select(Genre).where(Genre.Genre == "Test-Genre")).all()
+    assert len(genre) == 1
+    assert isinstance(genre[0], Genre)
+
+  # assert uniqueness of records
+  with pytest.raises(IntegrityError) as excinfo:
+    response = client.post("/genre/create", data={"form_Genre": "Test-Genre"})
+  assert "UNIQUE constraint failed" in str(excinfo.value)
+

tests/unit/test_unit_genre.py

@@ -0,0 +1,58 @@
+from the_works.models import Genre
+import pytest
+
+
+def test_genre_all(client, db, mocker):
+  """Test view all() from genre.py."""
+
+  # mock database function
+  # Note: The original method returns an sqlalchemy.engine.Result.ScalarResult, not a list, but the template code
+  # uses the return value in a way that works for both ScalarResult and list
+  mocker.patch("the_works.database.db.session.scalars", return_value=[
+    Genre(ID=4, Genre="bla"),
+    Genre(ID=26, Genre="blubb")
+  ])
+
+  # test case: get request
+  response = client.get("/genre")
+  assert response.status_code == 200
+  assert response.data.count(b'<tr id="genre-') == 2
+
+  # test case: post request 
+  response = client.post("/genre")
+  assert response.status_code == 405
+
+
+def test_genre_create(client, db, mocker):
+  """Test view create() from genre.py."""
+
+  # mock database function
+  mocker.patch("the_works.database.db.session.add")
+
+  # test a POST request with good data
+  response = client.post("/genre/create", data={"form_Genre": "Testname"}, follow_redirects=True)
+  # exactly 1 redirect
+  assert len(response.history) == 1
+  # redirect to the right page
+  assert response.request.path == "/genre/all"
+  assert response.status_code == 200
+
+  # test a POST request with no form data
+  with pytest.raises(ValueError) as excinfo:
+    response = client.post("/genre/create", data={})
+  assert "value can't be empty" in str(excinfo.value)
+
+  # test a POST request with bad form data
+  with pytest.raises(ValueError) as excinfo:
+    response = client.post("/genre/create", data={"wrong_key": "Genrename"})
+  assert "value can't be empty" in str(excinfo.value)
+
+  # test a POST request with empty form data
+  with pytest.raises(ValueError) as excinfo:
+    response = client.post("/genre/create", data={"form_genre": ""})
+  assert "value can't be empty" in str(excinfo.value)
+
+  # test a GET request 
+  response = client.get("/genre/create", query_string={"form_Genre": "GET-Genre"})
+  assert response.status_code == 405
+  

tests/unit/test_unit_home.py

@@ -0,0 +1,4 @@
+def test_home_startpage(client):
+  response = client.get("/")
+  assert response.status_code == 200
+  assert response.data.startswith(b"<!DOCTYPE html>\n")