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)