test(graph-api): add integration tests for project CRUD endpoints

8 tests covering list, get, create, delete, and reset endpoints via
Flask test client with in-memory SQLite and mocked storage.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/tests/test_graph_api_project.py

@@ -0,0 +1,143 @@
+"""Tests d'integració per als endpoints de projecte de graph.py."""
+import pytest
+from unittest.mock import MagicMock, patch
+
+
+@pytest.fixture
+def mock_storage():
+    s = MagicMock()
+    s.exists.return_value = False
+    s.delete_prefix.return_value = None
+    return s
+
+
+@pytest.fixture
+def app(in_memory_db, mock_storage):
+    """Flask app amb BD en memòria i storage mock.
+
+    in_memory_db ja ha configurat db_module._engine i _SessionLocal.
+    Passem un DATABASE_URL de sqlite en memòria perquè create_app() cridi
+    init_db() amb el mateix engine; però com que in_memory_db ja ha establert
+    els mòduls globals, parchegem init_db per evitar que sobreescrigui l'engine.
+    """
+    import backend.app.db as db_module
+
+    # Guardem les referències que in_memory_db ja ha configurat
+    saved_engine = db_module._engine
+    saved_session = db_module._SessionLocal
+
+    def _noop_init_db(url):
+        # Restaurem per si create_app() reseteja el mòdul
+        db_module._engine = saved_engine
+        db_module._SessionLocal = saved_session
+
+    with patch('backend.app.db.init_db', side_effect=_noop_init_db):
+        from backend.app import create_app
+        application = create_app()
+
+    application.config['TESTING'] = True
+    application.extensions['storage'] = mock_storage
+
+    # Assegurem que el mòdul db segueix apuntant a l'engine en memòria
+    db_module._engine = saved_engine
+    db_module._SessionLocal = saved_session
+
+    return application
+
+
+@pytest.fixture
+def client(app):
+    with app.test_client() as c:
+        yield c
+
+
+# ──────────────────────────────────────────────
+# Tests
+# ──────────────────────────────────────────────
+
+def test_list_projects_empty(client):
+    res = client.get('/api/graph/project/list')
+    assert res.status_code == 200
+    data = res.get_json()
+    assert data['success'] is True
+    assert data['data'] == []
+    assert data['count'] == 0
+
+
+def test_get_project_not_found(client):
+    res = client.get('/api/graph/project/nonexistent-id')
+    assert res.status_code == 404
+    data = res.get_json()
+    assert data['success'] is False
+
+
+def test_create_and_get_project(client, in_memory_db):
+    from backend.app.models.project import ProjectManager
+    proj = ProjectManager.create_project(name="Test Project")
+    project_id = proj['project_id']
+
+    res = client.get(f'/api/graph/project/{project_id}')
+    assert res.status_code == 200
+    data = res.get_json()
+    assert data['success'] is True
+    assert data['data']['name'] == 'Test Project'
+    assert data['data']['graph_id'] is None
+    assert data['data']['ontology'] is None
+
+
+def test_list_projects_returns_created(client, in_memory_db):
+    from backend.app.models.project import ProjectManager
+    ProjectManager.create_project(name="Alpha")
+    ProjectManager.create_project(name="Beta")
+
+    res = client.get('/api/graph/project/list')
+    assert res.status_code == 200
+    data = res.get_json()
+    assert data['count'] == 2
+    names = [p['name'] for p in data['data']]
+    assert 'Alpha' in names
+    assert 'Beta' in names
+
+
+def test_delete_project(client, in_memory_db, mock_storage):
+    from backend.app.models.project import ProjectManager
+    proj = ProjectManager.create_project(name="ToDelete")
+    project_id = proj['project_id']
+
+    res = client.delete(f'/api/graph/project/{project_id}')
+    assert res.status_code == 200
+    assert res.get_json()['success'] is True
+
+    res2 = client.get(f'/api/graph/project/{project_id}')
+    assert res2.status_code == 404
+
+
+def test_reset_project_to_created(client, in_memory_db):
+    from backend.app.models.project import ProjectManager
+    proj = ProjectManager.create_project(name="ToReset")
+    project_id = proj['project_id']
+    ProjectManager.save_project({"id": project_id, "status": "graph_completed"})
+
+    res = client.post(f'/api/graph/project/{project_id}/reset')
+    assert res.status_code == 200
+    data = res.get_json()
+    assert data['success'] is True
+    assert data['data']['status'] == 'created'  # sense ontologia → torna a 'created'
+
+
+def test_reset_project_to_ontology_generated(client, in_memory_db):
+    from backend.app.models.project import ProjectManager
+    proj = ProjectManager.create_project(name="ToReset2")
+    project_id = proj['project_id']
+    ProjectManager.save_project({"id": project_id, "status": "graph_completed"})
+    ProjectManager.save_ontology(project_id, [{"name": "Person"}], [{"name": "KNOWS"}])
+
+    res = client.post(f'/api/graph/project/{project_id}/reset')
+    assert res.status_code == 200
+    data = res.get_json()
+    assert data['data']['status'] == 'ontology_generated'
+
+
+def test_reset_nonexistent_project(client):
+    res = client.post('/api/graph/project/nonexistent/reset')
+    assert res.status_code == 404