refactor: move tests folder structure and update pytest commands (#2785)

* refactor: move tests folder to src/backend

* chore(Makefile): update pytest commands to run tests from the correct directory paths for unit and integration tests

* refactor: update file path in test_custom_component.py

The file path in the test_custom_component.py file has been updated to use the correct relative path to the component_multiple_outputs.py file. This change ensures that the test code can access the correct file and improves the reliability of the test.

src/backend/tests/unit/test_initial_setup.py

@@ -0,0 +1,88 @@
+from datetime import datetime
+from pathlib import Path
+
+import pytest
+from sqlmodel import select
+
+from langflow.initial_setup.setup import STARTER_FOLDER_NAME, get_project_data, load_starter_projects
+from langflow.services.database.models.folder.model import Folder
+from langflow.services.deps import session_scope
+
+
+def test_load_starter_projects():
+    projects = load_starter_projects()
+    assert isinstance(projects, list)
+    assert all(isinstance(project[1], dict) for project in projects)
+    assert all(isinstance(project[0], Path) for project in projects)
+
+
+def test_get_project_data():
+    projects = load_starter_projects()
+    for _, project in projects:
+        (
+            project_name,
+            project_description,
+            project_is_component,
+            updated_at_datetime,
+            project_data,
+            project_icon,
+            project_icon_bg_color,
+        ) = get_project_data(project)
+        assert isinstance(project_name, str)
+        assert isinstance(project_description, str)
+        assert isinstance(project_is_component, bool)
+        assert isinstance(updated_at_datetime, datetime)
+        assert isinstance(project_data, dict)
+        assert isinstance(project_icon, str) or project_icon is None
+        assert isinstance(project_icon_bg_color, str) or project_icon_bg_color is None
+
+
+@pytest.mark.asyncio
+async def test_create_or_update_starter_projects():
+    with session_scope() as session:
+        # Get the number of projects returned by load_starter_projects
+        num_projects = len(load_starter_projects())
+
+        # Get the number of projects in the database
+        folder = session.exec(select(Folder).where(Folder.name == STARTER_FOLDER_NAME)).first()
+        assert folder is not None
+        num_db_projects = len(folder.flows)
+
+        # Check that the number of projects in the database is the same as the number of projects returned by load_starter_projects
+        assert num_db_projects == num_projects
+
+
+# Some starter projects require integration
+# @pytest.mark.asyncio
+# async def test_starter_projects_can_run_successfully(client):
+#     with session_scope() as session:
+#         # Run the function to create or update projects
+#         create_or_update_starter_projects()
+
+#         # Get the number of projects returned by load_starter_projects
+#         num_projects = len(load_starter_projects())
+
+#         # Get the number of projects in the database
+#         num_db_projects = session.exec(select(func.count(Flow.id)).where(Flow.folder == STARTER_FOLDER_NAME)).one()
+
+#         # Check that the number of projects in the database is the same as the number of projects returned by load_starter_projects
+#         assert num_db_projects == num_projects
+
+#         # Get all the starter projects
+#         projects = session.exec(select(Flow).where(Flow.folder == STARTER_FOLDER_NAME)).all()
+#         graphs: list[tuple[str, Graph]] = []
+#         for project in projects:
+#             # Add tweaks to make file_path work
+#             tweaks = {"path": __file__}
+#             graph_data = process_tweaks(project.data, tweaks)
+#             graph_object = Graph.from_payload(graph_data, flow_id=project.id)
+#             graphs.append((project.name, graph_object))
+#         assert len(graphs) == len(projects)
+#     for name, graph in graphs:
+#         outputs = await graph.arun(
+#             inputs={},
+#             outputs=[],
+#             session_id="test",
+#         )
+#         assert all(isinstance(output, RunOutputs) for output in outputs), f"Project {name} error: {outputs}"
+#         delete_messages(session_id="test")