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_cli.py

@@ -0,0 +1,37 @@
+from pathlib import Path
+from tempfile import tempdir
+
+import pytest
+from langflow.__main__ import app
+from langflow.services import deps
+
+
+@pytest.fixture(scope="module")
+def default_settings():
+    return [
+        "--backend-only",
+        "--no-open-browser",
+    ]
+
+
+def test_components_path(runner, client, default_settings):
+    # Create a foldr in the tmp directory
+
+    temp_dir = Path(tempdir)
+    # create a "components" folder
+    temp_dir = temp_dir / "components"
+    temp_dir.mkdir(exist_ok=True)
+
+    result = runner.invoke(
+        app,
+        ["run", "--components-path", str(temp_dir), *default_settings],
+    )
+    assert result.exit_code == 0, result.stdout
+    settings_service = deps.get_settings_service()
+    assert str(temp_dir) in settings_service.settings.components_path
+
+
+def test_superuser(runner, client, session):
+    result = runner.invoke(app, ["superuser"], input="admin\nadmin\n")
+    assert result.exit_code == 0, result.stdout
+    assert "Superuser created successfully." in result.stdout