Add a cli interface to choose a configuration (#163)

- [x] add a cli to the webserver to take env variables into account 
- [x] add a cli to the data processing that takes enviromental variable
as a valid source into account
- [x] rework the cli for the reset sql command
- [x] rework the cli for the copying of sql data from one db to another

tests/ui/app_test.py

@@ -1,7 +1,11 @@
 """Test for the main app dashboard."""
+import sys
 from collections.abc import Generator
+from unittest.mock import MagicMock
 
 import pytest
+from _pytest.monkeypatch import MonkeyPatch
+from pytest_mock import MockerFixture
 from sqlalchemy.orm import Session
 
 from aki_prj23_transparenzregister.ui import app
@@ -31,3 +35,27 @@ def test_go_to_company_page() -> None:
     """Checks if the go_to_company_page callback yields a result."""
     output = app.go_to_company_page(1)
     assert output == "/Unternehmensdetails/1"
+
+
+def test_main_of_app(monkeypatch: MonkeyPatch) -> None:
+    monkeypatch.setattr(sys, "argv", [sys.argv[0]])
+    with pytest.raises(SystemExit):
+        app.main()
+
+
+def test_main_of_app_help(monkeypatch: MonkeyPatch) -> None:
+    monkeypatch.setattr(sys, "argv", [sys.argv[0], "-h"])
+    with pytest.raises(SystemExit):
+        app.main()
+
+
+@pytest.mark.parametrize("upper", [True, False])
+def test_main_of_app_env(
+    monkeypatch: MonkeyPatch, upper: bool, mocker: MockerFixture
+) -> None:
+    MagicMock()
+    monkeypatch.setattr(sys, "argv", [sys.argv[0], "ENV" if upper else "env"])
+    mocked = mocker.patch("aki_prj23_transparenzregister.ui.app.Dash.run")
+    mocked.return_value = None
+    app.main()
+    mocked.assert_called_once()