Add test demonstrating unloading the module during dynamic configuration

tests/demo.py

@@ -1,10 +1,11 @@
+import sys
 from pathlib import Path
 from more_itertools import ilen
 
 # TODO NOTE: this wouldn't work because of an early my.config.demo import
 # from my.demo import items
 
-def test_dynamic_config(tmp_path: Path) -> None:
+def test_dynamic_config_1(tmp_path: Path) -> None:
     import my.config
 
     class user_config:
@@ -17,7 +18,46 @@ def test_dynamic_config(tmp_path: Path) -> None:
     assert item1.username == 'user'
 
 
+# exactly the same test, but using a different config, to test out the behavious w.r.t. import order
+def test_dynamic_config_2(tmp_path: Path) -> None:
+    # doesn't work without it!
+    # because the config from test_dybamic_config_1 is cached in my.demo.demo
+    del sys.modules['my.demo']
+
+    import my.config
+
+    class user_config:
+        username  = 'user2'
+        data_path = f'{tmp_path}/*.json'
+    my.config.demo = user_config # type: ignore[misc, assignment]
+
+    from my.demo import items
+    [item1, item2] = items()
+    assert item1.username == 'user2'
+
+
 import pytest # type: ignore
+
+@pytest.mark.skip(reason="won't work at the moment because of inheritance")
+def test_dynamic_config_simplenamespace(tmp_path: Path) -> None:
+    # doesn't work without it!
+    # because the config from test_dybamic_config_1 is cached in my.demo.demo
+    del sys.modules['my.demo']
+
+    import my.config
+    from types import SimpleNamespace
+
+    user_config = SimpleNamespace(
+        username='user3',
+        data_path=f'{tmp_path}/*.json',
+    )
+    my.config.demo = user_config # type: ignore[misc, assignment]
+
+    from my.demo import config
+    assert config().username == 'user3'
+
+
+
 @pytest.fixture(autouse=True)
 def prepare(tmp_path: Path):
     (tmp_path / 'data.json').write_text('''