core: move stuff from tests/demo.py to my/core/tests/test_config.py

also clean all this up a bit

tests/demo.py

@@ -1,118 +0,0 @@
-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_1(tmp_path: Path) -> None:
-    import my.config
-
-    class user_config:
-        username  = 'user'
-        data_path = f'{tmp_path}/*.json'
-        external  = f'{tmp_path}/external'
-    my.config.demo = user_config # type: ignore[misc, assignment]
-
-    from my.demo import items
-    [item1, item2] = items()
-    assert item1.username == 'user'
-
-
-# exactly the same test, but using a different config, to test out the behaviour 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'
-        external  = f'{tmp_path}/external'
-    my.config.demo = user_config # type: ignore[misc, assignment]
-
-    from my.demo import items
-    [item1, item2] = items()
-    assert item1.username == 'user2'
-
-
-import pytest
-
-@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'
-
-
-# make sure our config handling pattern does it as expected
-def test_attribute_handling(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 pytz
-    nytz = pytz.timezone('America/New_York')
-
-    import my.config
-    class user_config:
-        # check that override is taken into the account
-        timezone = nytz
-
-        irrelevant = 'hello'
-
-        username = 'UUU'
-        data_path = f'{tmp_path}/*.json'
-        external  = f'{tmp_path}/external'
-
-
-    my.config.demo = user_config # type: ignore[misc, assignment]
-
-    from my.demo import config
-
-    assert config.username == 'UUU'
-
-    # mypy doesn't know about it, but the attribute is there
-    assert getattr(config, 'irrelevant') == 'hello'
-
-    # check that overridden default attribute is actually getting overridden
-    assert config.timezone == nytz
-
-
-
-@pytest.fixture(autouse=True)
-def prepare(tmp_path: Path):
-    (tmp_path / 'data.json').write_text('''
-[
-    {"key1": 1},
-    {"key2": 2}
-]
-''')
-    ext = tmp_path / 'external'
-    ext.mkdir()
-    (ext / '__init__.py').write_text('''
-def identity(x):
-    from .submodule import hello
-    hello(x)
-    return x
-
-''')
-    (ext / 'submodule.py').write_text('hello = lambda x: print("hello " + str(x))')
-    yield
-    ex = 'my.config.repos.external'
-    if ex in sys.modules:
-        del sys.modules[ex]