Initial my.time.tz provider, infer from location with daily resolution

tests/tz.py

@@ -0,0 +1,62 @@
+from datetime import datetime, timedelta
+from pathlib import Path
+import sys
+
+import pytest # type: ignore
+
+import my.time.tz.main as TZ
+import my.time.tz.via_location as LTZ
+
+
+def test_iter_tzs() -> None:
+    ll = list(LTZ._iter_tzs())
+    assert len(ll) > 3
+
+
+def test_future() -> None:
+    fut = datetime.now() + timedelta(days=100)
+    # shouldn't crash at least
+    assert TZ.localize(fut) is not None
+
+
+def test_tz() -> None:
+    # not present in the test data
+    tz = LTZ._get_tz(D('20200101 10:00:00'))
+    assert tz is None
+
+    tz = LTZ._get_tz(D('20170801 11:00:00'))
+    assert tz is not None
+    assert tz.zone == 'Europe/Vienna'
+
+    tz = LTZ._get_tz(D('20170730 10:00:00'))
+    assert tz is not None
+    assert tz.zone == 'Europe/Rome'
+
+
+def D(dstr: str) -> datetime:
+    return datetime.strptime(dstr, '%Y%m%d %H:%M:%S')
+
+
+# TODO copy pasted from location.py, need to extract some common provider
+@pytest.fixture(autouse=True)
+def prepare(tmp_path: Path):
+    LTZ._FASTER = True
+
+    from more_itertools import one
+    testdata = Path(__file__).absolute().parent.parent / 'testdata'
+    assert testdata.exists(), testdata
+
+    track = one(testdata.rglob('italy-slovenia-2017-07-29.json'))
+
+    # todo ugh. unnecessary zipping, but at the moment takeout provider doesn't support plain dirs
+    import zipfile
+    with zipfile.ZipFile(tmp_path / 'takeout.zip', 'w') as zf:
+        zf.writestr('Takeout/Location History/Location History.json', track.read_bytes())
+
+    # FIXME ugh. early import/inheritance of user_confg in my.google.takeout.paths messes things up..
+    from my.cfg import config
+    class user_config:
+        takeout_path = tmp_path
+    config.google = user_config # type: ignore
+
+    yield