my.jawbone: minor cleanup & refactoring, proper error propagation

tests/jawbone.py

@@ -0,0 +1,23 @@
+# TODO depends on my private data... move somewhere, and exclude from CI somehow?
+
+from datetime import date, time
+
+from my.jawbone import sleeps_by_date
+
+# todo private test.. move away
+def test_tz():
+    sleeps = sleeps_by_date()
+    for s in sleeps.values():
+        assert s.sleep_start.tzinfo is not None
+        assert s.sleep_end.tzinfo is not None
+
+    for dd, exp in [
+            (date(year=2015, month=8 , day=28), time(hour=7, minute=20)),
+            (date(year=2015, month=9 , day=15), time(hour=6, minute=10)),
+    ]:
+        sleep = sleeps[dd]
+        end = sleep.sleep_end
+
+        assert end.time() == exp
+        # TODO fuck. on 0909 I woke up at around 6 according to google timeline
+        # but according to jawbone, it was on 0910?? eh. I guess it's just shitty tracking.