Merge pull request #25 from pganssle/immutable_constants

Use immutable containers for test constants
pganssle · Jun 18, 2020 · 47bd4bd · 47bd4bd
2 parents 4d65efa + fa5c3a7
commit 47bd4bd
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/tests/_common.py b/tests/_common.py
@@ -26,8 +26,8 @@ def _(f):
 ZERO = timedelta(0)
 UTC = pds._compat.UTC
 
-VALID_ZONES = sorted(pytz.all_timezones)
-VALID_ZONE_SET = set(VALID_ZONES)
+VALID_ZONES = tuple(sorted(pytz.all_timezones))
+VALID_ZONE_SET = frozenset(VALID_ZONES)
 
 # There will be known inconsistencies between pytz and the other libraries
 # right around the EPOCHALYPSE, because V1 files use 32-bit integers, and