Add timezone type checks to Location init test

Author: markcampanelli

pvlib/location.py

@@ -72,6 +72,7 @@ def __init__(self, latitude, longitude, tz='UTC', altitude=None,
             self.tz = 'UTC'
             self.pytz = pytz.UTC
         elif isinstance(tz, datetime.tzinfo):
+            # This includes pytz timezones.
             self.tz = tz.zone
             self.pytz = pytz.timezone(tz.zone)
         elif isinstance(tz, (int, float)):

pvlib/tests/test_location.py

@@ -28,11 +28,16 @@ def test_location_all():
 
 
 @pytest.mark.parametrize('tz', [
-    pytz.timezone('US/Arizona'), 'America/Phoenix',  -7, -7.0,
-    datetime.timezone.utc
+    'America/Phoenix',
+    datetime.timezone.utc,
+    pytz.timezone('US/Arizona'),
+    -7,
+    -7.0,
 ])
 def test_location_tz(tz):
-    Location(32.2, -111, tz)
+    loc = Location(32.2, -111, tz)
+    assert type(loc.tz) is str
+    assert isinstance(loc.pytz, pytz.tzinfo.BaseTzInfo)
 
 
 def test_location_invalid_tz():