Updated timestamp tests for new type format

Author: mrdalgaard

tests/adafruit_gps_test.py

@@ -140,14 +140,14 @@ def test_GPS_update_timestamp_UTC_date_None():
     assert gps.datetime is None
     assert gps.timestamp_utc is None
     exp_struct = time.struct_time((0, 0, 0, 22, 14, 11, 0, 0, -1))
-    gps._update_timestamp_utc(time_utc=221411)
+    gps._update_timestamp_utc(time_utc='221411')
     assert gps.timestamp_utc == exp_struct
 
 
 def test_GPS_update_timestamp_UTC_date_not_None():
     gps = GPS(uart=UartMock())
     exp_struct = time.struct_time((2021, 10, 2, 22, 14, 11, 0, 0, -1))
-    gps._update_timestamp_utc(time_utc=221411, date=21021)
+    gps._update_timestamp_utc(time_utc='221411', date='21021')
     assert gps.timestamp_utc == exp_struct
 
 
@@ -157,7 +157,7 @@ def test_GPS_update_timestamp_timestamp_utc_was_not_none_new_date_none():
     gps.timestamp_utc = time.struct_time((2021, 10, 2, 22, 10, 11, 0, 0, -1))
     exp_struct = time.struct_time((2021, 10, 2, 22, 14, 11, 0, 0, -1))
     # update the timestamp
-    gps._update_timestamp_utc(time_utc=221411)
+    gps._update_timestamp_utc(time_utc='221411')
     assert gps.timestamp_utc == exp_struct