Kuberentes refresh_config has untested method https://codecov.io/gh/apache/airflow/src/master/airflow/kubernetes/refresh_config.py 75%

We might want to improve that.
tests/kubernetes/test_refresh_config.py
#
#
from unittest import TestCase
import pytest
from pendulum.parsing import ParserError
from airflow.kubernetes.refresh_config import _parse_timestamp
class TestRefreshKubeConfigLoader(TestCase):
    def test_parse_timestamp_should_convert_z_timezone_to_unix_timestamp(self):
        ts = _parse_timestamp("2020-01-13T13:42:20Z")
        assert 1578922940 == ts
    def test_parse_timestamp_should_convert_regular_timezone_to_unix_timestamp(self):
        ts = _parse_timestamp("2020-01-13T13:42:20+0600")
        assert 1578922940 == ts
    def test_parse_timestamp_should_throw_exception(self):
        with pytest.raises(ParserError):
            _parse_timestamp("foobar")