def test_get_previous_link_value(self, mock_super):
"""Test the get previous link method when super returns a value."""
expected = 'http://localhost:8000/api/v1/providers/?offset=20'
mock_super.return_value = expected
paginator = StandardResultsSetPagination()
paginator.request = Mock
paginator.request.META = {}
link = paginator.get_previous_link()
self.assertEqual(link, expected)
def test_get_previous_link_none(self, mock_super):
"""Test the get previous link method when super returns none."""
paginator = StandardResultsSetPagination()
link = paginator.get_previous_link()
self.assertIsNone(link)