def test_fetch_rates():
response_mock = Mock()
response_mock.status_code = -1
response_mock.json.return_value = {
'12/25': 'Christmas',
'7/4': 'Independence Day',
}
cc = CurrencyConverter(['JPY'], ['USD'])
with patch('currency_converter.requests') as mock_requests:
mock_requests.get.side_effect = response_mock
assert cc.fetch_rate('JPY', 'USD') == "No response from the server"
with patch('currency_converter.re.sub') as mock_sub:
mock_sub.return_value = '10.93'
assert cc.fetch_rate('GBP', 'USD') == None
mock_sub.return_value = '1093'
assert cc.fetch_rate('GBP', 'USD') == 1093
with pytest.raises(Exception):
cc.fetch_rate('Hello', 'World')
