79 lines
2.6 KiB
Python
79 lines
2.6 KiB
Python
from types import SimpleNamespace
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from unittest.case import TestCase
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from unittest.mock import Mock, patch
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from dns.exception import Timeout
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from validate_email import dns_check
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from validate_email.dns_check import _get_cleaned_mx_records
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from validate_email.exceptions import DNSTimeoutError, NoValidMXError
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class DnsNameStub(object):
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'Stub for `dns.name.Name`.'
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def __init__(self, value: str):
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self.value = value
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def to_text(self) -> str:
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return self.value
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class DnsRRsetStub(object):
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'Stub for `dns.rrset.RRset`.'
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def __init__(self, hostnames: list):
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self.names = [
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SimpleNamespace(exchange=DnsNameStub(value=x)) for x in hostnames]
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def processing_order(self):
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return self.names
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def _answer(hostnames: list):
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return SimpleNamespace(rrset=DnsRRsetStub(hostnames=hostnames))
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TEST_QUERY = Mock()
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class GetMxRecordsTestCase(TestCase):
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'Testing `_get_mx_records`.'
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@patch.object(target=dns_check, attribute='resolve', new=TEST_QUERY)
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def test_fails_with_invalid_hostnames(self):
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'Fails when an MX hostname is "."'
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TEST_QUERY.return_value = _answer(hostnames=['.'])
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with self.assertRaises(NoValidMXError) as exc:
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_get_cleaned_mx_records(domain='testdomain1', timeout=10)
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self.assertTupleEqual(exc.exception.args, ())
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@patch.object(target=dns_check, attribute='resolve', new=TEST_QUERY)
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def test_fails_with_null_hostnames(self):
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'Fails when an MX hostname is invalid.'
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TEST_QUERY.return_value = _answer(hostnames=['asdqwe'])
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with self.assertRaises(NoValidMXError) as exc:
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_get_cleaned_mx_records(domain='testdomain2', timeout=10)
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self.assertTupleEqual(exc.exception.args, ())
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@patch.object(target=dns_check, attribute='resolve', new=TEST_QUERY)
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def test_filters_out_invalid_hostnames(self):
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'Returns only the valid hostnames.'
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TEST_QUERY.return_value = _answer(hostnames=[
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'asdqwe.',
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'.',
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'valid.host.',
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'valid.host.', # This is an intentional duplicate.
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'valid2.host.',
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])
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result = _get_cleaned_mx_records(domain='testdomain3', timeout=10)
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self.assertListEqual(result, ['valid.host', 'valid2.host'])
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@patch.object(target=dns_check, attribute='resolve', new=TEST_QUERY)
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def test_raises_exception_on_dns_timeout(self):
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'Raises exception on DNS timeout.'
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TEST_QUERY.side_effect = Timeout()
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with self.assertRaises(DNSTimeoutError) as exc:
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_get_cleaned_mx_records(domain='testdomain3', timeout=10)
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self.assertTupleEqual(exc.exception.args, ())
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