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Merge pull request #336 from tohojo/optional-headers
HeaderMatchingFilter: Gracefully handle missing headers
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Original file line number | Diff line number | Diff line change |
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"""Test suite for DKIMValidityFilter. | ||
""" | ||
import unittest | ||
from email.utils import make_msgid | ||
from unittest import mock | ||
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from afew.Database import Database | ||
from afew.filters.HeaderMatchingFilter import HeaderMatchingFilter | ||
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from notmuch.errors import NullPointerError | ||
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class _AddTags: # pylint: disable=too-few-public-methods | ||
"""Mock for `add_tags` method of base filter. We need to easily collect | ||
tags added by filter for test assertion. | ||
""" | ||
def __init__(self, tags): | ||
self._tags = tags | ||
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def __call__(self, message, *tags): | ||
self._tags.update(tags) | ||
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def _make_header_matching_filter(): | ||
"""Make `HeaderMatchingFilter` with mocked `HeaderMatchingFilter.add_tags` | ||
method, so in tests we can easily check what tags were added by filter | ||
without fiddling with db. | ||
""" | ||
tags = set() | ||
add_tags = _AddTags(tags) | ||
header_filter = HeaderMatchingFilter(Database(), header="X-test", pattern="") | ||
header_filter.add_tags = add_tags | ||
return header_filter, tags | ||
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def _make_message(should_fail): | ||
"""Make mock email Message. | ||
Mocked methods: | ||
- `get_header()` returns non-empty string. When testing with mocked | ||
function for verifying DKIM signature, DKIM signature doesn't matter as | ||
long as it's non-empty string. | ||
- `get_filenames()` returns list of non-empty string. When testing with | ||
mocked file open, it must just be non-empty string. | ||
- `get_message_id()` returns some generated message ID. | ||
""" | ||
message = mock.Mock() | ||
if should_fail: | ||
message.get_header.side_effect = NullPointerError | ||
else: | ||
message.get_header.return_value = 'header' | ||
message.get_filenames.return_value = ['a'] | ||
message.get_tags.return_value = ['a'] | ||
message.get_message_id.return_value = make_msgid() | ||
return message | ||
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class TestHeaderMatchingFilter(unittest.TestCase): | ||
"""Test suite for `HeaderMatchingFilter`. | ||
""" | ||
@mock.patch('afew.filters.HeaderMatchingFilter.open', | ||
mock.mock_open(read_data=b'')) | ||
def test_header_exists(self): | ||
"""Test message with header that exists. | ||
""" | ||
header_filter, tags = _make_header_matching_filter() | ||
message = _make_message(False) | ||
header_filter.handle_message(message) | ||
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self.assertSetEqual(tags, set()) | ||
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@mock.patch('afew.filters.HeaderMatchingFilter.open', | ||
mock.mock_open(read_data=b'')) | ||
def test_header_doesnt_exist(self): | ||
"""Test message with header that exists. | ||
""" | ||
header_filter, tags = _make_header_matching_filter() | ||
message = _make_message(True) | ||
header_filter.handle_message(message) | ||
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self.assertSetEqual(tags, set()) |