Issue 4970 - Document the library API of python-abp

tests/test_web_source.py

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 from __future__ import unicode_literals
 
 import pytest
 import mock
 
 try:
     from StringIO import StringIO
     from urllib2 import HTTPError
 except ImportError:  # The modules were renamed/moved in Python 3.
     from io import BytesIO as StringIO
     from urllib.error import HTTPError
 
-from abp.filters import WebSource, NotFound
+from abp.filters.sources import WebSource, NotFound
 
 
 @pytest.fixture
 def web_mock(request):
     """Replace urlopen with our test implementation."""
     patcher = mock.patch('abp.filters.sources.urlopen')
     ret = patcher.start()
     request.addfinalizer(patcher.stop)
     return ret
 
@@ skipping 23 matching lines @@
     web_mock.return_value = response_mock('utf-8', b'\xc3\xbc')
     assert list(http_source.get('//foo/bar.txt')) == ['\xfc']
     web_mock.return_value = response_mock(None, b'\xc3\xbc')
     assert list(http_source.get('//foo/bar.txt')) == ['\xfc']
 
 
 def test_404(web_mock, http_source):
     web_mock.side_effect = HTTPError('', 404, 'Not found', [], StringIO(b''))
     with pytest.raises(NotFound):
         list(http_source.get('//foo/bar.txt'))