Issue 4970 - Document the library API of python-abp

tests/test_fs_source.py

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 import pytest
 
-from abp.filters import FSSource, NotFound
+from abp.filters.sources import FSSource, NotFound
 
 
 @pytest.fixture
 def fssource_dir(tmpdir):
     tmpdir.mkdir('root')
     not_in_source = tmpdir.join('not-in-source.txt')
     not_in_source.write('! secret')
     root = tmpdir.join('root')
     root.mkdir('foo')
     foobar = root.join('foo', 'bar.txt')
@@ skipping 11 matching lines @@
 
 
 def test_escape_source(fssource):
     with pytest.raises(ValueError):
         list(fssource.get('../not-in-source.txt'))
 
 
 def test_read_missing_file(fssource):
     with pytest.raises(NotFound):
         list(fssource.get('foo/baz.txt'))