def test_set_top_levelby_key(self):
doc = {'foo': 'bar'}
rewrite.set_by_key(doc, 'foo', 'baz')
assert doc['foo'] == 'baz'
def test_set_failure_is_noop(self):
doc = {'foo': 'bar'}
orig = doc.copy()
rewrite.set_by_key(doc, 'not_exists', 'baz')
assert doc == orig
