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Fix default index for TaggedJSONSerializer.register()

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Change the default value of ``index`` to ``None`` in ``register()`` so
that it is possible to insert a new tag as the penultimate item in the
order list.
This commit is contained in:
Nick Pope 2018-04-19 13:55:37 +01:00
parent 16549370fd
commit fc6a1d9354
2 changed files with 20 additions and 4 deletions
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16
tests/test_json_tag.py
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@ -72,3 +72,19 @@ def test_tag_interface():
pytest.raises(NotImplementedError, t.check, None)
pytest.raises(NotImplementedError, t.to_json, None)
pytest.raises(NotImplementedError, t.to_python, None)
def test_tag_order():
class Tag1(JSONTag):
key = ' 1'
class Tag2(JSONTag):
key = ' 2'
s = TaggedJSONSerializer()
s.register(Tag1, index=-1)
assert isinstance(s.order[-2], Tag1)
s.register(Tag2, index=None)
assert isinstance(s.order[-1], Tag2)