google-fonts/axisregistry/tests/test_axisregistry_api.py

from axisregistry import AxisRegistry


def test_AxisRegistry():
    registry = AxisRegistry()
    assert 'GRAD' in registry.keys()
    for axis_tag in registry.keys():
        assert len(axis_tag) == 4
        for f in range(len(registry[axis_tag].fallback)):
            fallback = registry[axis_tag].fallback[f]

            # fallback names should not be space-separated.
            # (see: https://github.com/googlefonts/axisregistry/issues/7)
            assert ' ' not in fallback.name