def test_clear(self):
md = Metadata()
md.extend([Meta(id='meta1'), Meta(id='meta2'), Meta(id='meta3')])
self.assertEqual(len(md), 3)
md.clear()
self.assertEqual(len(md), 0)
self.assertIs(md.get(0), None)
self.assertIs(md.get('meta1'), None)
def test_clear(self):
md = Metadata()
md.extend([Meta(id='meta1'), Meta(id='meta2'), Meta(id='meta3')])
assert len(md) == 3
md.clear()
assert len(md) == 0
assert md.get(0) is None
assert md.get('meta1') is None
