def test_lookup_adapter():
adapter = LookupAdapter({'Zero': 0, 'One': 1})
assert adapter._decode(0) == 'Zero'
assert adapter._decode(1) == 'One'
with pytest.raises(ValueError):
adapter._decode(2)
with pytest.raises(KeyError):
adapter._encode('Two')
def test_lookup_adapter_snap():
adapter = LookupAdapter({0: 0, 1: 1})
assert adapter._encode(0) == 0
assert adapter._encode(1) == 1
assert adapter._encode(0.1) == 0
assert adapter._encode(0.9) == 1
adapter = LookupAdapter({0: 0, 1: 0}, snap=False)
with pytest.raises(KeyError):
adapter._encode(0.1)