def test_extract_regularizer_mutliple_raises():
callbacks = [SplineRegularizer(), SplineRegularizer()]
with pytest.raises(NotImplementedError) as excinfo:
extract_regularizer(callbacks)
err_msg = 'Multiple regularizer callbacks where provided.'
assert err_msg == str(excinfo.value)
def test_extract_regularizer(callback):
callbacks = [Logger(), callback]
assert extract_regularizer(callbacks) == callback
def test_extract_regularizer_no_regularizer():
callbacks = [Logger()]
assert extract_regularizer(callbacks) is None