def test_coalesce_calls():
first = MagicMock()
second = MagicMock()
last = MagicMock()
first.return_value = None
second.return_value = 'MOCK'
coalesce = callback_utils.coalesce([first, second, last])
value = coalesce('VALUE')
assert first.called
assert value is 'MOCK'
assert not last.called
class Mapper(object):
coalesce = callback_utils.coalesce([_return_none] * 10, else_='ELSE')
def call(self, x):
return self.coalesce(x)
def test_coalesce_10():
coalesce = callback_utils.coalesce([_return_none] * 10, else_='ELSE')
assert coalesce(None) is 'ELSE'
def test_coalesce_else():
coalesce = callback_utils.coalesce([], else_='ELSE')
assert coalesce(None) is 'ELSE'
def test_coalesce_0():
coalesce = callback_utils.coalesce([])
assert coalesce(None) is None
def test_coalesce_1():
coalesce = callback_utils.coalesce([_return_arg])
assert coalesce('RETURN') == 'RETURN'
def test_coalesce_2():
coalesce = callback_utils.coalesce([
_return_none, _return_none
], else_='ELSE')
assert coalesce(None) == 'ELSE'
