def test_task_rejected_fork_should_return_resolved_value():
def rejected_spy(value):
assert value == 0
def resolved_spy(_):
assert False
task_spy = TaskSpy()
task = Task(task_spy.fork_rejected)
task.fork(rejected_spy, resolved_spy)
def test_task_resolved_fork_should_applied_bind_on_his_result():
def rejected_spy(_):
assert False
def resolved_spy(value):
assert value == 42 + 1
task_spy = TaskSpy()
task = Task(task_spy.fork_resolved).bind(task_spy.binder)
task.fork(rejected_spy, resolved_spy)
def test_task_rejected_fork_should_be_called_only_during_calling_fork(
task_spy):
task = Task(task_spy.fork_rejected)
assert task_spy.fork_resolved.call_count == 0
task.fork(task_spy.rejected, task_spy.resolved)
assert task_spy.fork_resolved.call_count == 0
assert task_spy.fork_rejected.call_count == 1
assert task_spy.fork_resolved.call_count == 0
assert task_spy.fork_rejected.call_count == 1
def test_task_rejected_fork_should_not_applied_map_on_his_result():
def rejected_spy(value):
assert value == 0
def resolved_spy(_):
assert False
task_spy = TaskSpy()
task = Task(task_spy.fork_rejected).map(task_spy.mapper)
task.fork(rejected_spy, resolved_spy)
def test_task_mapper_should_be_called_during_calling_fork(task_spy):
task = Task(task_spy.fork_resolved).map(task_spy.mapper)
assert task_spy.mapper.call_count == 0
task.fork(task_spy.rejected, task_spy.resolved)
assert task_spy.mapper.call_count == 1
def binder(self, arg):
return Task(lambda reject, resolve: resolve(arg + 1))
def test_task_monad_laws(integer):
MonadLawTester(monad=Task.of,
value=integer,
mapper1=lambda value: Task.of(value + 1),
mapper2=lambda value: Task.of(value + 2),
get_fn=lambda task: task.fork(identity, identity)).test()
def test_task_functor_laws(integer):
FunctorLawTester(functor=Task.of(integer),
mapper1=increase,
mapper2=lambda value: value + 2,
get_fn=lambda task: task.fork(identity, identity)).test()
def test_task_of_should_applied_only_reject_callback(task_spy):
assert Task.reject(42).fork(task_spy.rejected, task_spy.resolved) == 42
assert task_spy.resolved.call_count == 0
assert task_spy.rejected.call_count == 1