def test_requirements_possible(self):
tasks = order_tasks(['dependsonb'], InstallTask)
assert len(tasks) == 2
assert tasks[0] == InstallTask('providesb')
assert tasks[1] == InstallTask('dependsonb')
def test_requirements_impossible(self):
with pytest.raises(PakitError):
order_tasks(['cyclea'], InstallTask)
def test_no_requires(self):
tasks = order_tasks(['providesb'], InstallTask)
assert len(tasks) == 1
assert tasks[0] == InstallTask('providesb')