def test_pop_does_not_fail_if_step_has_no_parent(self):
registry = Registry().reset()
step = Mock()
step.parent = None
registry.push(step)
self.assertEquals(None, registry.pop())
def test_support_adding_steps(self):
registry = Registry().reset()
step = Mock()
ret_value = registry.push(step)
self.assertEquals([step], registry.root_steps)
self.assertEquals(None, ret_value)
def test_adding_a_descendant_step_returns_the_parent(self):
registry = Registry().reset()
step1 = Mock()
step2 = Mock()
ret_value1 = registry.push(step1)
ret_value2 = registry.push(step2)
self.assertEquals(None, ret_value1)
self.assertEquals(step1, ret_value2)
self.assertEquals([step1], registry.root_steps)
def test_pushing_after_popping_creates_a_new_root_step(self):
registry = Registry().reset()
step1 = Mock()
step1.parent = None
step2 = Mock()
step2.parent = None
registry.push(step1)
registry.pop()
registry.push(step2)
self.assertEquals([step1, step2], registry.root_steps)
def test_pop_returns_none_if_no_steps(self):
registry = Registry().reset()
self.assertEquals(None, registry.pop())
