human
Solve the following python programming problem given the following code:
def test_signals_bulk_insert(self) : 
    def bulk_set_active_post() : 
        posts = [self.Post (title = 'Post 1'), self.Post (title = 'Post 2'), self.Post (title = 'Post 3')] 
        self.Post.objects.insert (posts) 
results = self.get_signal_output (<MASK>) 
    self.assertEqual (results, ["pre_bulk_insert signal, [(<Post: Post 1>, {'active': False}), (<Post: Post 2>, {'active': False}), (<Post: Post 3>, {'active': False})]", { 
        
}, "post_bulk_insert signal, [(<Post: Post 1>, {'active': True}), (<Post: Post 2>, {'active': True}), (<Post: Post 3>, {'active': True})]", 'Is loaded', { 
        
}]) 
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
def bulk_set_active_post(