def test_get_post_list_valid(self):
     posts = Post.get_posts(1, 5)
     self.assertEqual(len(posts), 5)
 def test_get_post_list_with_invalid_param(self):
     posts = Post.get_posts(0, -2)
     self.assertEqual(len(posts), 10)
 def test_get_post_list_with_out_of_range_id(self):
     posts = Post.get_posts(4, 7)
     self.assertEqual(len(posts), 0)
 def test_get_post_list_without_param(self):
     posts = Post.get_posts()
     self.assertEqual(len(posts), 10)