So ignore my above example, this is how it should be.

```python
 class TestCli(unittest.TestCase):
 
     @classmethod
      def setUpClass(cls):
          cls.presentations = []
          cls.presentations.append(Presentation("test title 1", "test speaker 1", "test room", "test event remove",))
          cls.presentations.append(Presentation("test title 2", "test speaker 2", "test room", "test event remove",))

    ...

    def test_remove_talk(self):
        for presentation in self.presentations:
            self.db.insert_presentation(presentation)
        ...
```