Test 1: Checking if results.json exists and is valid...
SUCCESS: results.json exists!
SUCCESS: results.json is valid JSON!
Traceback (most recent call last):
  File "<string>", line 5, in <module>
    assert isinstance(data['classifications'], list), 'classifications must be a list'
                      ~~~~^^^^^^^^^^^^^^^^^^^
TypeError: string indices must be integers, not 'str'
ERROR: results.json has invalid structure!