How can this be?

testRandom
Failed asserting that two arrays are equal.
Expected: Array (
     'modifier' => 0
     'maximum_spell_level' => 1
     'extra_spells' => Array ()
)
Actual: Array (
     'modifier' => 0
     'maximum_spell_level' => 0
     'extra_spells' => Array ()
)

although in the main test
  $ this-> assertEquals (['modifier' => 0, 'maximum_spell_level' => 0, 'extra_spells' => []], char_attribute (10));

It seems to me alone that these are mutually exclusive conditions