Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the null and undefined errors pattern
Cannot read properties of undefined, NoneType has no attribute, NaN appearing from nowhere.
What went wrong: index() raises an error when the item is missing.
The fix: if name not in queue: return 0, then return queue.index(name) + 1
Remember: decide what "not found" should return before you look something up.
The pattern behind it: null and undefined errors.
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