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Service Design · interview question

A bug appears around dependency injection. What is the strongest first debugging move?

Multiple choiceMediumchapter-13-curatedpremiumservice-designdependency-injection
python
from fastapi import Depends

def get_repo() -> OrderRepository:
    return OrderRepository()

@app.get("/orders")
def list_orders(repo: OrderRepository = Depends(get_repo)) -> list[dict]:
    return repo.list_recent()
Choose one answer
Answer and explanation

Correct answer

C. Trace one concrete example, inspect the state transitions, and compare them to the intended rule before rewriting anything.

Why

That approach is reliable because it creates evidence. Global hidden dependencies make route behavior harder to predict and harder to override in tests.

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