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Why might using autouse fixtures with a wide scope (like session) cause problems in large test suites?

hard🧠 Conceptual Q10 of 15
PyTest - Fixtures
Why might using autouse fixtures with a wide scope (like session) cause problems in large test suites?
AThey prevent tests from running in parallel.
BThey slow down tests because they run multiple times per test function.
CThey can cause unexpected side effects by running setup code globally for all tests.
DThey require manual invocation in each test.
Step-by-Step Solution
Solution:

  1. Step 1: Understand autouse with wide scope

    Autouse fixtures with session scope run once globally, affecting all tests.

  2. Step 2: Identify potential problems

    This global setup can cause side effects or resource conflicts if not carefully managed.

  3. Final Answer:

    They can cause unexpected side effects by running setup code globally for all tests. -> Option C

  4. Quick Check:

    Wide scope autouse fixtures risk global side effects [OK]
Quick Trick: Wide scope autouse fixtures can cause global side effects [OK]
Common Mistakes:
MISTAKES
  • Thinking autouse fixtures run multiple times per test with session scope
  • Assuming autouse disables parallel testing
  • Believing autouse fixtures need manual calls

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