You have a fixture in conftest.py that establishes a database connection. To minimize connection overhead when running tests across multiple files, which fixture scope is most appropriate?
hard🚀 Application Q8 of 15
PyTest - Fixtures
You have a fixture in conftest.py that establishes a database connection. To minimize connection overhead when running tests across multiple files, which fixture scope is most appropriate?
Ascope='function' to create a new connection per test
Bscope='module' to share connection within a single test file
Cscope='class' to share connection within test classes only
Dscope='session' to share connection across all tests in the session
Step-by-Step Solution
Solution:
Step 1: Understand fixture scopes
Function scope creates a new fixture instance per test; module scope per test file; class scope per test class; session scope once per test session.
Step 2: Consider resource cost
Database connections are expensive to create and tear down.
Step 3: Choose optimal scope
Using scope='session' allows sharing the connection across all tests, minimizing overhead.
Final Answer:
scope='session' to share connection across all tests in the session is the best choice for resource optimization.
Quick Check:
Session scope shares fixture across entire test run [OK]
Quick Trick:Use session scope for expensive shared resources [OK]
Common Mistakes:
MISTAKES
Using function scope causing repeated setup/teardown
Choosing module scope limiting sharing to one file
Assuming class scope covers all tests
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