[Solved] This fixture causes tests to fail with RuntimeError: Working outside of application context. What is missing?@pytest.fixture def client(): app = Flask(__name__) return app.test_client() | Flask

Flask - Testing Flask Applications

This fixture causes tests to fail with RuntimeError: Working outside of application context. What is missing?

@pytest.fixture
def client():
    app = Flask(__name__)
    return app.test_client()

AThe fixture must be marked with @pytest.mark.usefixtures

BThe fixture needs to push an application context

CThe Flask app must be imported from flask.testing

DThe fixture should use yield instead of return

Step-by-Step Solution

Solution:

Step 1: Understand Flask application context
Some Flask operations require an active app context to work.
Step 2: Identify missing context push in fixture
The fixture returns test client without pushing app context, causing error.
Final Answer:
The fixture needs to push an application context -> Option B
Quick Check:
Push app context to avoid RuntimeError [OK]

Quick Trick: Push app context in fixture before testing [OK]

Common Mistakes:

MISTAKES

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This fixture causes tests to fail with RuntimeError: Working outside of application context. What is missing?