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After running coverage, you see this error: CoverageException: No data to report. What should you check first?

medium📝 Debug Q7 of 15
Flask - Testing Flask Applications
After running coverage, you see this error: CoverageException: No data to report. What should you check first?
AIf pytest is installed
BIf Flask app is running on the right port
CWhether coverage was run with the correct command before reporting
DIf the HTML report folder exists
Step-by-Step Solution
Solution:

  1. Step 1: Understand the error meaning

    This error means coverage has no recorded data to generate a report.

  2. Step 2: Check coverage run step

    Ensure 'coverage run' was executed properly before 'coverage report' or 'coverage html'.

  3. Final Answer:

    Whether coverage was run with the correct command before reporting -> Option C

  4. Quick Check:

    No data error = missing coverage run step [OK]
Quick Trick: Run tests with coverage before generating reports [OK]
Common Mistakes:
MISTAKES
  • Checking Flask port instead of coverage commands
  • Assuming pytest installation causes this error
  • Looking for report folder before running coverage

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