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A test script runs fine in headed mode but fails in headless mode with timeout errors. What is a common cause?

medium📝 Debug Q7 of 15
Cypress - CI/CD and Reporting
A test script runs fine in headed mode but fails in headless mode with timeout errors. What is a common cause?
AHeadless mode uses a different test runner
BHeadless mode disables all network requests
CTests require manual input not possible in headless
DTests rely on UI animations that are slower or missing in headless
Step-by-Step Solution
Solution:

  1. Step 1: Understand difference between headed and headless

    Headless mode may run faster and skip UI animations, causing timing issues.

  2. Step 2: Identify cause of timeout errors

    Tests expecting animations or delays may fail due to missing UI effects in headless.

  3. Final Answer:

    Tests rely on UI animations that are slower or missing in headless -> Option D

  4. Quick Check:

    Timeouts in headless often due to missing UI animations [OK]
Quick Trick: Adjust waits for UI differences in headless mode [OK]
Common Mistakes:
  • Thinking headless disables network
  • Believing test runner changes
  • Assuming manual input is required

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