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After setting up Cypress to run tests in parallel, you notice all tests execute sequentially on a single machine. What is the most probable reason?

medium📝 Debug Q6 of 15
Cypress - CI/CD and Reporting
After setting up Cypress to run tests in parallel, you notice all tests execute sequentially on a single machine. What is the most probable reason?
AThe tests contain syntax errors preventing parallel execution
BThe Cypress Dashboard project is not linked or recording is disabled
CThe machine does not have enough CPU cores
DThe test files are too small to split
Step-by-Step Solution
Solution:
  1. Step 1: Check parallel execution requirements

    Cypress requires a linked Dashboard project and recording enabled to split tests across machines.
  2. Step 2: Identify cause of sequential execution

    If recording is disabled or the project is not linked, tests run sequentially despite parallel flags.
  3. Final Answer:

    The Cypress Dashboard project is not linked or recording is disabled -> Option B
  4. Quick Check:

    Is Dashboard linking required for parallel runs? Yes [OK]
Quick Trick: Parallel needs Dashboard project linked and recording enabled [OK]
Common Mistakes:
  • Blaming test syntax errors for lack of parallelism
  • Assuming CPU cores alone enable parallel execution
  • Thinking test file size affects parallel splitting

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