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You wrote a Selenium Grid test script but noticed tests are running one after another, not in parallel. Which issue below is the most likely cause?

medium📝 Debug Q14 of 15
Selenium Python - Selenium Grid
You wrote a Selenium Grid test script but noticed tests are running one after another, not in parallel. Which issue below is the most likely cause?
AYou started only one Node connected to the Hub.
BYou used different browser types in tests.
CYou set the Hub URL incorrectly in the test script.
DYou used explicit waits in your test scripts.
Step-by-Step Solution
Solution:

  1. Step 1: Check Grid setup for parallelism

    Parallel execution requires multiple Nodes connected to the Hub.

  2. Step 2: Identify the cause of sequential runs

    If only one Node is connected, tests queue and run one by one.

  3. Final Answer:

    You started only one Node connected to the Hub. -> Option A

  4. Quick Check:

    Single Node = no parallel execution [OK]
Quick Trick: Multiple Nodes needed for parallel tests [OK]
Common Mistakes:
  • Blaming browser types for no parallelism
  • Confusing Hub URL errors with execution order
  • Thinking waits affect parallel execution

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