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Parallel

Cucumber supports running scenarios in parallel. The main process becomes a "coordinator" and spins up several separate Node processes to be the "workers". You can enable this with the --parallel <NUMBER_OF_WORKERS> CLI option:

$ cucumber-js --parallel 3

The number you provide is the number of workers that will run scenarios in parallel.

Each worker receives the following env variables (as well as a copy of process.env from the coordinator process):

  • CUCUMBER_PARALLEL - set to 'true'
  • CUCUMBER_TOTAL_WORKERS - set to the number of workers
  • CUCUMBER_WORKER_ID - ID for worker ('0', '1', '2', etc.)

Timing

When using parallel mode, the last line of the summary output differentiates between real time elapsed during the test run and aggregate time spent actually running steps:

73 scenarios (73 passed)
512 steps (512 passed)
0m51.627s (executing steps: 4m51.228s)

Hooks

When using parallel mode, any BeforeAll and AfterAll hooks you have defined will run once per worker.