Parallel testing in Nightwatch
Nightwatch supports running the tests in parallel in two main ways:
- via test workers
- by running multiple test environments in parallel
Via test workers
When this is enabled the test runner will launch a configurable number of child processes and then distribute the loaded tests over to be ran in parallel.
Test concurrency is done at the file level. Each test file will fill a test worker slot. Individual tests/steps in a test file will not run concurrently.
Multiple environments
Nightwatch also supports running tests across multiple browsers in parallel.
You can create a separate environment per browser (by chaining desiredCapabilities) and then run them in parallel. In addition, using the filter and exclude options tests can be split per environment in order to be ran in parallel.
Via workers + multiple environments
It is very useful to be able to run your tests against multiple browsers in parallel and also distribute your testcases across multiple workers. From v1.7 you are able to do just that.