CODEWITHSUNDEEP
ruby-on-rails
Avdi
Avdi

Reputation: 18418

How to disable Rails test parallelization *just* for system tests?

I'm finding that the default test parallelization makes chromedriver tests highly unreliable. But I'd like to keep other tests parallel.

I've tried this in application_system_test_case.rb:

class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
  parallelize(workers: 1)
  # ...
end

...but it doesn't seem to override the default.

I'm currently using:

PARALLEL_WORKERS=1 rails test:system

...but I'm looking for a way to hardcode this into the project in such a way that someone else doesn't have to "just know" to always set that env var for system tests.

Upvotes: 15

Views: 1823

Answers (2)

wisetara
wisetara

Reputation: 95

I agree that maybe having a separate script for groups of tests.

Something like:

/system_tests.sh

#!/bin/bash
set -e

# run tests
time npm test -- --maxWorkers=1

rspec --pattern "spec/system/*_spec.rb"



/all_other_tests.sh
#!/bin/bash
set -e

# run tests
time npm test -- --maxWorkers=8

rspec --p --exclude-pattern "spec/system/**"

Something along those lines, and then calling each script from your CI config. I'm guessing this question is long-answered, but perhaps the answer and some options to think about and config for oneself will be useful for someone else.

Upvotes: 0

Dorian
Dorian

Reputation: 9085

I would run two separate process, e.g. a bin/test with:

#!/bin/bash

set -e

rails test test/models test/controllers ...

PARALLEL_WORKERS=1 rails test:system

Or maybe fix the root cause of the flakiness of the system tests running in parallel

Upvotes: 3

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