Set concurrency option to 1 when $TRAVIS = true

[diegohaz]

It seems like Travis CI doesn't handle multiple processes. I'm currently using this npm script to run tests: "test": "[ \"$TRAVIS\" ] && c=1 || c=5; ava -c $c"

But it doesn't work on Windows. I'm looking for a cross-platform conditional statement solution, but I'm wondering if this condition should be made on AVA itself.

Reference: diegohaz/rest#11

[sindresorhus]

I think that's specific to your tests. I use AVA with many projects and never experienced any problems with that. Did you figure it out?

[diegohaz]

Maybe. I'm using AVA with Mockgoose and for endpoint testing. Without concurrency option set to 1, I've experienced inconsistent errors like that: src/api/field/field.model.test.js exited due to SIGKILL.

I've read somewhere that Travis CI has a limit for multi processes, but I can't find it right now.

This is the output: https://travis-ci.org/diegohaz/generator-rest/jobs/159648372#L331-L346

[diegohaz]

I solved this by updating the travis.yml file (changing the script to npm test -- --serial). But the problem with multi processes is still an issue.

[sindresorhus]

If I were to guess, copying the node_modules folder in so many processes exhausted the memory limit. See: https://docs.travis-ci.com/user/common-build-problems/#My-build-script-is-killed-without-any-error

[diegohaz]

I don't think so. I'm currently creating symlinks instead of copying node_modules. I'll investigate it more, but I would like to see more examples with database mocking like Mockgoose. Creating a MongoDB instance, with all necessary models and indexes for each test (or even test file) seems to be a huge task.

[diegohaz]

I'm actually doing something similar to this: Mockgoose/Mockgoose#3 (comment)

[sindresorhus]

@diegohaz Does it also fail if you limit the concurrency to 5?

In #966, we're looking into setting a default concurrency. Right now it's unlimited.

[vadimdemedes]

Closing due to inactivity.

@diegohaz feel free to reply back whenever you have time and we'll reopen the issue ;)

[Dakuan]

I'm also having this issue on CircleCI...

my node_modules folder is 331mb, so you wouldn't need very many of them to trip up the server!

[darul75]

I confim having ava running tests with Travis in serial mode can fix that kind of issue

exited due to SIGKILL

Resolved with

ava --serial