Limiting concurrency of tests

Description

I have about 15,000 tests that I run in a single file, each of which tests a url variant through supertest. If I run the tests with --serial, they pass. However, I can only run about a few hundred tests otherwise. After that, I guess that my server chokes and can’t handle that many requests at the same time, so the tests start failing with assorted supertest errors. The tests here naturally fit in a single file due to the setup:

pages.forEach(function (page) {
    variants.forEach(function (variant) {
        langs.forEach(function (lang) {
            test.cb(...supertest(page + variant + lang)...);
        });
    });
});

In this scenario I would like to limit the test concurrency rather than the currently supported file concurrency. I’m coming from mocha, so should I be handling these differently?

Environment

node 4.4.5
ava 0.16.0
npm 2.14.9

[sindresorhus]

@capaj This is about tests, not test files.

BTW I think ava should by default limit the number of concurrent tests to the number of available procesor cores on the current machine. That way optimal performance is achieved on my experience.

We might do that for test files (see open issue about it somewhere), but it does not make sense for tests.

[fatihaziz]

Any update for limiting the concurrency? I hope there is configuration for it…