Flickering test failures w/ Ember 2.18.2 & 3.4.7 about ember-fetch HOT 5 OPEN

@meirish The first step to help fix is to construct a minimal flaky test repro

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@walter thanks for remember me. I'll let my team know about your workaround. I guess we do not face this problem anymore since we've made another workaround for an issue on ember-graphql/ember-apollo-client#192, though - planning to send a PR to fix that soon.

from ember-fetch.

I spent a significant amount of time coming to the same conclusion with our test suites when we upgraded to Ember 3.6 with the use of the latest ember-simple-auth.

Would fail 25% of the time on authenticate, and move on to the next test step without finishing the login one.

Our authenticator made use of ember-fetch to make the authentication request.

I narrowed it down to the use of ember-fetch in the authenticator and the call to .json() on the response object.

Fairly often, the call to.json().then would end this promise chain and move on to the next step.
(In this screenshot, the first breakpoint is hit, the second one is missed, but the test suite continues)

I can confirm

'ember-fetch': {
  preferNative: true
}

is a valid work around for tests.

from ember-fetch.

We have the same problem in our app (ember-3.9.1). The preferNative workaround helps.

from ember-fetch.

We're seeing this as well, along with preferNative: true "fixing" things. Any way I can help debug / fix this?

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