React Native tests with pre-release native notifiers

[twometresteve]

Goal

Provides a mechanism for running integration test of the React Native notifier, using the pre-release Android and Cocoa notifiers from their respective next branches.

Design

The RN_INTEGRATION build environment variable can be set (to "true") either on a Buildkite schedule, trigger step, or when creating a build manually. If set, the pipeline will pull in and build the latest next version of bugsnag-android and bugsnag-cocoa before publishing the notifier. It will then run only the React Native e2e tests.

If run in this mode, the version for the published notifier is based on the current timestamp, rather than the current commit Id of bugsnag-js. Publishing is skipped if the same version is used as a previous build and even though bugsnag-js may not have changed, the native notifier may have.

An improvement to the current would be to somehow build in a check that the latest native notifiers really have been build in, but I couldn't think of a way to achieve that.

Testing

Covered by CI and inspection of the logs. I've also run it three times via a schedule.

[github-actions]

@bugsnag/browser bundle size diff

	Minified	Minfied + Gzipped
Before	40.86 kB	12.61 kB
After	40.86 kB	12.61 kB
±	No change	No change

code coverage diff

Coverage values did not change👌.

Total:

Lines	Branches	Functions	Statements
0%(+0%)	0%(+0%)	0%(+0%)	0%(+0%)

Generated by 🚫 dangerJS against 066497b

[nickdowell]

The logic LGTM, but I find RN_INTEGRATION to be quite a vague name, whereas something like BUILD_WITH_LATEST_NATIVE_NOTIFIERS would be more obvious 🙃

[bengourley]

Agree with Nick's comment about the env var name. Also a question about repeated builds/caching to avoid building exactly the same release more than once.

Otherwise LGTM.

[twometresteve]

The logic LGTM, but I find RN_INTEGRATION to be quite a vague name, whereas something like BUILD_WITH_LATEST_NATIVE_NOTIFIERS would be more obvious 🙃

Changing to BUILD_RN_WITH_LATEST_NATIVES - slightly shorter whilst also mentioning React Native.