reproduction-vertical-collection

This repo represents a minimal reproduction of a bug in VerticalCollection that manifests when two vertical collections share a common container via containerSelector. This common container could be either the body element, or another element.

In this situation, the vertical collection will behave as expected when using the app, but will cause Application tests that await visit the route to hang on the visit promise.

Reproduction

• git clone <repository-url> this repository
• cd reproduction-vertical-collection
• npm install
• npx ember test

You should be able to observer a test timeout with test output resembling the following:

reproduction-vertical-collection (master) $ npx ember test
Environment: test
building...
cleaning up...
Built project successfully.
not ok 1 Chrome 81.0 - [120671 ms] - Acceptance: Trainer Reproduction of bug: When rendering two vertical collections with a shared container
    ---
        actual: >
            null
        stack: >
                at http://localhost:7357/assets/test-support.js:6288:8
        message: >
            Test took longer than 60000ms; test timed out.
        negative: >
            false
        browser log: |
    ...
ok 2 Chrome 81.0 - [1 ms] - ESLint | app: app.js
ok 3 Chrome 81.0 - [0 ms] - ESLint | app: router.js
ok 4 Chrome 81.0 - [0 ms] - TemplateLint: reproduction-vertical-collection/templates/application.hbs
ok 5 Chrome 81.0 - [0 ms] - TemplateLint: reproduction-vertical-collection/templates/repro.hbs
ok 6 Chrome 81.0 - [0 ms] - ESLint | tests: acceptance/reproduction-test.js
ok 7 Chrome 81.0 - [0 ms] - ESLint | tests: test-helper.js
ok 8 Chrome 81.0 - [0 ms] - ember-qunit: Ember.onerror validation: Ember.onerror is functioning properly

1..8
# tests 8
# pass  7
# skip  0
# fail  1
Testem finished with non-zero exit code. Tests failed.