Previously, `resetSite()` would immediately generate a new `Site` instance, and run all the initialization logic within the model. This included initializing Category objects.
This was problematic because `resetSite()` is called before any initializers have been run. That means that any modifications to the Site or Category classes would not have any effect on the already-initialized Site/Category instances.
This commit makes two main changes so so that the test environment is more production-like:
1. Update `resetSite` so that it simply stores the new data in the PreloadStore, and destroys the old Site instance. Initialization of a new site instance happens 'just in time' (normally during the `inject-discourse-objects` initializer)
2. Update the `helperContext` in tests to use getters. This avoids the need to look up `Site.current()` before initializers have run
It also makes a minor adjustment to one test which was relying on a side-effect of the previous behavior.
This should resolve the failing tests for discourse-category-expert under Ember-CLI: https://github.com/discourse/discourse-category-experts/pull/69
Using arrow functions changes `this` context, which is undesired in tests, e.g. it makes it impossible to setup things like pretender (`this.server`) in `beforeEach` hooks.
Ember guides always use classic functions in examples (e.g. https://guides.emberjs.com/release/testing/test-types/), and that's what it uses in its own test suite, as do various addons and ember apps.
It was also already used in Discourse where `this` was required. Moving forward, it will be needed in more places as we migrate toward ember-cli.
(I might later add a custom rule to eslint-discourse-ember to enforce this)
In newer Embers jQuery is removed. There is a `find` but it only returns
one element and not a jQuery selector. This patch migrates our code to a
new helper `queryAll` which allows us to remove the global.
We used many global functions to handle tests when they should be
imported like other libraries in our application. This also gets us
closer to the way Ember CLI prefers our tests to be laid out.
This is where they should be as far as ember is concerned. Note this is
a huge commit and we should be really careful everything continues to
work properly.
