This commit introduces rails system tests run with chromedriver, selenium,
and headless chrome to our testing toolbox.
We use the `webdrivers` gem and `selenium-webdriver` which is what
the latest Rails uses so the tests run locally and in CI out of the box.
You can use `SELENIUM_VERBOSE_DRIVER_LOGS=1` to show extra
verbose logs of what selenium is doing to communicate with the system
tests.
By default JS logs are verbose so errors from JS are shown when
running system tests, you can disable this with
`SELENIUM_DISABLE_VERBOSE_JS_LOGS=1`
You can use `SELENIUM_HEADLESS=0` to run the system
tests inside a chrome browser instead of headless, which can be useful to debug things
and see what the spec sees. See note above about `bin/ember-cli` to avoid
surprises.
I have modified `bin/turbo_rspec` to exclude `spec/system` by default,
support for parallel system specs is a little shaky right now and we don't
want them slowing down the turbo by default either.
### PageObjects and System Tests
To make querying and inspecting parts of the page easier
and more reusable inbetween system tests, we are using the
concept of [PageObjects](https://www.selenium.dev/documentation/test_practices/encouraged/page_object_models/) in
our system tests. A "Page" here is generally corresponds to
an overarching ember route, e.g. "Topic" for `/t/324345/some-topic`,
and this contains logic for querying components within the topic
such as "Posts".
I have also split "Modals" into their own entity. Further down the
line we may want to explore creating independent "Component"
contexts.
Capybara DSL should be included in each PageObject class,
reference for this can be found at https://rubydoc.info/github/teamcapybara/capybara/master#the-dsl
For system tests, since they are so slow, we want to focus on
the "happy path" and not do every different possible context
and branch check using them. They are meant to be overarching
tests that check a number of things are correct using the full stack
from JS and ember to rails to ruby and then the database.
### CI Setup
Whenever a system spec fails, a screenshot
is taken and a build artifact is produced _after the entire CI run is complete_,
which can be downloaded from the Actions UI in the repo.
Most importantly, a step to build the Ember app using Ember CLI
is needed, otherwise the JS assets cannot be found by capybara:
```
- name: Build Ember CLI
run: bin/ember-cli --build
```
A new `--build` argument has been added to `bin/ember-cli` for this
case, which is not needed locally if you already have the discourse
rails server running via `bin/ember-cli -u` since the whole server is built and
set up by default.
Co-authored-by: David Taylor <david@taylorhq.com>
Both versions are used with `--headless`, so labelling one "Firefox" and the other "Firefox Headless" doesn't really make sense. Evergreen / ESR are better descriptions.
We added `always()` on some steps so that they run even if previous steps fail. That helps give us a picture of all failures in one run, rather than having to re-run the workflow after fixing the first failure.
However, when we explicitly cancel a job, we should skip running these steps. `!cancelled()` is a better substitute for `always()` in this case.
When `EMBER_CLI_PLUGIN_ASSETS=1`, plugin application JS will be compiled via Ember CLI. In this mode, the existing `register_asset` API will cause any registered JS files to be made available in `/plugins/{plugin-name}_extra.js`. These 'extra' files will be loaded immediately after the plugin app JS file, so this should not affect functionality.
Plugin compilation in Ember CLI is implemented as an addon, similar to the existing 'admin' addon. We bypass the normal Ember CLI compilation process (which would add the JS to the main app bundle), and reroute the addon Broccoli tree into a separate JS file per-plugin. Previously, Sprockets would add compiled templates directly to `Ember.TEMPLATES`. Under Ember CLI, they are compiled into es6 modules. Some new logic in `discourse-boot.js` takes care of remapping the new module names into the old-style `Ember.TEMPLATES`.
This change has been designed to be a like-for-like replacement of the old plugin compilation system, so we do not expect any breakage. Even so, the environment variable flag will allow us to test this in a range of environments before enabling it by default.
A manual silence implementation is added for the build-time `ember-glimmer.link-to.positional-arguments` deprecation while we work on a better story for plugins.
Each test chunk takes about 10 minutes, so those timeouts can be decreased from 20 to 15.
And there are three of those chunks so total can be a bit over 30 minutes, hence the bump to 35.
Anyone still using `EMBER_CLI_PROD_ASSETS=0` in development or production will be gracefully switched to Ember CLI. In development, a repeated message will be logged to STDERR.
Similarly, passing `QUNIT_EMBER_CLI=0` to the qunit rake task will now do nothing. A warning will be printed, and ember-cli mode will be used. Note that we've chosen not to fail the task, so that existing plugin/theme CI jobs don't immediately start failing. We may switch to a hard fail in the coming days/weeks.
`run-qunit.js` does not expect QUnit tests to start automatically but
our wizard QUnit setup did not respect the `qunit_disable_auto_start`
URL param. Hence, tests would start running automatically and when a
subsequent `QUnit.start()` function call is made, we ended up getting a
`QUnit.start cannot be called inside a test context.` error.
This error can be consistently reproduced in the `discourse:discourse_test` container but not in
the local development environment. I do not know why and did not feel
like it is important at this point in time to know why.
Previously, if Core QUnit 1 failed, then QUnit 2/3 wouldn't even be attempted. When dealing with multiple failures, this can make the feedback cycle. Setting `if: always()` ensures that the steps run regardless of any earlier failures. This is the same approach we take in the linting workflow.
We have 3 branches which we care about, `main`, `beta` and `stable`.
However, each of this branch has different compatibilties with plugins
and we want to respect that.
This reverts commit f43bba8d59.
Adding randomness has introduced a lot of flakiness in our ember-cli tests. We should fix those issues at the source. However, given the upcoming stable release, this randomness has been reverted so that the stable release includes a stable test suite. Having a stable test suite on stable will make backporting future commits much easier.
- Move ember-cli tests into the main test workflow, so they're listed alongside other tests
- Remove the 'experimental' label
- Add the 'legacy' label to old-style qunit tests
- Add core-plugin EmberCLI tests
- Add scaffolding for all-plugin EmberCLI tests, but disable in matrix for now
The discourse base image already contains a postgres installation, so pulling a separate postgres image is a little wasteful. Using the copy of Postgres in the discourse image saves about 20 seconds on every GitHub actions run.
This commit sets up Postgres with a few performance-improving flags, which we were already using for the `rake docker:test` task (used on our internal CI system).
A cached database (and its uploads) will only be used if the current run has exactly the same set of migration files. Otherwise, the database will be migrated from scratch
This saves approximately 75s on the core backend specs and 45s on other runs.
