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It's possible for developers toadd a custom driver and then call it
using `driven_by`. Because we were only skipping `register` for
`:rack_test` that meant any custom driver would attempt to be registered
as well.
The three listed here are special because Rails registers them with
special options. If you're registering your own custom driver then you
don't want to separately register that driver.
Fixes #29688
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drivers.
When using `driver_by` with capybara-webkit or poltergeist,
SystemTesting::Driver will register the driver while passing
`screen_size` and `options` parameteres.
`options` could contain any option supported by the underlying driver.
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`visit "/"` will visit always "http://127.0.0.1" even when we call `host!`:
```ruby
class SomeTest < ApplicationSystemTest
def setup
host! "http://example.com"
end
def test_visit
visit root_url # => visit "http://example.com/"
visit "/" # => visit "http://127.0.0.1/"
end
end
```
Because Capybara assumes that host is same as the server if we don't set `Capybara.app_host`:
https://github.com/teamcapybara/capybara/blob/866c975076f92b5d064ee8998be638dd213f0724/lib/capybara/session.rb#L239
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Sometimes we want to use rack_test partially instead of selenium for test speed:
```ruby
class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
driven_by :selenium, using: :chrome, screen_size: [1400, 1400], options: {url: "http://chrome:4444/wd/hub"}
end
class WithJavaScriptTest < ApplicationSystemTestCase
end
class WithoutJavaScriptTest < ApplicationSystemTestCase
driven_by :rack_test
end
```
In the abobe case, `WithoutJavaScriptTest` uses selenium because
`SystemTestCase` calls superclass' driver on `#initialize` (`self.class.superclass.driver.use`).
Using `class_attribute` can handle inherited `driven_by`.
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Capybara drivers can handle some options such like `url`.
### before
```
# test/test_helper.rb
Capybara.register_driver :remote_chrome do |app|
Capybara::Selenium::Driver.new(app, browser: :chrome, url: "http://example.com/wd/hub")
end
# test/application_system_test_case.rb
class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
driven_by :remote_chrome
end
```
### after
```
# test/application_system_test_case.rb
class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
driven_by :selenium, using: :chrome, screen_size: [1400, 1400], options: {url: "http://chrome:4444/wd/hub"}
end
```
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Previously the system test subclasses would call `driven_by` when the
app booted and not again when the test was initialized which resulted in
the driver from whichever class was called last to be used in tests.
In rails/rails#28144 the `driven_by` method was changed to run `use` on
setup and `reset` on teardown. While this was a viable fix this really
pointed to the problem that system test `driven_by` was a global
setting, rather than a per-class setting.
To alieviate this problem calling the driver should be done on an
instance level, rather than on the global level. I added an `initialize`
method to `SystemTestCase` which will call `use` on the superclass
driver. Running the server has been moved to `start_application` so that
it only needs to be called once on boot and no options from `driven_by`
were being passed to it.
This required a largish rewrite of the tests. Each test needs to utilize
the subclass so that it can properly test the drivers.
`ActionDispatch::SystemTestCase` shouldn't be called directly anymore.
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Since using a browser is only for selenium it doesn't really make sense
to have a separate class for handling it there. This brings a lot of the
if/else out of the main SystemTestCase class and into the Driver class
so we can abstract away all that extra work.
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`Capybara::RackTest::Driver` does not support taking screenshots. If call
`#save_screenshot` on `Capybara::RackTest::Driver` will raise the error.
```ruby
Error:
UsersTest#test_visiting_the_index:
Capybara::NotSupportedByDriverError: Capybara::Driver::Base#save_screenshot
```
To prevent errors, if driver does not support screenshot, do not call it.
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Previously, `driven_by` would change the Capybara configuration when
the test case is loaded, and having multiple test classes with different
`driven_by` configs would fail as the last loaded would be effective.
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* Override integration test default host
Integration tests automatically set the default host to
'http://example.com'. This works fine for integration tests because they
are not real browser sessions, but doesn't work fine for system tests
because they are real browser sessions.
We can override this by setting the `host!` in `before_setup. The
`Capybara.always_include_port` will allow the test to look at
`127.0.0.1:port capybara picks` and properly redirect the test.
Any application can override this by setting the `host!` in
their system test helper. Generally though, applications are going to be
using localhost.
In this commit I also moved the setup and teardown into their own module
for tidiness.
* Move teardown settings into system test case
These configuration options can be put into the system test case file
instead of the generated system tests helper file. This is an
implementation detail and therefore shouldn't be generated with the
template.
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We only want the file name to include the word `failures` if it failed,
not any time the user wants to take a screenshot during a test run.
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* Move system tests back into Action Pack
* Rename `ActionSystemTest` to `ActionDispatch::SystemTestCase`
* Remove private base module and only make file for public
`SystemTestCase` class, name private module `SystemTesting`
* Rename `ActionSystemTestCase` to `ApplicationSystemTestCase`
* Update corresponding documentation and guides
* Delete old `ActionSystemTest` files
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