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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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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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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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* 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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