## What is the problem?
MessageBus by default uses long polling which keeps a connection
open for 25 seconds by default. The problem here is that Capybara does not know about these
connections being kept opened by MessageBus and hence does not know how
to stop these connections at the end of each test. As a result, the long polling MessageBus connections are kept opened by the browser and we hit chrome's limit of 6 concurrent requests per host, new request made in the browser is marked as "pending" until a request is freed up. Since we keep a MessageBus long polling connection opened for 25 seconds, our finders in Capybara end up hitting Capybara's wait time out causing the tests to fail.
## What is the fix?
Since we can't rely on Capybara to close all the existing Capybara
connections, we manually execute a script to stop all MessageBus
connections after each system test.
```
for i in {1..10}; do
echo "Running iteration $i"
PARALLEL_TEST_PROCESSORS=8 CAPYBARA_DEFAULT_MAX_WAIT_TIME=10 bin/turbo_rspec --seed=34908 --profile --verbose --format documentation spec/system
if [ $? -ne 0 ]; then
echo "Error encountered on iteration $i"
exit 1
fi
done
echo "All 10 iterations completed successfully"
```
Without the fix, the script fails consistently in the first few iterations. Running in non-headless mode with the "network" tab opened will reveal the requests that are marked as pending.
In tests we could attempt to click the preview button when it was not enabled yet, causing a noop and a future failure. This fix ensures we try to find (and wait) for an enabled button.
This should help with this specific flakey:
```
Failures:
1) Admin Customize Form Templates when visiting the page to create a new form template should render all the input field types in the preview
Failure/Error: find(".form-template-field__#{type}").present?
Capybara::ElementNotFound:
Unable to find css ".form-template-field__input"
[Screenshot Image]: /__w/discourse/discourse/tmp/capybara/failures_r_spec_example_groups_admin_customize_form_templates_when_visiting_the_page_to_create_a_new_form_template_should_render_all_the_input_field_types_in_the_preview_277.png
~~~~~~~ JS LOGS ~~~~~~~
http://localhost:31339/favicon.ico - Failed to load resource: the server responded with a status of 404 (Not Found)
~~~~~ END JS LOGS ~~~~~
# ./vendor/bundle/ruby/3.2.0/gems/capybara-3.39.1/lib/capybara/node/finders.rb:312:in `block in synced_resolve'
# ./vendor/bundle/ruby/3.2.0/gems/capybara-3.39.1/lib/capybara/node/base.rb:84:in `synchronize'
# ./vendor/bundle/ruby/3.2.0/gems/capybara-3.39.1/lib/capybara/node/finders.rb:301:in `synced_resolve'
# ./vendor/bundle/ruby/3.2.0/gems/capybara-3.39.1/lib/capybara/node/finders.rb:60:in `find'
# ./vendor/bundle/ruby/3.2.0/gems/capybara-3.39.1/lib/capybara/session.rb:773:in `find'
# ./vendor/bundle/ruby/3.2.0/gems/capybara-3.39.1/lib/capybara/dsl.rb:52:in `call'
# ./vendor/bundle/ruby/3.2.0/gems/capybara-3.39.1/lib/capybara/dsl.rb:52:in `find'
# ./spec/system/page_objects/pages/form_template.rb:55:in `has_input_field?'
# ./spec/system/admin_customize_form_templates_spec.rb:114:in `block (3 levels) in <main>'
# ./spec/rails_helper.rb:368:in `block (3 levels) in <top (required)>'
# ./vendor/bundle/ruby/3.2.0/gems/timeout-0.3.2/lib/timeout.rb:189:in `block in timeout'
# ./vendor/bundle/ruby/3.2.0/gems/timeout-0.3.2/lib/timeout.rb:36:in `block in catch'
# ./vendor/bundle/ruby/3.2.0/gems/timeout-0.3.2/lib/timeout.rb:36:in `catch'
# ./vendor/bundle/ruby/3.2.0/gems/timeout-0.3.2/lib/timeout.rb:36:in `catch'
# ./vendor/bundle/ruby/3.2.0/gems/timeout-0.3.2/lib/timeout.rb:198:in `timeout'
# ./spec/rails_helper.rb:364:in `block (2 levels) in <top (required)>'
# ./spec/rails_helper.rb:356:in `block (2 levels) in <top (required)>'
# ./vendor/bundle/ruby/3.2.0/gems/webmock-3.18.1/lib/webmock/rspec.rb:37:in `block (2 levels) in <top (required)>'
```
In tests we could attempt to click the button before it was enabled and it could also not be visible on screen. This commits attempts to solve both problems.
It should solve this failure:
```
Failures:
1) Admin Customize Form Templates when visiting the page to create a new form template should allow admin to create a new form template
Failure/Error: find(".form-templates__table tbody tr td", text: name).present?
Capybara::ElementNotFound:
Unable to find css ".form-templates__table tbody tr td"
[Screenshot Image]: /__w/discourse/discourse/tmp/capybara/failures_r_spec_example_groups_admin_customize_form_templates_when_visiting_the_page_to_create_a_new_form_template_should_allow_admin_to_create_a_new_form_template_911.png
~~~~~~~ JS LOGS ~~~~~~~
http://localhost:31339/favicon.ico - Failed to load resource: the server responded with a status of 404 (Not Found)
~~~~~ END JS LOGS ~~~~~
# ./vendor/bundle/ruby/3.2.0/gems/capybara-3.39.1/lib/capybara/node/finders.rb:312:in `block in synced_resolve'
# ./vendor/bundle/ruby/3.2.0/gems/capybara-3.39.1/lib/capybara/node/base.rb:84:in `synchronize'
# ./vendor/bundle/ruby/3.2.0/gems/capybara-3.39.1/lib/capybara/node/finders.rb:301:in `synced_resolve'
# ./vendor/bundle/ruby/3.2.0/gems/capybara-3.39.1/lib/capybara/node/finders.rb:60:in `find'
# ./vendor/bundle/ruby/3.2.0/gems/capybara-3.39.1/lib/capybara/session.rb:773:in `find'
# ./vendor/bundle/ruby/3.2.0/gems/capybara-3.39.1/lib/capybara/dsl.rb:52:in `call'
# ./vendor/bundle/ruby/3.2.0/gems/capybara-3.39.1/lib/capybara/dsl.rb:52:in `find'
# ./spec/system/page_objects/pages/form_template.rb:21:in `has_form_template?'
# ./spec/system/admin_customize_form_templates_spec.rb:71:in `block (3 levels) in <main>'
# ./spec/rails_helper.rb:381:in `block (3 levels) in <top (required)>'
# ./vendor/bundle/ruby/3.2.0/gems/timeout-0.3.2/lib/timeout.rb:189:in `block in timeout'
# ./vendor/bundle/ruby/3.2.0/gems/timeout-0.3.2/lib/timeout.rb:36:in `block in catch'
# ./vendor/bundle/ruby/3.2.0/gems/timeout-0.3.2/lib/timeout.rb:36:in `catch'
# ./vendor/bundle/ruby/3.2.0/gems/timeout-0.3.2/lib/timeout.rb:36:in `catch'
# ./vendor/bundle/ruby/3.2.0/gems/timeout-0.3.2/lib/timeout.rb:198:in `timeout'
# ./spec/rails_helper.rb:377:in `block (2 levels) in <top (required)>'
# ./spec/rails_helper.rb:369:in `block (2 levels) in <top (required)>'
# ./vendor/bundle/ruby/3.2.0/gems/webmock-3.18.1/lib/webmock/rspec.rb:37:in `block (2 levels) in <top (required)>'
```
