Thread by @compiledwrong, skimming the capybara code for fun because what else is there to [...]

skimming the capybara code for fun because what else is there to do these days

What jumps out at me?

Capybara itself is a fairly small codebase! cloc says 253 .rb
Very small gemfile, nice

Lots of # rubocop:disable (87 matches in 47 files) but such is the library code life
Also I fully support arguing w/ rubocop at all times

# appveyor.yml
allow_failures:
- CAPYBARA_IE: true
- CAPYBARA_EDGE: true
lolllll fair enough

skip "Safari doesn't support multiple sessions" if safari?(session)
TIL

I use capybara to avoid sleep() and their tests have sleep

(legit)

it 'should bind to the specified host' do
# TODO: travis with jruby in container mode has an issue with this test

skip "safaridriver doesn't provide a way to set the download directory"

capybara/spec/selenium_spec_ie.rb what... happened here

it ' #right_click should allow modifiers' do
# pending "Actions API doesn't appear to work for this"

skip 'Broken in FF 63 - https://bugzilla.mozilla.org/show_bug.cgi?id=1487358

skip 'Hangs in 69 <= FF < 71 - Dont know what issue for this - previous issue was closed as fixed

1487358 - "Accept Alert" and "Dismiss Alert" should check for remaining user prompts

RESOLVED (hskupin) in Testing - Marionette. Last updated 2019-06-19.

https://bugzilla.mozilla.org/show_bug.cgi?id=1487358

this is the sausage getting MADE folks
this reminds me, I need to do a read-thru of react native soon, I commend my soul to any god who will take it?

# FF doesn't currently support datetime-local so this is really just a text input

xpath is glory (see next)

link_or_button: ".//a[./ @href] | .//input[./ @type = 'submit' or ./ @type = 'reset' or ./ @type = 'image' or ./ @type = 'button'] | .//button",

Oh hey there's a spec for https://saucelabs.com/

rspec
# This reads terribly, but must call #within
expect(find(:css, 'span.number').text.to_i).to within(1).of(41)

# This test is for a bug in jruby where `super` isn't defined correctly

Cross Browser Testing, Selenium Testing, Mobile Testing

The world's largest continuous testing cloud of web and mobile applications. Access web browsers, mobile emulators, simulators, and real mobile devices.

https://saucelabs.com/

# This test is for a bug in jruby where `super` isn't defined correctly - https://github.com/jruby/jruby/issues/4678
# Reported in https://github.com/teamcapybara/capybara/issues/2115

skip 'JRuby has an issue with lazy enumerator evaluation' if jruby_lazy_enumerator_workaround?

Crash on jruby due to matcher proxies hitting a jruby bug · Issue #2115 · teamcapybara/capybara

Hello! 👋 👋 So, I upgraded the activeadmin's spec environment to use latest capybara and specs on jruby started failing. I bisected the issue to df010d7. My guess is that it is due to jruby/...

https://github.com/jruby/jruby/issues/4678

why... are we deconstructing regexes
help

there is usage of https://github.com/rubys/nokogumbo which is new to my ken "a Nokogiri interface to the Gumbo HTML5 parser"

now THAT is a test (group) name y'all
describe 'threadsafe' do

the minitest tests are much shorter than the rspec tests, I feel like this is implicit commentary

rubys/nokogumbo

A Nokogiri interface to the Gumbo HTML5 parser. Contribute to rubys/nokogumbo development by creating an account on GitHub.

https://github.com/rubys/nokogumbo

oh wait no, that was minitest_spec_spec, now I am in minitest_spec

TIL
pending "Nokogiri doesn't support case insensitive CSS attribute matchers"

meep?
fscenario 'scenario should have focused meta tag' do |example|

having a test as a test fixture tickles me

# The {Window} class represents a browser window.

# Addressable parsing is more lenient than URI

# { https://dvcs.w3.org/hg/webdriver/raw-file/default/webdriver-spec.html#h_note_10 as order of windows isn't defined in some drivers}.

if RUBY_VERSION >= '2.7'

# Workaround issue where some platforms (mac, ???) when passed a host
# of '0.0.0.0' will return a port that is only available on one of the
# ip addresses that resolves to, but the next binding to that port requires
# that port to be available on all ips

# idx.max is broken with beginless ranges

JRuby < 9.2.8.0 has an issue with lazy enumerators which causes a concurrency issue with network requests here https://github.com/jruby/jruby/issues/4212

# RUBY 2.6 will send an empty hash rather than nothing with **options so fix that

Lazy enumerable select eagerly evaluates next item · Issue #4212 · jruby/jruby

Discovered by @twalpole in SeleniumHQ/selenium#2880. It appears our lazy enumerable logic is trying to evaluate the next item eagerly, or something... class A include Enumerable def initialize() @r...

https://github.com/jruby/jruby/issues/4212

def monotonic_time; Process.clock_gettime Process::CLOCK_MONOTONIC; end

# Workaround for emulating `warn '...', uplevel: n` in Ruby 2.5 or lower.

This file uses `sleep` to sync up parts of the tests ... tests using Capybara [should use] assertions with builtin waiting behavior.

IIFE! https://developer.mozilla.org/en-US/docs/Glossary/IIFE

I am very impressed with the tests
They are small, elegant, and thourough

I am learning a lot about how to use this thing by reading it, which I had not assumed would be the case

expect( @element).to match_css('span') { |el| el[:class] == 'number' }

@extended_app = extra_middleware.inject( @app) do |ex_app, klass|

if env['PATH_INFO'] == '/__identify__'

rescue *@server_errors => e

{ use_ssl: true, verify_mode: OpenSSL::SSL::VERIFY_NONE }

<script defer>(typeof jQuery !== 'undefined') && ( http://jQuery.fx.off = true);</sc

# Selenium specific implementation of the Capybara::Driver::Node API

gsub ... .tr("\\u00a0", ' ')

raise NotImplementedError, 'Out of browser drop emulation is not implemented for the current browser'

# Clear field by sending the correct number of backspace keys.

# TODO: this would be better if locale can be detected and correct keystrokes sent

driver.execute_script(<<-JS, self, value)

The action api has a speed problem but both chrome and firefox 58 raise errors if we use the faster direct send_keys.

(feel free to mute, I think I'm not quite halfway through)

# Only trigger a navigation if we haven't done it already, otherwise it can trigger an endless series of unload modals

::Selenium::WebDriver::Interactions::Pause.prepend PauseDurationFix

^ that my friends is known as a monkey-patch I believe

LOG_MSG = <<~MSG
Chromedriver 75+ defaults to W3C mode. Please upgrade to chromedriver >= \\
75.0.3770.90 if you need to access logs while in W3C compliant mode.

what... are atoms
::Selenium::WebDriver::Remote::Bridge.prepend CapybaraAtoms unless ENV['DISABLE_CAPYBARA_SELENIUM_OPTIMIZATIONS']

capybara/lib/capybara/selenium/nodes/safari_node.rb seems to be... in progress

whilst ie_node.rb is just... very short

# Firefox/marionette has an issue clicking with offset near viewport edge. scroll element to middle just in case

when String
# https://bugzilla.mozilla.org/show_bug.cgi?id=1405370

# In Chrome 75+ files are appended (due to WebDriver spec - why?) so we have to clear here if its multiple and alread

1405370 - Synthesized key event for "Shift" doesn't result in capitalized letters

RESOLVED (hskupin) in Testing - Marionette. Last updated 2018-09-25.

https://bugzilla.mozilla.org/show_bug.cgi?id=1405370

# W3C Chrome/chromedriver < 77 doesn't maintain mouse button state across actions API performs https://bugs.chromium.org/p/chromedriver/issues/detail?id=2981

there is a FIFO implementation here

LEGACY_DRAG_CHECK = <<~JS

// fire 2 dragover events to simulate dragging with a direction

@@is_displayed_atom ||= begin

# safaridriver/safari has an issue where switch_to_frame(:parent) behaves like switch_to_frame(:top)

# iedriverserver has an issue if the current frame is removed from within it
# so we have to move to the default_content and iterate back through the frames

# Firefox 68 hangs if we try to switch windows while a modal is visible

# Chromedriver doesn't wait long enough for state to change when coming out of fullscreen

where is your "Comments are always an apology" now, kid?

# Edgedriver crashes if attempt to clear storage on about:blank

aha, RegexpDisassembler

# delete_if is documented to modify the array after every block iteration - this doesn't appear to be true

y'all I feel like I'm getting older and wiser *rapidly* in here

Capybara::Helpers.warn "DEPRECATED: Passing a symbol (#{css.inspect}) as the CSS locator is deprecated - please pass a string instead

( http://value.is _a?(Regexp) ? value.match?(val) : val == http://value.to _s).tap do |res|

this is what peak perf looks like (meme

$Capybara::Helpers.warn "DEPRECATED: Passing a symbol (#{css.inspect}) as the CSS locator is deprecated - please pass a string instead( http://value.is _a?(Regexp) ? value.match?(val) : val == http://value.to _s).tap do |res|this is what peak perf looks like (meme$

else
cls = Array(classes).group_by { |cl| cl.match?(/^!(?!!!)/) }
[(cls[false].to_a.map { |cl| ".#{Capybara::Selector::CSS.escape(cl.sub(/^!!/, ''))}" } +
cls[true].to_a.map { |cl| ":not(.#{Capybara::Selector::CSS.escape(cl.slice(1..-1))})" }).join]

module SpatialSugar

Walpole I salute you

# If we just run the Puma Rack handler it installs signal handlers which prevent us from being able to interrupt tests.

# Workaround https://bugs.chromium.org/p/chromedriver/issues/detail?id=2650&q=load&sort=-id&colspec=ID%20Status%20Pri%20Owner%20Summary
opts.args << '--disable-site-isolation-trials'

The RackTest driver does not support click options

um rack wat
def request_method
/post/i.match?(self[:method] || '') ? :post : :get

VALID_KEYS = SPATIAL_KEYS + COUNT_KEYS +

vis = case visible
...
vis && case obscured

def distance_segment_segment(l1p1, l1p2, l2p1, l2p2)
# See http://geomalgorithms.com/a07-_distance.html

# A {Capybara::Node::Simple} ... is useful in that it does not require a session, an application or a driver, but can still use Capybara's finders and matchers on any string that contains HTML

# This method is Capybara's primary defence against asynchronicity problems. It works by attempting to run a given block of code until it succeeds.

rescue ::Capybara::NotSupportedByDriverError
# Implement for drivers that don't support JS

# This currently doesn't work for Ruby 2.8 due to Minitest not forwarding keyword args separately

# Execute the block, and then accept the modal opened.

gem 'pkg-config' # needed by nokogiri

there are Cucumber tests in here!

ooh, nice .github/lock.yml
Seems like a good idea for big projects

Well in summary, capybara is cool and fancy and I don't understand most of it, but now I know more about what it's made of and how to use it and a whole bunch of weird browser issues

--fin--

ooh, nice .github/lock.ymlSeems like a good idea for big projectsWell in summary, capybara is cool and fancy and I don't understand most of it, but now I know more about what it's made of and how to use it and a whole bunch of weird browser issues --fin--

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