Remove unused Cuprite-related code

The JavaScript driver for Capybara was being configured to use Cuprite to drive
a browser for JS-enabled specs. However, there are no such specs at the moment
and it's not obvious that there have ever been any.

When we added `js: true` to an existing feature spec and ran it, we saw an
exception, so it's not obvious that it was even working.

The feature specs currently use the default Capybara driver which is rack-test.
Since this doesn't drive a browser, it doesn't support screenshots, so we
removed the `capybara-screenshot` gem as well.

`Capybara.asset_host` is only relevant for browser-based specs and so it
doesn't need to be set any more.

The code that was checking for the browser binary by rescuing
`Ferrum::BinaryNotFoundError` is no longer needed, because Ferrum is the
lower-level gem used by Cuprite.

Currently if a JS-enabled spec is needed it's added to the e2e specs [1] which
use Python & Playwright. If we ever need to add JS-enabled specs to this repo,
it would probably make sense to use the Playwright driver for Capybara for
consistency with the e2e specs.

[1]: https://github.com/NHSDigital/manage-vaccinations-in-schools-testing/

Co-authored-by: Chris Lowis <chris.lowis@gofreerange.com>

Author: floehopper

Gemfile

@@ -118,9 +118,7 @@ group :test do
   gem "capybara"
   gem "capybara_accessible_selectors",
       github: "citizensadvice/capybara_accessible_selectors"
-  gem "capybara-screenshot"
   gem "climate_control"
-  gem "cuprite"
   gem "database_cleaner-active_record"
   gem "its"
   gem "rack_session_access"

Gemfile.lock

@@ -237,18 +237,13 @@ GEM
       rack-test (>= 0.6.3)
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
-    capybara-screenshot (1.0.27)
-      capybara (>= 1.0, < 4)
-      launchy
     caxlsx (4.4.2)
       htmlentities (~> 4.3, >= 4.3.4)
       marcel (~> 1.0)
       nokogiri (~> 1.10, >= 1.10.4)
       rubyzip (>= 2.4, < 4)
     cgi (0.5.1)
     charlock_holmes (0.7.9)
-    childprocess (5.1.0)
-      logger (~> 1.5)
     climate_control (1.2.0)
     coderay (1.1.3)
     concurrent-ruby (1.3.6)
@@ -271,9 +266,6 @@ GEM
     cssbundling-rails (1.4.3)
       railties (>= 6.0.0)
     csv (3.3.5)
-    cuprite (0.17)
-      capybara (~> 3.0)
-      ferrum (~> 0.17.0)
     data_migrate (11.3.1)
       activerecord (>= 6.1)
       railties (>= 6.1)
@@ -346,12 +338,6 @@ GEM
       faraday (>= 1, < 3)
     faraday-net_http (3.4.2)
       net-http (~> 0.5)
-    ferrum (0.17.1)
-      addressable (~> 2.5)
-      base64 (~> 0.2)
-      concurrent-ruby (~> 1.1)
-      webrick (~> 1.7)
-      websocket-driver (~> 0.7)
     ffi (1.17.3-arm64-darwin)
     ffi (1.17.3-x86_64-linux-gnu)
     fhir_models (5.0.0)
@@ -446,10 +432,6 @@ GEM
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     language_server-protocol (3.17.0.5)
-    launchy (3.1.1)
-      addressable (~> 2.8)
-      childprocess (~> 5.0)
-      logger (~> 1.6)
     lint_roller (1.1.0)
     listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
@@ -945,15 +927,13 @@ DEPENDENCIES
   bootsnap
   brakeman
   capybara
-  capybara-screenshot
   capybara_accessible_selectors!
   caxlsx
   charlock_holmes
   climate_control
   config
   cssbundling-rails
   csv
-  cuprite
   data_migrate
   database_cleaner-active_record
   debug

spec/spec_helper.rb

@@ -108,26 +108,11 @@
 end
 require "rspec/rails"
 # Add additional requires below this line. Rails is not loaded until this point!
-require "capybara/cuprite"
-require "capybara-screenshot/rspec"
 require "rack_session_access/capybara"
 require "console"
 
 Faker::Config.locale = "en-GB"
 
-Capybara.register_driver(:cuprite_custom) do |app|
-  Capybara::Cuprite::Driver.new(
-    app,
-    inspector: ENV["DEBUG_TESTS"],
-    js_errors: true,
-    window_size: [1200, 800],
-    process_timeout: 30
-  )
-end
-
-Capybara.asset_host = "http://localhost:4000"
-Capybara.javascript_driver = :cuprite_custom
-
 Console.logger.off!
 Capybara.server = :falcon
 
@@ -186,14 +171,6 @@
 
   config.filter_run_excluding :local_users
 
-  if ENV["CI"].blank?
-    begin
-      Ferrum::Browser.new
-    rescue Ferrum::BinaryNotFoundError
-      config.filter_run_excluding :js
-    end
-  end
-
   config.infer_spec_type_from_file_location!
 
   config.define_derived_metadata(file_path: %r{/spec/components/}) do |metadata|