Output UJs test failures in CI

Gemfile

@@ -95,7 +95,6 @@ gem "aws-sdk-sns", require: false
 gem "webmock"
 
 group :ujs do
-  gem "qunit-selenium"
   gem "webdrivers"
 end
 

Gemfile.lock

@@ -345,9 +345,6 @@ GEM
     puma (5.3.2)
       nio4r (~> 2.0)
     que (0.14.3)
-    qunit-selenium (0.0.4)
-      selenium-webdriver
-      thor
     raabro (1.4.0)
     racc (1.5.2)
     rack (2.2.3)
@@ -563,7 +560,6 @@ DEPENDENCIES
   puma
   que
   queue_classic!
-  qunit-selenium
   racc (>= 1.4.6)
   rack-cache (~> 1.2)
   rails!

ci/qunit-selenium-runner.rb

@@ -1,22 +1,81 @@
 # frozen_string_literal: true
 
-require "qunit/selenium/test_runner"
+require "webdrivers"
 
-if ARGV[1]
-  driver = ::Selenium::WebDriver.for(:remote, url: ARGV[1], desired_capabilities: :chrome)
+# This class based on https://github.com/smontanari/qunit-selenium, with a few tweaks to make it easier to read output.
+# Copyright (c) 2014 Silvio Montanari
+# License: MIT
+class TestRun
+  TestResult = Struct.new(:tests, :assertions, :duration, :raw_output)
+
+  ID_TESTRESULT = "qunit-testresult"
+  ID_TESTS = "qunit-tests"
+
+  def initialize(driver)
+    @qunit_testresult = driver[ID_TESTRESULT]
+    @qunit_tests = driver[ID_TESTS]
+  end
+
+  def completed?
+    @qunit_testresult.text =~ /Tests completed/
+  end
+
+  def result
+    assertions = { total: total_assertions, passed: passed_assertions, failed: failed_assertions }
+    tests = { total: total_tests, passed: pass_tests, failed: fail_tests }
+    TestResult.new(tests, assertions, duration, raw_output)
+  end
+
+  private
+    def raw_output
+      @qunit_tests.text
+    end
+
+    def duration
+      match = /Tests completed in (?<milliseconds>\d+) milliseconds/.match @qunit_testresult.text
+      match[:milliseconds].to_i / 1000
+    end
+
+    %w(total passed failed).each do |result|
+      define_method("#{result}_assertions".to_sym) do
+        @qunit_testresult.find_elements(:class, result).first.text.to_i
+      end
+    end
+
+    def total_tests
+      @qunit_tests.find_elements(:css, "##{ID_TESTS} > *").count
+    end
+
+    %w(pass fail).each do |result|
+      define_method("#{result}_tests".to_sym) do
+        @qunit_tests.find_elements(:css, "##{ID_TESTS} > .#{result}").count
+      end
+    end
+end
+
+driver = if ARGV[1]
+  ::Selenium::WebDriver.for(:remote, url: ARGV[1], desired_capabilities: :chrome)
 else
-  require "webdrivers"
-
   driver_options = Selenium::WebDriver::Chrome::Options.new
   driver_options.add_argument("--headless")
   driver_options.add_argument("--disable-gpu")
   driver_options.add_argument("--no-sandbox")
 
-  driver = ::Selenium::WebDriver.for(:chrome, options: driver_options)
+  ::Selenium::WebDriver.for(:chrome, options: driver_options)
 end
 
-result = QUnit::Selenium::TestRunner.new(driver).open(ARGV[0], timeout: 60)
+driver.get(ARGV[0])
+
+result = TestRun.new(driver).tap do |run|
+  ::Selenium::WebDriver::Wait.new(timeout: 60).until do
+    run.completed?
+  end
+end.result
+
 driver.quit
 
 puts "Time: #{result.duration} seconds, Total: #{result.assertions[:total]}, Passed: #{result.assertions[:passed]}, Failed: #{result.assertions[:failed]}"
+if result.tests[:failed] > 0
+  puts "Qunit output follows. Look for lines that have failures, eg (1, n, n) - those are your failing lines\r\n\r\n#{result.raw_output}"
+end
 exit(result.tests[:failed] > 0 ? 1 : 0)