force chrome to produce debug output as it runs in CI

.gitlab-ci.yml

@@ -448,13 +448,16 @@ karma:
   <<: *except-docs
   variables:
     BABEL_ENV: "coverage"
+    CHROME_LOG_FILE: "chrome_debug.log"
   script:
     - bundle exec rake karma
   coverage: '/^Statements *: (\d+\.\d+%)/'
   artifacts:
     name: coverage-javascript
     expire_in: 31d
+    when: always
     paths:
+    - chrome_debug.log
     - coverage-javascript/
 
 coverage:

config/karma.config.js

@@ -21,7 +21,14 @@ module.exports = function(config) {
 
   var karmaConfig = {
     basePath: ROOT_PATH,
-    browsers: ['ChromeHeadless'],
+    browsers: ['ChromeDebug'],
+    customLaunchers: {
+      ChromeDebug: {
+        base: 'ChromeHeadless',
+        flags: ['--enable-logging', '--v=1'],
+        displayName: 'Chrome'
+      }
+    },
     frameworks: ['jasmine'],
     files: [
       { pattern: 'spec/javascripts/test_bundle.js', watched: false },
@@ -33,6 +40,7 @@ module.exports = function(config) {
     reporters: [progressReporter],
     webpack: webpackConfig,
     webpackMiddleware: { stats: 'errors-only' },
+    logLevel: config.LOG_DEBUG,
   };
 
   if (process.env.BABEL_ENV === 'coverage' || process.env.NODE_ENV === 'coverage') {