Add logging for any JS error

Author: rmosolgo

spec/dummy/test/application_system_test_case.rb

@@ -3,4 +3,14 @@
 
 class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
   driven_by :selenium, using: :chrome, screen_size: [1400, 1400]
+
+  teardown do
+    # Adapted from https://medium.com/@coorasse/catch-javascript-errors-in-your-system-tests-89c2fe6773b1
+    errors = page.driver.browser.manage.logs.get(:browser)
+    if errors.present?
+      errors.each do |error|
+        assert_nil "#{error.level}: #{error.message}"
+      end
+    end
+  end
 end