Add extra checks to web_terminal_spec

qa/qa/specs/features/browser_ui/3_create/web_ide/web_terminal_spec.rb

@@ -65,6 +65,7 @@ module QA
         #  a) The terminal JS package has loaded, and
         #  b) It's not stuck in a "Loading/Starting" state, and
         #  c) There's no alert stating there was a problem
+        #  d) There are no JS console errors
         #
         # The terminal itself is a third-party package so we assume it is
         # adequately tested elsewhere.
@@ -78,6 +79,17 @@ module QA
           expect(edit).to have_finished_loading
           expect(edit).to have_terminal_screen
         end
+
+        # It takes a few seconds for console errors to appear
+        sleep 3
+
+        errors = page.driver.browser.logs.get(:browser)
+                     .select { |e| e.level == "SEVERE" }
+                     .to_a
+
+        if errors.present?
+          raise("Console error(s):\n#{errors.join("\n\n")}")
+        end
       end
     end
   end