Stabilize tests

app/assets/javascripts/hotwire_spark.js

@@ -3656,6 +3656,9 @@ var HotwireSpark = (function () {
   consumer.subscriptions.create({
     channel: "HotwireSpark::Channel"
   }, {
+    connected() {
+      document.body.setAttribute("data-hotwire-spark-ready", "");
+    },
     received(data) {
       this.dispatchMessage(data);
     },

app/javascript/hotwire_spark/channels/monitoring_channel.js

@@ -5,6 +5,10 @@ import { CssReloader } from "../reloaders/css_reloader.js";
 import { StimulusReloader } from "../reloaders/stimulus_reloader.js";
 
 consumer.subscriptions.create({ channel: "HotwireSpark::Channel" }, {
+  connected() {
+    document.body.setAttribute("data-hotwire-spark-ready", "")
+  },
+
   received(data) {
     this.dispatchMessage(data)
   },

test/application_system_test_case.rb

@@ -5,6 +5,12 @@ class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
   driven_by :cuprite, screen_size: [ 1440, 900 ], options: { headless: "new" }
 
   include HotwireSpark::Engine.routes.url_helpers
+
+  def visit(...)
+    super.tap do
+      wait_for_hotwire_spark
+    end
+  end
 end
 
 Capybara.server = :puma, { Silent: true }

test/errors_test.rb

@@ -0,0 +1,6 @@
+require "application_system_test_case"
+
+class ErrorsTest < ApplicationSystemTestCase
+  test "" do
+  end
+end

test/stimulus_reload_test.rb

@@ -15,6 +15,7 @@ class StimulusReloadTest < ApplicationSystemTestCase
     assert_no_text "This was replaced!"
 
     edit_file "app/views/home/show.html.erb", replace: "_REPLACE_CONTROLLER_", with: "other-dummy"
+    sleep 2 # Broadcasting many jobs in a row sometimes makes the test fail
 
     add_file "app/javascript/controllers/other_dummy_controller.js", <<~JS
       import { Controller } from "@hotwired/stimulus"

test/test_helper.rb

@@ -32,4 +32,8 @@ class ActiveSupport::TestCase
     def reload_rails_reloader
       Rails.application.reloader.reload!
     end
+
+    def wait_for_hotwire_spark
+      assert_css "[data-hotwire-spark-ready]"
+    end
 end