diff --git a/Gemfile b/Gemfile
index d22621df..70a83485 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,12 +9,17 @@ group :development, :test do
   gem 'pry-byebug' unless ENV['CI']
 end
 
-# We allow testing under multiple versions of Rails by setting ENV RAILS_VERSION,
-# used in CI, can be used locally too. Make sure to delete your Gemfile.lock after
-# changing a local RAILS_VERSION
+# == Extra dependencies for dummy test app ==
+#
+# Extra dependencies for dummy test app are in .gemspec as a development dependency
+# where possible. But when  dependencies vary for different versions
+# of Rails, rails-version-specific dependencies are here, behind conditionals, for now.
 #
 # TODO switch to use appraisal gem instead, encapsulating these different additional
 # dependencies per Rails version, as well as method of choosing operative rails version.
+#
+# We allow testing under multiple versions of Rails by setting ENV RAILS_VERSION,
+# used in CI, can be used locally too.
 
 # Set a default RAILS_VERSION so we make sure to get extra dependencies for it...
 
@@ -44,7 +49,6 @@ if ENV['RAILS_VERSION']
     gem "mail", ">= 2.8.0.rc1"
   when /^6\.0\./
     gem 'sass-rails', '>= 6'
-    gem 'webpacker', '~> 4.0'
   when /^5\.[12]\./
     gem 'sass-rails', '~> 5.0'
     gem 'sprockets', '~> 3.7'
diff --git a/README.md b/README.md
index 62a44421..ba76745e 100644
--- a/README.md
+++ b/README.md
@@ -284,9 +284,7 @@ Or individually, `bundle exec rubocop`, `bundle exec rspec`.
 
 You can test with different versions of rails by setting ENV variable `RAILS_VERSION` to a specific version like `"6.1.2"` or `"7.0.0"`, perhaps by `export RAILS_ENV=7.0.0` to set it in your shell session.
 
-Tests by default will be run with bootstrap-4 integration. You can test with bootstrap-3 by setting ENV varaible `TEST_BOOTSTRAP=3`.
-
-After changing `RAILS_VERSION` or `TEST_BOOTSTRAP` you may have to run `rm Gemfile.lock` and `bundle install` again. If you get a `Bundler could not find compatible versions...` error, for instance.
+After changing `RAILS_VERSION` you may have to run `rm Gemfile.lock` and `bundle install` again. If you get a `Bundler could not find compatible versions...` error, for instance.
 
 # Help
 
diff --git a/browse-everything.gemspec b/browse-everything.gemspec
index 19d3a220..b6250ddd 100644
--- a/browse-everything.gemspec
+++ b/browse-everything.gemspec
@@ -29,11 +29,17 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'signet', '~> 0.8'
   spec.add_dependency 'typhoeus'
 
+  # Development dependencies include dependencies necessary for running
+  # the dummy test app at ./spec/dummy_test_app
+
   spec.add_development_dependency 'bixby', '~> 5.0'
+  spec.add_development_dependency 'bootstrap', "~> 4.0" # we do not support bootstrap 5
   spec.add_development_dependency 'bundler', '>= 1.3'
   spec.add_development_dependency 'capybara'
   spec.add_development_dependency 'factory_bot_rails'
+  spec.add_development_dependency 'jquery-rails'
   spec.add_development_dependency 'pry-byebug'
+  spec.add_development_dependency 'puma'
   spec.add_development_dependency 'rails-controller-testing'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rspec', '~> 3.0'
@@ -41,8 +47,10 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rspec-rails'
   spec.add_development_dependency 'rspec_junit_formatter'
   spec.add_development_dependency 'rubocop-rspec'
+  spec.add_development_dependency 'sass-rails'
   spec.add_development_dependency 'selenium-webdriver'
   spec.add_development_dependency 'sqlite3'
+  spec.add_development_dependency 'turbolinks'
   spec.add_development_dependency 'webdrivers'
   spec.add_development_dependency 'webmock'
 end
diff --git a/spec/dummy_test_app/app/assets/config/manifest.js b/spec/dummy_test_app/app/assets/config/manifest.js
index c8e290cd..1983ee4e 100644
--- a/spec/dummy_test_app/app/assets/config/manifest.js
+++ b/spec/dummy_test_app/app/assets/config/manifest.js
@@ -1,4 +1,3 @@
-
 //= link_tree ../images
-//= link_directory ../javascripts .js
-//= link_directory ../stylesheets .css
+//= link application.css
+//= link application.js
diff --git a/spec/dummy_test_app/app/assets/javascripts/application.js b/spec/dummy_test_app/app/assets/javascripts/application.js
index e54c6461..650abb23 100644
--- a/spec/dummy_test_app/app/assets/javascripts/application.js
+++ b/spec/dummy_test_app/app/assets/javascripts/application.js
@@ -10,4 +10,16 @@
 // Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
 // about supported directives.
 //
+
+// We want to test with turbolinks, which our code also requires rails-ujs to deal with:
+
+//= require rails-ujs
+//= require turbolinks
+
+// Actual stack required for current browse-everything JS
+
+//= require jquery3
+//= require bootstrap
+//= require browse_everything
+
 //= require_tree .
diff --git a/spec/dummy_test_app/app/assets/stylesheets/application.css b/spec/dummy_test_app/app/assets/stylesheets/application.scss
similarity index 90%
rename from spec/dummy_test_app/app/assets/stylesheets/application.css
rename to spec/dummy_test_app/app/assets/stylesheets/application.scss
index 0ebd7fe8..59543e08 100644
--- a/spec/dummy_test_app/app/assets/stylesheets/application.css
+++ b/spec/dummy_test_app/app/assets/stylesheets/application.scss
@@ -13,3 +13,6 @@
  *= require_tree .
  *= require_self
  */
+
+@import "bootstrap";
+@import "browse_everything/browse_everything_bootstrap4";
diff --git a/spec/dummy_test_app/app/controllers/file_handler_controller.rb b/spec/dummy_test_app/app/controllers/file_handler_controller.rb
new file mode 100644
index 00000000..0000269e
--- /dev/null
+++ b/spec/dummy_test_app/app/controllers/file_handler_controller.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class FileHandlerController < ApplicationController
+  def index; end
+
+  def main; end
+
+  def update
+    render json: params[:selected_files].to_json
+  end
+end
diff --git a/spec/dummy_test_app/app/views/file_handler/index.html.erb b/spec/dummy_test_app/app/views/file_handler/index.html.erb
new file mode 100644
index 00000000..7ae1c43a
--- /dev/null
+++ b/spec/dummy_test_app/app/views/file_handler/index.html.erb
@@ -0,0 +1,10 @@
+<div class="panel panel-default">
+  <div class="panel-body">
+    <a href="main" class="btn btn-large btn-primary" role="button">Enter Test App (Turbolinks)</a>
+
+    <%# this doesn't REALLY test no Turbolinks, as there will still be a `window.Turbolinks` object,
+        and a `turbolinks:load` event. It just tests as if the page we are navigating to were the FIRST
+        page loaded under turbolinks %>
+    <a href="main" class="btn btn-large btn-primary" role="button" data-turbolinks="false" data-no-turbolink>Enter Test App (No Turbolinks)</a>
+  </div>
+</div>
diff --git a/spec/dummy_test_app/app/views/file_handler/main.html.erb b/spec/dummy_test_app/app/views/file_handler/main.html.erb
new file mode 100644
index 00000000..9478bc53
--- /dev/null
+++ b/spec/dummy_test_app/app/views/file_handler/main.html.erb
@@ -0,0 +1,25 @@
+<div class="jumbotron">
+  <h1>Welcome!</h1>
+
+  <p>Please click the button below to start pickin' files!</p>
+
+  <%= form_tag('/file', id: 'main_form', method: 'post') do %>
+    <%= button_tag("Browse", type: 'button', class: 'btn btn-large btn-success', id: "browse-btn",
+      'data-toggle' => 'browse-everything', 'data-route' => browse_everything_engine.root_path,
+      'data-target' => '#main_form') %>
+    <%= button_tag("Submit", type: 'submit', class: 'btn btn-large btn-primary', id: "submit-btn") %>
+  <% end %>
+
+  <p id="status">0 items selected</p>
+
+  <script>
+    $(document).on('turbolinks:load', function() {
+      // Have to make sure onReady is ALSO passed, in case it's first load.
+      $(function() {
+        $('#browse-btn').browseEverything()
+          .done(function(data) { $('#status').html(data.length.toString() + " items selected") })
+          .cancel(function()   { window.alert('Canceled!') });
+      });
+    });
+  </script>
+</div>
diff --git a/spec/dummy_test_app/config/application.rb b/spec/dummy_test_app/config/application.rb
index 7c35c770..ab8e2442 100644
--- a/spec/dummy_test_app/config/application.rb
+++ b/spec/dummy_test_app/config/application.rb
@@ -5,6 +5,14 @@
 Bundler.require(*Rails.groups)
 require "browse_everything"
 
+# Since we don't actually have an app-specific Gemfile,
+# Some development dependencies listed in .gemspec need to be required here,
+# that would ordinarily be auto-required by being in a Gemfile instead of gemspec.
+require 'bootstrap'
+require 'sprockets/railtie'
+require 'jquery-rails'
+require 'turbolinks'
+
 module Dummy
   class Application < Rails::Application
     # ~Initialize configuration defaults for originally generated Rails version.~
diff --git a/spec/dummy_test_app/config/routes.rb b/spec/dummy_test_app/config/routes.rb
index fe2d33b8..7a9bc627 100644
--- a/spec/dummy_test_app/config/routes.rb
+++ b/spec/dummy_test_app/config/routes.rb
@@ -1,4 +1,9 @@
 Rails.application.routes.draw do
   # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
   mount BrowseEverything::Engine => '/browse'
+
+  # Custom actions we use for feature testing
+  root :to => "file_handler#index"
+  get '/main', :to => "file_handler#main"
+  post '/file', :to => "file_handler#update"
 end
diff --git a/spec/features/select_files_spec.rb b/spec/features/select_files_spec.rb
index 4ae171a0..8a29f365 100644
--- a/spec/features/select_files_spec.rb
+++ b/spec/features/select_files_spec.rb
@@ -7,7 +7,7 @@
 
   shared_examples 'browseable files' do
     # This is a work-around until the support for Webpacker is resolved
-    xit 'selects files from the filesystem' do
+    it 'selects files from the filesystem' do
       click_button('Browse')
       wait_for_ajax
 
diff --git a/spec/features/test_compiling_stylesheets_spec.rb b/spec/features/test_compiling_stylesheets_spec.rb
index 1cbf3ca9..200b71fc 100644
--- a/spec/features/test_compiling_stylesheets_spec.rb
+++ b/spec/features/test_compiling_stylesheets_spec.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 describe 'Compiling the stylesheets', type: :feature, js: true do
-  xit 'does not raise errors' do
+  it 'does not raise errors' do
     visit '/'
     expect(page).not_to have_content 'Sass::SyntaxError'
   end