Complete advanced testing setup

Guardfile

+require 'active_support/core_ext/string'
+# Defines the matching rules for Guard.
+guard :minitest, spring: "bin/rails test", all_on_start: false do
+  watch(%r{^test/(.*)/?(.*)_test\.rb$})
+  watch('test/test_helper.rb') { 'test' }
+  watch('config/routes.rb') { interface_tests }
+  watch(%r{app/views/layouts/*}) { interface_tests }
+  watch(%r{^app/models/(.*?)\.rb$}) do |matches|
+    ["test/models/#{matches[1]}_test.rb",
+     "test/integration/microposts_interface_test.rb"]
+  end
+  watch(%r{^test/fixtures/(.*?)\.yml$}) do |matches|
+    "test/models/#{matches[1].singularize}_test.rb"
+  end
+  watch(%r{^app/mailers/(.*?)\.rb$}) do |matches|
+    "test/mailers/#{matches[1]}_test.rb"
+  end
+  watch(%r{^app/views/(.*)_mailer/.*$}) do |matches|
+    "test/mailers/#{matches[1]}_mailer_test.rb"
+  end
+  watch(%r{^app/controllers/(.*?)_controller\.rb$}) do |matches|
+    resource_tests(matches[1])
+  end
+  watch(%r{^app/views/([^/]*?)/.*\.html\.erb$}) do |matches|
+    ["test/controllers/#{matches[1]}_controller_test.rb"] +
+    integration_tests(matches[1])
+  end
+  watch(%r{^app/helpers/(.*?)_helper\.rb$}) do |matches|
+    integration_tests(matches[1])
+  end
+  watch('app/views/layouts/application.html.erb') do
+    'test/integration/site_layout_test.rb'
+  end
+  watch('app/helpers/sessions_helper.rb') do
+    integration_tests << 'test/helpers/sessions_helper_test.rb'
+  end
+  watch('app/controllers/sessions_controller.rb') do
+    ['test/controllers/sessions_controller_test.rb',
+     'test/integration/users_login_test.rb']
+  end
+  watch('app/controllers/account_activations_controller.rb') do
+    'test/integration/users_signup_test.rb'
+  end
+  watch(%r{app/views/users/*}) do
+    resource_tests('users') +
+    ['test/integration/microposts_interface_test.rb']
+  end
+end
+
+# Returns the integration tests corresponding to the given resource.
+def integration_tests(resource = :all)
+  if resource == :all
+    Dir["test/integration/*"]
+  else
+    Dir["test/integration/#{resource}_*.rb"]
+  end
+end
+
+# Returns all tests that hit the interface.
+def interface_tests
+  integration_tests << "test/controllers"
+end
+
+# Returns the controller tests corresponding to the given resource.
+def controller_test(resource)
+  "test/controllers/#{resource}_controller_test.rb"
+end
+
+# Returns all tests for the given resource.
+def resource_tests(resource)
+  integration_tests(resource) << controller_test(resource)
+end
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test/test_helper.rb

 ENV['RAILS_ENV'] ||= 'test'
 ENV['RAILS_ENV'] ||= 'test'
-require_relative "../config/environment"
-require "rails/test_help"
+require_relative '../config/environment'
+require 'rails/test_help'
 require "minitest/reporters"
 require "minitest/reporters"
 Minitest::Reporters.use!
 Minitest::Reporters.use!
-
 class ActiveSupport::TestCase
 class ActiveSupport::TestCase
-  # Run tests in parallel with specified workers
-  parallelize(workers: :number_of_processors)
-
-  # Setup all fixtures in test/fixtures/*.yml for all tests in alphabetical order.
-  fixtures :all
-
-  # Add more helper methods to be used by all tests here...
+# Run tests in parallel with specified workers
+parallelize(workers: :number_of_processors)
+# Setup all fixtures in test/fixtures/*.yml for all tests in alphabetical order.
+fixtures :all
+# Add more helper methods to be used by all tests here...
 end
 end
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