Add tests for system testing

* Adds test case test
* Adds driver adapter test
* Adds tests for capybara seleium driver (testing the settings not
actually opening the browser to test capybara w/ selenium because that
would so so so slow)
* Adds tests for rack test driver
* Adds tests for generators

5 files changed, 105 insertions, 0 deletions

diff --git a/actionpack/actionpack.gemspec b/actionpack/actionpack.gemspec
index 2c24a54305..bb9079dc1c 100644
--- a/actionpack/actionpack.gemspec
+++ b/actionpack/actionpack.gemspec
@@ -26,6 +26,7 @@ Gem::Specification.new do |s|
   s.add_dependency "rails-html-sanitizer", "~> 1.0", ">= 1.0.2"
   s.add_dependency "rails-dom-testing", "~> 2.0"
   s.add_dependency "actionview", version
+  s.add_dependency "capybara", "~> 2.7.0"
 
   s.add_development_dependency "activemodel", version
 end
diff --git a/actionpack/test/abstract_unit.rb b/actionpack/test/abstract_unit.rb
index 459b0d6c54..3b35af6d3a 100644
--- a/actionpack/test/abstract_unit.rb
+++ b/actionpack/test/abstract_unit.rb
@@ -33,6 +33,7 @@ require "action_view/testing/resolvers"
 require "action_dispatch"
 require "active_support/dependencies"
 require "active_model"
+require "system_test_case"
 
 require "pp" # require 'pp' early to prevent hidden_methods from not picking up the pretty-print methods until too late
 
diff --git a/actionpack/test/system_testing/capybara_rack_test_driver_test.rb b/actionpack/test/system_testing/capybara_rack_test_driver_test.rb
new file mode 100644
index 0000000000..0f037760d3
--- /dev/null
+++ b/actionpack/test/system_testing/capybara_rack_test_driver_test.rb
@@ -0,0 +1,26 @@
+require 'abstract_unit'
+
+class CapybaraRackTestDriverTest < ActiveSupport::TestCase
+  def test_default_driver_adapter
+    assert_kind_of SystemTesting::DriverAdapters::CapybaraRackTestDriver, Rails::SystemTestCase.driver
+  end
+
+  def test_default_settings
+    assert_equal 'Capybara', Rails::SystemTestCase.driver.useragent
+  end
+
+  def test_setting_useragent
+    Rails::SystemTestCase.driver = SystemTesting::DriverAdapters::CapybaraRackTestDriver.new(
+      useragent: 'x'
+    )
+    assert_equal 'x', Rails::SystemTestCase.driver.useragent
+  end
+
+  def test_does_not_accept_nonsense_kwargs
+    assert_raises ArgumentError do
+      Rails::SystemTestCase.driver = SystemTesting::DriverAdapters::CapybaraRackTestDriver.new(
+        made_up_arg: 'x'
+      )
+    end
+  end
+end
diff --git a/actionpack/test/system_testing/capybara_selenium_driver_test.rb b/actionpack/test/system_testing/capybara_selenium_driver_test.rb
new file mode 100644
index 0000000000..6357b35aa6
--- /dev/null
+++ b/actionpack/test/system_testing/capybara_selenium_driver_test.rb
@@ -0,0 +1,58 @@
+require 'abstract_unit'
+
+class CapybaraSeleniumDriverTest < ActiveSupport::TestCase
+  def setup
+    Rails::SystemTestCase.driver = :capybara_selenium_driver
+  end
+
+  def test_setting_driver_adapter_to_selenium
+    assert_kind_of SystemTesting::DriverAdapters::CapybaraSeleniumDriver, Rails::SystemTestCase.driver
+  end
+
+  def test_default_settings
+    assert_equal :chrome, Rails::SystemTestCase.driver.browser
+    assert_equal :puma, Rails::SystemTestCase.driver.server
+    assert_equal 28100, Rails::SystemTestCase.driver.port
+    assert_equal [1400,1400], Rails::SystemTestCase.driver.screen_size
+  end
+
+  def test_setting_browser
+    Rails::SystemTestCase.driver = SystemTesting::DriverAdapters::CapybaraSeleniumDriver.new(
+      browser: :firefox
+    )
+
+    assert_equal :firefox, Rails::SystemTestCase.driver.browser
+  end
+
+  def test_setting_server
+    Rails::SystemTestCase.driver = SystemTesting::DriverAdapters::CapybaraSeleniumDriver.new(
+      server: :webrick
+    )
+
+    assert_equal :webrick, Rails::SystemTestCase.driver.server
+  end
+
+  def test_setting_port
+    Rails::SystemTestCase.driver = SystemTesting::DriverAdapters::CapybaraSeleniumDriver.new(
+      port: 3000
+    )
+
+    assert_equal 3000, Rails::SystemTestCase.driver.port
+  end
+
+  def test_setting_screen_size
+    Rails::SystemTestCase.driver = SystemTesting::DriverAdapters::CapybaraSeleniumDriver.new(
+      screen_size: [ 800, 800 ]
+    )
+
+    assert_equal [ 800, 800 ], Rails::SystemTestCase.driver.screen_size
+  end
+
+  def test_does_not_accept_nonsense_kwargs
+    assert_raises ArgumentError do
+      Rails::SystemTestCase.driver = SystemTesting::DriverAdapters::CapybaraSeleniumDriver.new(
+        made_up_arg: 'x'
+      )
+    end
+  end
+end
diff --git a/actionpack/test/system_testing/driver_adapter_test.rb b/actionpack/test/system_testing/driver_adapter_test.rb
new file mode 100644
index 0000000000..bfbeaa63a2
--- /dev/null
+++ b/actionpack/test/system_testing/driver_adapter_test.rb
@@ -0,0 +1,19 @@
+require 'abstract_unit'
+
+class DriverAdapterTest < ActiveSupport::TestCase
+  test 'only registered adapters are accepted' do
+    assert_raises(NameError) do
+      Rails::SystemTestCase.driver = :whatever
+    end
+
+    assert_nothing_raised do
+      Rails::SystemTestCase.driver = :capybara_selenium_driver
+    end
+  end
+
+  test 'settings can only be used for the appropriate adapter' do
+    assert_raises(ArgumentError) do
+      Rails::SystemTestCase.driver = SystemTesting::DriverAdapters::CapybaraRackTestDriver.new(something: 'test')
+    end
+  end
+end