Move and rename system tests

* Move system tests back into Action Pack
* Rename `ActionSystemTest` to `ActionDispatch::SystemTestCase`
* Remove private base module and only make file for public
`SystemTestCase` class, name private module `SystemTesting`
* Rename `ActionSystemTestCase` to `ApplicationSystemTestCase`
* Update corresponding documentation and guides
* Delete old `ActionSystemTest` files

5 files changed, 60 insertions, 0 deletions

diff --git a/actionpack/test/dispatch/system_testing/browser_test.rb b/actionpack/test/dispatch/system_testing/browser_test.rb
new file mode 100644
index 0000000000..b0ad309492
--- /dev/null
+++ b/actionpack/test/dispatch/system_testing/browser_test.rb
@@ -0,0 +1,10 @@
+require "abstract_unit"
+require "action_dispatch/system_testing/browser"
+
+class BrowserTest < ActiveSupport::TestCase
+  test "initializing the browser" do
+    browser = ActionDispatch::SystemTesting::Browser.new(:chrome, [ 1400, 1400 ])
+    assert_equal :chrome, browser.instance_variable_get(:@name)
+    assert_equal [ 1400, 1400 ], browser.instance_variable_get(:@screen_size)
+  end
+end
diff --git a/actionpack/test/dispatch/system_testing/driver_test.rb b/actionpack/test/dispatch/system_testing/driver_test.rb
new file mode 100644
index 0000000000..f0ebdb38db
--- /dev/null
+++ b/actionpack/test/dispatch/system_testing/driver_test.rb
@@ -0,0 +1,9 @@
+require "abstract_unit"
+require "action_dispatch/system_testing/driver"
+
+class DriverTest < ActiveSupport::TestCase
+  test "initializing the driver" do
+    driver = ActionDispatch::SystemTesting::Driver.new(:selenium)
+    assert_equal :selenium, driver.instance_variable_get(:@name)
+  end
+end
diff --git a/actionpack/test/dispatch/system_testing/screenshot_helper_test.rb b/actionpack/test/dispatch/system_testing/screenshot_helper_test.rb
new file mode 100644
index 0000000000..3da89f4a10
--- /dev/null
+++ b/actionpack/test/dispatch/system_testing/screenshot_helper_test.rb
@@ -0,0 +1,10 @@
+require "abstract_unit"
+require "action_dispatch/system_testing/test_helpers/screenshot_helper"
+
+class ScreenshotHelperTest < ActiveSupport::TestCase
+  test "image path is saved in tmp directory" do
+    new_test = ActionDispatch::SystemTestCase.new("x")
+
+    assert_equal "tmp/screenshots/failures_x.png", new_test.send(:image_path)
+  end
+end
diff --git a/actionpack/test/dispatch/system_testing/server_test.rb b/actionpack/test/dispatch/system_testing/server_test.rb
new file mode 100644
index 0000000000..66842f4ea9
--- /dev/null
+++ b/actionpack/test/dispatch/system_testing/server_test.rb
@@ -0,0 +1,10 @@
+require "abstract_unit"
+require "capybara/dsl"
+require "action_dispatch/system_testing/server"
+
+class ServerTest < ActiveSupport::TestCase
+  test "initializing the server port" do
+    server = ActionDispatch::SystemTesting::Server.new.run
+    assert_includes Capybara.servers, :rails_puma
+  end
+end
diff --git a/actionpack/test/dispatch/system_testing/system_test_case_test.rb b/actionpack/test/dispatch/system_testing/system_test_case_test.rb
new file mode 100644
index 0000000000..a384902a14
--- /dev/null
+++ b/actionpack/test/dispatch/system_testing/system_test_case_test.rb
@@ -0,0 +1,21 @@
+require "abstract_unit"
+
+class SystemTestCaseTest < ActiveSupport::TestCase
+  test "driven_by sets Capybara's default driver to poltergeist" do
+    ActionDispatch::SystemTestCase.driven_by :poltergeist
+
+    assert_equal :poltergeist, Capybara.default_driver
+  end
+
+  test "driven_by sets Capybara's drivers respectively" do
+    ActionDispatch::SystemTestCase.driven_by :selenium, using: :chrome
+
+    assert_includes Capybara.drivers, :selenium
+    assert_includes Capybara.drivers, :chrome
+    assert_equal :chrome, Capybara.default_driver
+  end
+
+  test "selenium? returns false if driver is poltergeist" do
+    assert_not ActionDispatch::SystemTestCase.selenium?(:poltergeist)
+  end
+end