Fix testing guide [skip ci]

guides/source/testing.md

@@ -367,9 +367,10 @@ All the basic assertions such as `assert_equal` defined in `Minitest::Assertions
 * [`ActiveSupport::TestCase`](http://api.rubyonrails.org/classes/ActiveSupport/TestCase.html)
 * [`ActionMailer::TestCase`](http://api.rubyonrails.org/classes/ActionMailer/TestCase.html)
 * [`ActionView::TestCase`](http://api.rubyonrails.org/classes/ActionView/TestCase.html)
-* [`ActionDispatch::IntegrationTest`](http://api.rubyonrails.org/classes/ActionDispatch/IntegrationTest.html)
 * [`ActiveJob::TestCase`](http://api.rubyonrails.org/classes/ActiveJob/TestCase.html)
+* [`ActionDispatch::IntegrationTest`](http://api.rubyonrails.org/classes/ActionDispatch/IntegrationTest.html)
 * [`ActionDispatch::SystemTestCase`](http://api.rubyonrails.org/classes/ActionDispatch/SystemTestCase.html)
+* [`Rails::Generators::TestCase`](http://api.rubyonrails.org/classes/Rails/Generators/TestCase.html)
 
 Each of these classes include `Minitest::Assertions`, allowing us to use all of the basic assertions in our tests.
 
@@ -451,7 +452,8 @@ You can run multiple files and directories at the same time:
 By default test failures and errors are reported inline during a run.
 
 Rails options:
-    -e, --environment ENV            Run tests in the ENV environment
+    -w, --warnings                   Run with Ruby warnings enabled
+    -e, --environment                Run tests in the ENV environment
     -b, --backtrace                  Show the complete backtrace
     -d, --defer-output               Output test failures and errors after the test run
     -f, --fail-fast                  Abort test run on first failure or error