Created rake restart task.

Fixes #18876. Rake restart touches `tmp/restart.txt` to restart
application on next request. Updated tests and documentation
accordingly.

1 files changed, 31 insertions, 0 deletions

diff --git a/railties/test/application/rake/restart_test.rb b/railties/test/application/rake/restart_test.rb
new file mode 100644
index 0000000000..35099913fb
--- /dev/null
+++ b/railties/test/application/rake/restart_test.rb
@@ -0,0 +1,31 @@
+require "isolation/abstract_unit"
+
+module ApplicationTests
+  module RakeTests
+    class RakeRestartTest < ActiveSupport::TestCase
+      include ActiveSupport::Testing::Isolation
+
+      def setup
+        build_app
+        boot_rails
+      end
+
+      def teardown
+        teardown_app
+      end
+      
+      test 'rake restart touches tmp/restart.txt' do
+        Dir.chdir(app_path) do
+          `rake restart`
+          assert File.exist?("tmp/restart.txt")
+          
+          prev_mtime = File.mtime("tmp/restart.txt")
+          sleep(1)
+          `rake restart`
+          curr_mtime = File.mtime("tmp/restart.txt")
+          assert_not_equal prev_mtime, curr_mtime
+        end
+      end
+    end
+  end
+end