Fix output of 'rails runner --help' [#4249 state:open]

railties/lib/rails/commands/runner.rb

@@ -23,7 +23,7 @@
     opts.separator ""
     opts.separator "You can also use runner as a shebang line for your scripts like this:"
     opts.separator "-------------------------------------------------------------"
-    opts.separator "#!/usr/bin/env #{File.expand_path($0)}"
+    opts.separator "#!/usr/bin/env #{File.expand_path($0)} runner"
     opts.separator ""
     opts.separator "Product.find(:all).each { |p| p.price *= 2 ; p.save! }"
     opts.separator "-------------------------------------------------------------"

railties/test/application/runner_test.rb

@@ -18,6 +18,11 @@ def self.count
       MODEL
     end
 
+    def test_should_include_runner_in_shebang_line_in_help
+      # redirect stderr to stdout as backticks don't capture stderr
+      assert_match "/rails runner", Dir.chdir(app_path) { `bundle exec rails runner --help 2>&1` }
+    end
+
     def test_should_run_ruby_statement
       assert_match "42", Dir.chdir(app_path) { `bundle exec rails runner "puts User.count"` }
     end