prefer __dir__ over __FILE__ in File.expand_path

Thinking .. relative to files is not natural, we are used
to think "parent of a directory", and we have __dir__
nowadays.

Author: fxn

actionmailer/bin/test

@@ -1,4 +1,6 @@
 #!/usr/bin/env ruby
-COMPONENT_ROOT = File.expand_path("../../", __FILE__)
+
+COMPONENT_ROOT = File.expand_path("..", __dir__)
 require File.expand_path("../tools/test", COMPONENT_ROOT)
+
 exit Minitest.run(ARGV)

actionpack/bin/test

@@ -1,4 +1,6 @@
 #!/usr/bin/env ruby
-COMPONENT_ROOT = File.expand_path("../../", __FILE__)
+
+COMPONENT_ROOT = File.expand_path("..", __dir__)
 require File.expand_path("../tools/test", COMPONENT_ROOT)
+
 exit Minitest.run(ARGV)

actionview/bin/test

@@ -1,4 +1,6 @@
 #!/usr/bin/env ruby
-COMPONENT_ROOT = File.expand_path("../../", __FILE__)
+
+COMPONENT_ROOT = File.expand_path("..", __dir__)
 require File.expand_path("../tools/test", COMPONENT_ROOT)
+
 exit Minitest.run(ARGV)

activemodel/bin/test

@@ -1,4 +1,6 @@
 #!/usr/bin/env ruby
-COMPONENT_ROOT = File.expand_path("../../", __FILE__)
+
+COMPONENT_ROOT = File.expand_path("..", __dir__)
 require File.expand_path("../tools/test", COMPONENT_ROOT)
+
 exit Minitest.run(ARGV)

activerecord/bin/test

@@ -1,6 +1,8 @@
 #!/usr/bin/env ruby
-COMPONENT_ROOT = File.expand_path("../../", __FILE__)
+
+COMPONENT_ROOT = File.expand_path("..", __dir__)
 require File.expand_path("../tools/test", COMPONENT_ROOT)
+
 module Minitest
   def self.plugin_active_record_options(opts, options)
     opts.separator ""

activesupport/bin/test

@@ -1,4 +1,6 @@
 #!/usr/bin/env ruby
-COMPONENT_ROOT = File.expand_path("../../", __FILE__)
+
+COMPONENT_ROOT = File.expand_path("..", __dir__)
 require File.expand_path("../tools/test", COMPONENT_ROOT)
+
 exit Minitest.run(ARGV)