fixes app_rails_loader_test.rb in Mac OS X

railties/test/app_rails_loader_test.rb

@@ -1,3 +1,4 @@
+require 'tmpdir'
 require 'pathname'
 require 'abstract_unit'
 require 'rails/app_rails_loader'
@@ -12,6 +13,10 @@ def expects_exec(exe)
     Rails::AppRailsLoader.expects(:exec).with(Rails::AppRailsLoader::RUBY, exe)
   end
 
+  def realpath(filename)
+    Pathname.new(filename).realpath
+  end
+
   setup do
     @tmp = Dir.mktmpdir('railties-rails-loader-test-suite')
     @cwd = Dir.pwd
@@ -50,7 +55,13 @@ def expects_exec(exe)
 
         expects_exec exe
         Rails::AppRailsLoader.exec_app_rails
-        assert_equal File.join(@tmp, 'foo'), Dir.pwd
+
+        # Compare the realpath in case either of them has symlinks.
+        #
+        # This happens in particular in Mac OS X, where @tmp starts
+        # with "/var", and Dir.pwd with "/private/var", due to a
+        # default system symlink var -> private/var.
+        assert_equal realpath("#@tmp/foo"), realpath(Dir.pwd)
       end
     end
   end