test_dln.rb: fix constants

* test/-ext-/win32/test_dln.rb (test_check_imported): use toplevel
  constants explicitly to get rid of constants under the scope.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56245 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/-ext-/win32/test_dln.rb

@@ -8,19 +8,19 @@ module Bug
     class TestDln < Test::Unit::TestCase
       def test_check_imported
         bug = '[Bug #6303]'
-        so = File.expand_path("../ext/-test-/win32/dln/dlntest.dll", EnvUtil.rubybin)
-        assert_send([File, :file?, so])
-        path = ENV['PATH']
-        path = File.dirname(so) + RbConfig::CONFIG["PATH_SEPARATOR"] + path
+        so = ::File.expand_path("../ext/-test-/win32/dln/dlntest.dll", ::EnvUtil.rubybin)
+        assert_send([::File, :file?, so])
+        path = ::ENV['PATH']
+        path = ::File.dirname(so) + ::RbConfig::CONFIG["PATH_SEPARATOR"] + path
         assert_in_out_err([{'PATH'=>path}, '-r-test-/win32/dln', '-eexit'], '', [], [], bug, timeout: 10)
       end
 
       def test_nonascii_load
         bug9699 = '[ruby-core:61845] [Bug #9699]'
-        so = "-test-/dln/empty." + RbConfig::CONFIG["DLEXT"]
+        so = "-test-/dln/empty." + ::RbConfig::CONFIG["DLEXT"]
         so = $:.find {|d| d = ::File.join(d, so); break d if ::File.exist?(d)}
         assert_not_nil(so)
-        Dir.mkdir(dir = ::File.join(testdir = Dir.mktmpdir("test"), "\u{30c6 30b9 30c8}"))
+        ::Dir.mkdir(dir = ::File.join(testdir = ::Dir.mktmpdir("test"), "\u{30c6 30b9 30c8}"))
         ::File.copy_stream(so, ::File.join(dir, ::File.basename(so)))
         assert_separately(['-', bug9699, testdir, ::File.basename(so)], <<-'end;')
           bug, dir, so = *ARGV
@@ -30,8 +30,8 @@ module Bug
         end;
       ensure
         ::File.unlink(::File.join(dir, ::File.basename(so))) rescue nil
-        Dir.rmdir(dir) rescue nil
-        Dir.rmdir(testdir) rescue nil
+        ::Dir.rmdir(dir) rescue nil
+        ::Dir.rmdir(testdir) rescue nil
       end
 
     end