diff --git a/ChangeLog b/ChangeLog
index d65de11a69..61998df60b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+Mon Dec 23 18:37:16 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* test/fileutils/fileasserts.rb (assert_ownership_group): new
+	  assertion for group ownership.
+
+	* test/fileutils/test_fileutils.rb (test_chown{,_verbose,_noop}):
+	  based on the patch by vajrasky (Vajrasky Kok) at
+	  [ruby-core:59281].  [Feature #9286]
+
 Mon Dec 23 15:53:45 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* hash.c (HAS_EXTRA_STATES): warn extra states only when something
diff --git a/test/fileutils/fileasserts.rb b/test/fileutils/fileasserts.rb
index c60606ee7f..2cc7e2316b 100644
--- a/test/fileutils/fileasserts.rb
+++ b/test/fileutils/fileasserts.rb
@@ -86,6 +86,15 @@ EOT
 File modes expected to be equal:
  <#{'%0*o' % [width, mode1]}>: "#{file1}"
  <#{'%0*o' % [width, mode2]}>: "#{file2}"
+EOT
+      end
+
+      def assert_ownership_group(expected, file)
+        actual = File.stat(file).gid
+        assert expected == actual, <<EOT
+File group ownership of "#{file}" unexpected:
+ Expected: <#{expected}>
+   Actual: <#{actual}>
 EOT
       end
     end
diff --git a/test/fileutils/test_fileutils.rb b/test/fileutils/test_fileutils.rb
index c5f8734fea..a30d1ab94d 100644
--- a/test/fileutils/test_fileutils.rb
+++ b/test/fileutils/test_fileutils.rb
@@ -1,6 +1,7 @@
 # $Id$
 
 require 'fileutils'
+require 'etc'
 require_relative 'fileasserts'
 require 'pathname'
 require 'tmpdir'
@@ -111,6 +112,7 @@ class TestFileUtils
 
   def setup
     @prevdir = Dir.pwd
+    @groups = Process.groups
     tmproot = TMPROOT
     mymkdir tmproot unless File.directory?(tmproot)
     Dir.chdir tmproot
@@ -1052,11 +1054,53 @@ class TestFileUtils
     }
   end if have_file_perm?
 
-  # FIXME: How can I test this method?
   def test_chown
     check_singleton :chown
+
+    return unless @groups[1]
+
+    input_group_1 = @groups[0]
+    assert_output_lines([]) {
+      touch 'tmp/a'
+      # integer input for group, nil for user
+      chown nil, input_group_1, 'tmp/a'
+      assert_ownership_group @groups[0], 'tmp/a'
+    }
+
+    input_group_2 = Etc.getgrgid(@groups[1]).name
+    assert_output_lines([]) {
+      touch 'tmp/b'
+      # string input for group, -1 for user
+      chown -1, input_group_2, 'tmp/b'
+      assert_ownership_group @groups[1], 'tmp/b'
+    }
   end if have_file_perm?
 
+  def test_chown_verbose
+    assert_output_lines(["chown :#{@groups[0]} tmp/a1 tmp/a2"]) {
+      touch 'tmp/a1'
+      touch 'tmp/a2'
+      chown nil, @groups[0], ['tmp/a1', 'tmp/a2'], verbose: true
+      assert_ownership_group @groups[0], 'tmp/a1'
+      assert_ownership_group @groups[0], 'tmp/a2'
+    }
+  end if have_file_perm?
+
+  def test_chown_noop
+    return unless @groups[1]
+    assert_output_lines([]) {
+      touch 'tmp/a'
+      chown nil, @groups[0], 'tmp/a', :noop => false
+      assert_ownership_group @groups[0], 'tmp/a'
+      chown nil, @groups[1], 'tmp/a', :noop => true
+      assert_ownership_group @groups[0], 'tmp/a'
+      chown nil, @groups[1], 'tmp/a'
+      assert_ownership_group @groups[1], 'tmp/a'
+    }
+  end if have_file_perm?
+
+  # FIXME: Need to add test for chown with root account
+
   # FIXME: How can I test this method?
   def test_chown_R
     check_singleton :chown_R