1 files changed, 17 insertions, 0 deletions
diff --git a/test/test_tmpdir.rb b/test/test_tmpdir.rb
index 07c7ddc736..202098cefa 100644
--- a/test/test_tmpdir.rb
+++ b/test/test_tmpdir.rb
@@ -58,4 +58,21 @@ class TestTmpdir < Test::Unit::TestCase
       assert_kind_of(String, d)
     }
   end
+
+  TRAVERSAL_PATH = Array.new(Dir.pwd.split('/').count, '..').join('/') + Dir.pwd + '/'
+  TRAVERSAL_PATH.delete!(':') if /mswin|mingw/ =~ RUBY_PLATFORM
+
+  def test_mktmpdir_traversal
+    expect = Dir.glob(TRAVERSAL_PATH + '*').count
+    Dir.mktmpdir(TRAVERSAL_PATH + 'foo')
+    actual = Dir.glob(TRAVERSAL_PATH + '*').count
+    assert_equal expect, actual
+  end
+
+  def test_mktmpdir_traversal_array
+    expect = Dir.glob(TRAVERSAL_PATH + '*').count
+    Dir.mktmpdir([TRAVERSAL_PATH, 'foo'])
+    actual = Dir.glob(TRAVERSAL_PATH + '*').count
+    assert_equal expect, actual
+  end
 end