1 files changed, 13 insertions, 0 deletions
diff --git a/test/ruby/enc/test_utf16.rb b/test/ruby/enc/test_utf16.rb
index 30dbb2e88..c949c1e29 100644
--- a/test/ruby/enc/test_utf16.rb
+++ b/test/ruby/enc/test_utf16.rb
@@ -368,4 +368,17 @@ EOT
     r = Regexp.new(Regexp.escape(s))
     assert(r =~ s, "#{encdump(r)} =~ #{encdump(s)}")
   end
+
+  def test_casecmp
+    assert_equal(0, "\0A".force_encoding("UTF-16BE").casecmp("\0a".force_encoding("UTF-16BE")))
+    assert_not_equal(0, "\0A".force_encoding("UTF-16LE").casecmp("\0a".force_encoding("UTF-16LE")))
+    assert_not_equal(0, "A\0".force_encoding("UTF-16BE").casecmp("a\0".force_encoding("UTF-16BE")))
+    assert_equal(0, "A\0".force_encoding("UTF-16LE").casecmp("a\0".force_encoding("UTF-16LE")))
+
+    ary = ["01".force_encoding("UTF-16LE"),
+           "10".force_encoding("UTF-16LE")]
+    e = ary.sort {|x,y| x <=> y }
+    a = ary.sort {|x,y| x.casecmp(y) }
+    assert_equal(e, a)
+  end
 end