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-rw-r--r--test/ruby/test_encoding.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/test/ruby/test_encoding.rb b/test/ruby/test_encoding.rb
index d571dd28c1..80bed39936 100644
--- a/test/ruby/test_encoding.rb
+++ b/test/ruby/test_encoding.rb
@@ -74,6 +74,8 @@ class TestEncoding < Test::Unit::TestCase
e = Encoding.list.last
format = "%d".force_encoding(e)
assert_equal("0", format % 0)
+ assert_equal(e, format.dup.encoding)
+ assert_equal(e, (format*1).encoding)
end;
end