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-rw-r--r--test/ruby/test_m17n_comb.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/ruby/test_m17n_comb.rb b/test/ruby/test_m17n_comb.rb
index 054287e2b5..99c162a92f 100644
--- a/test/ruby/test_m17n_comb.rb
+++ b/test/ruby/test_m17n_comb.rb
@@ -808,7 +808,7 @@ class TestM17NComb < Test::Unit::TestCase
def test_str_downcase
STRINGS.each {|s|
if !s.valid_encoding?
- assert_raise(ArgumentError) { s.downcase }
+ assert_raise(ArgumentError, "Offending string: #{s.inspect}, encoding: #{s.encoding}") { s.downcase }
next
end
t = s.downcase