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-rw-r--r--test/ruby/test_string.rb4
1 files changed, 4 insertions, 0 deletions
diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index 4e55198a15..a0fb80f46e 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -2181,6 +2181,10 @@ class TestString < Test::Unit::TestCase
assert_equal(u("\x81\x82"), "\u3042".byteslice(1..2))
assert_equal(u("\x82")+("\u3042"*9), ("\u3042"*10).byteslice(2, 28))
+
+ bug7954 = '[ruby-dev:47108]'
+ assert_equal(false, "\u3042".byteslice(0, 2).valid_encoding?)
+ assert_equal(false, ("\u3042"*10).byteslice(0, 20).valid_encoding?)
end
end