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-rw-r--r--test/ruby/test_string.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index c3fd2b7d94..1f21619798 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -2750,6 +2750,8 @@ CODE
assert_not_equal(str.object_id, (+str).object_id)
assert_equal(str.object_id, (-str).object_id)
bar = %w(b a r).join('')
+ assert_not_predicate bar, :tainted?
+ assert_not_predicate str, :tainted?
assert_same(str, -bar, "uminus deduplicates [Feature #13077]")
end