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-rw-r--r--test/ruby/test_string.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index f71dfc7fee..31b7abe31c 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -989,6 +989,9 @@ CODE
assert_equal ["a", "b", "c"], "abc".b.each_grapheme_cluster.to_a
s = ("x"+"\u{10ABCD}"*250000)
assert_empty(s.each_grapheme_cluster {s.clear})
+
+ assert_nil "\u{20 200d}".each_grapheme_cluster.size
+ assert_nil "\u{a 308}".each_grapheme_cluster.size
end
def test_grapheme_clusters