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-rw-r--r--lib/stdlib/test/string_SUITE.erl4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/stdlib/test/string_SUITE.erl b/lib/stdlib/test/string_SUITE.erl
index 4320b735ac..90f980c0e5 100644
--- a/lib/stdlib/test/string_SUITE.erl
+++ b/lib/stdlib/test/string_SUITE.erl
@@ -582,6 +582,8 @@ cd_gc(_) ->
[$e,778] = string:next_codepoint([$e,778]),
[$e|<<204,138>>] = string:next_codepoint(<<$e,778/utf8>>),
[778|_] = string:next_codepoint(tl(string:next_codepoint(<<$e,778/utf8>>))),
+ [0|<<128,1>>] = string:next_codepoint(<<0,128,1>>),
+ {error,<<128,1>>} = string:next_codepoint(<<128,1>>),
[] = string:next_grapheme(""),
[] = string:next_grapheme(<<>>),
@@ -589,6 +591,8 @@ cd_gc(_) ->
"abcd" = string:next_grapheme("abcd"),
[[$e,778]] = string:next_grapheme([$e,778]),
[[$e,778]] = string:next_grapheme(<<$e,778/utf8>>),
+ [0|<<128,1>>] = string:next_grapheme(<<0,128,1>>),
+ {error,<<128,1>>} = string:next_grapheme(<<128,1>>),
ok.