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-rw-r--r--tests/modules/string/test.lua2
1 files changed, 2 insertions, 0 deletions
diff --git a/tests/modules/string/test.lua b/tests/modules/string/test.lua
index 6bb3b6f78..94b3c1a04 100644
--- a/tests/modules/string/test.lua
+++ b/tests/modules/string/test.lua
@@ -112,4 +112,6 @@ function test_case(t)
t:are_equal(("Hello"):upper(), "HELLO")
t:are_equal(("Звезда Хэнсин"):lower(), "звезда хэнсин")
t:are_equal(("Звезда Хэнсин"):upper(), "ЗВЕЗДА ХЭНСИН")
+ t:are_equal(("Test 源文件🎆 Message"):lower(), "test 源文件🎆 message")
+ t:are_equal(("Test 源文件🎆 Message"):upper(), "TEST 源文件🎆 MESSAGE")
end