1 files changed, 4 insertions, 0 deletions
diff --git a/absl/strings/ascii_test.cc b/absl/strings/ascii_test.cc
index 5ecd23f8..83af7825 100644
--- a/absl/strings/ascii_test.cc
+++ b/absl/strings/ascii_test.cc
@@ -197,11 +197,15 @@ TEST(AsciiStrTo, Lower) {
   const std::string str("GHIJKL");
   const std::string str2("MNOPQR");
   const absl::string_view sp(str2);
+  std::string mutable_str("STUVWX");
 
   EXPECT_EQ("abcdef", absl::AsciiStrToLower(buf));
   EXPECT_EQ("ghijkl", absl::AsciiStrToLower(str));
   EXPECT_EQ("mnopqr", absl::AsciiStrToLower(sp));
 
+  absl::AsciiStrToLower(&mutable_str);
+  EXPECT_EQ("stuvwx", mutable_str);
+
   char mutable_buf[] = "Mutable";
   std::transform(mutable_buf, mutable_buf + strlen(mutable_buf),
                  mutable_buf, absl::ascii_tolower);