diff --git a/test/unit/response.cpp b/test/unit/response.cpp
index 141e3d99..c658ef80 100644
--- a/test/unit/response.cpp
+++ b/test/unit/response.cpp
@@ -273,6 +273,23 @@ class response_test
                 res.set_start_line(199, "Huh", version::http_1_1);
                 check(res, status::unknown, 199, "Huh", version::http_1_1);
             }
+            {
+                response res;
+                res.set_start_line(199, "Huh", version::http_1_1);
+                check(res, status::unknown, 199, "Huh", version::http_1_1);
+
+                res.set_start_line(199, "Huh", version::http_1_1);
+                check(res, status::unknown, 199, "Huh", version::http_1_1);
+
+                res.set_start_line(199, "ab", version::http_1_1);
+                check(res, status::unknown, 199, "ab", version::http_1_1);
+
+                res.set_start_line(199, "a", version::http_1_1);
+                check(res, status::unknown, 199, "a", version::http_1_1);
+
+                res.set_start_line(199, "abcdefghijklmnopqrstuvwxyz", version::http_1_1);
+                check(res, status::unknown, 199, "abcdefghijklmnopqrstuvwxyz", version::http_1_1);
+            }
             {
                 core::string_view s =
                     "HTTP/1.1 200 OK\r\n"