diff --git a/Makefile b/Makefile
index 0f4c34c3..ad1295ea 100644
--- a/Makefile
+++ b/Makefile
@@ -82,7 +82,7 @@ test: unit_test
 
 coverage: test
 	gcov -l -n *.gcno | sed '/^$$/d' | sed 'N;s/\n/ /'
-	gcov mongoose.gcno >/dev/null
+	gcov -t mongoose.c > mongoose.gcov
 
 upload-coverage: coverage
 	curl -s https://codecov.io/bash | /bin/bash
diff --git a/test/unit_test.c b/test/unit_test.c
index ef436426..e3345e82 100644
--- a/test/unit_test.c
+++ b/test/unit_test.c
@@ -1709,7 +1709,12 @@ static void test_check_ip_acl(void) {
 static void w3(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
   // MG_INFO(("ev %d", ev));
   if (ev == MG_EV_WS_OPEN) {
+    char buf[8192];
+    memset(buf, 'A', sizeof(buf));
     mg_ws_send(c, "hi there!", 9, WEBSOCKET_OP_TEXT);
+    mg_printf(c, "%s", "boo");
+    mg_ws_wrap(c, 3, WEBSOCKET_OP_TEXT),
+        mg_ws_send(c, buf, sizeof(buf), WEBSOCKET_OP_TEXT);
   } else if (ev == MG_EV_WS_MSG) {
     struct mg_ws_message *wm = (struct mg_ws_message *) ev_data;
     ASSERT(mg_strcmp(wm->data, mg_str("lebowski")) == 0);
@@ -1742,7 +1747,13 @@ static void w2(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
     }
   } else if (ev == MG_EV_WS_MSG) {
     struct mg_ws_message *wm = (struct mg_ws_message *) ev_data;
-    ASSERT(mg_strcmp(wm->data, mg_str("hi there!")) == 0);
+    if (wm->data.len == 9) {
+      ASSERT(mg_strcmp(wm->data, mg_str("hi there!")) == 0);
+    } else if (wm->data.len == 3) {
+      ASSERT(mg_strcmp(wm->data, mg_str("boo")) == 0);
+    } else {
+      ASSERT(wm->data.len == 8192);
+    }
   }
 }