--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/diagnostic-format-json-1.c	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,25 @@
+/* { dg-do compile } */
+/* { dg-options "-fdiagnostics-format=json" } */
+
+#error message
+
+/* Use dg-regexp to consume the JSON output starting with
+   the innermost values, and working outwards.
+   We can't rely on any ordering of the keys.  */
+
+/* { dg-regexp "\"kind\": \"error\"" } */
+/* { dg-regexp "\"message\": \"#error message\"" } */
+
+/* { dg-regexp "\"caret\": \{" } */
+/* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-1.c\"" } */
+/* { dg-regexp "\"line\": 4" } */
+/* { dg-regexp "\"column\": 2" } */
+
+/* { dg-regexp "\"finish\": \{" } */
+/* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-1.c\"" } */
+/* { dg-regexp "\"line\": 4" } */
+/* { dg-regexp "\"column\": 6" } */
+
+/* { dg-regexp "\"locations\": \[\[\{\}, \]*\]" } */
+/* { dg-regexp "\"children\": \[\[\]\[\]\]" } */
+/* { dg-regexp "\[\[\{\}, \]*\]" } */