Skip a json.c test unless functions being tested exist

* test/src/json-tests.el
(json-parse-with-custom-null-and-false-objects): Skip this test
unless functions being tested exist.

1 files changed, 2 insertions, 0 deletions

diff --git a/test/src/json-tests.el b/test/src/json-tests.el
index ffa6fe19f9b..8bd679b886e 100644
--- a/test/src/json-tests.el
+++ b/test/src/json-tests.el
@@ -210,6 +210,8 @@ Test with both unibyte and multibyte strings."
     (should (looking-at-p (rx " [456]" eos)))))
 
 (ert-deftest json-parse-with-custom-null-and-false-objects ()
+  (skip-unless (and (fboundp 'json-serialize)
+                    (fboundp 'json-parse-string)))
   (let* ((input
           "{ \"abc\" : [9, false] , \"def\" : null }")
          (output