increase default timeout to prevent test failures

--- a/tests/config/setup.js
+++ b/tests/config/setup.js
@@ -5,3 +5,6 @@ Object.defineProperty(global, "run_spec", {
     return require("./format-test.js");
   },
 });
+
+// increase default timeout of 5000 ms
+jest.setTimeout(30000);