1 files changed, 9 insertions, 0 deletions
diff --git a/cli/tests/unit/performance_test.ts b/cli/tests/unit/performance_test.ts
index 252a31fc4..917546e2c 100644
--- a/cli/tests/unit/performance_test.ts
+++ b/cli/tests/unit/performance_test.ts
@@ -27,6 +27,15 @@ Deno.test(function timeOrigin() {
   assert(Date.now() >= origin);
 });
 
+Deno.test(function performanceToJSON() {
+  const json = performance.toJSON();
+
+  assert("timeOrigin" in json);
+  assert(json.timeOrigin === performance.timeOrigin);
+  // check there are no other keys
+  assertEquals(Object.keys(json).length, 1);
+});
+
 Deno.test(function performanceMark() {
   const mark = performance.mark("test");
   assert(mark instanceof PerformanceMark);