1 files changed, 27 insertions, 0 deletions
diff --git a/cli/tests/unit/performance_test.ts b/cli/tests/unit/performance_test.ts
index 156841165..94af0731c 100644
--- a/cli/tests/unit/performance_test.ts
+++ b/cli/tests/unit/performance_test.ts
@@ -2,6 +2,7 @@
 import {
   assert,
   assertEquals,
+  assertStringIncludes,
   assertThrows,
   deferred,
   unitTest,
@@ -81,6 +82,32 @@ unitTest(function performanceMeasure() {
   });
 });
 
+unitTest(function performanceCustomInspectFunction(): void {
+  assertStringIncludes(Deno.inspect(performance), "Performance");
+  assertStringIncludes(
+    Deno.inspect(Performance.prototype),
+    "Performance",
+  );
+});
+
+unitTest(function performanceMarkCustomInspectFunction(): void {
+  const mark1 = performance.mark("mark1");
+  assertStringIncludes(Deno.inspect(mark1), "PerformanceMark");
+  assertStringIncludes(
+    Deno.inspect(PerformanceMark.prototype),
+    "PerformanceMark",
+  );
+});
+
+unitTest(function performanceMeasureCustomInspectFunction(): void {
+  const measure1 = performance.measure("measure1");
+  assertStringIncludes(Deno.inspect(measure1), "PerformanceMeasure");
+  assertStringIncludes(
+    Deno.inspect(PerformanceMeasure.prototype),
+    "PerformanceMeasure",
+  );
+});
+
 unitTest(function performanceIllegalConstructor() {
   assertThrows(() => new Performance(), TypeError, "Illegal constructor");
   assertEquals(Performance.length, 0);