chore(ext/ffi): Use queueMicrotask in tests (#17954)

2 files changed, 3 insertions, 3 deletions

diff --git a/test_ffi/tests/event_loop_integration.ts b/test_ffi/tests/event_loop_integration.ts
index 28152dabf..55dc563bb 100644
--- a/test_ffi/tests/event_loop_integration.ts
+++ b/test_ffi/tests/event_loop_integration.ts
@@ -29,7 +29,7 @@ const dylib = Deno.dlopen(
 let retry = false;
 const tripleLogCallback = () => {
   console.log("Sync");
-  Promise.resolve().then(() => {
+  queueMicrotask(() => {
     console.log("Async");
     callback.unref();
   });
@@ -66,7 +66,7 @@ console.log("STORED_FUNCTION called");
 // Wait to make sure synch logging and async logging
 await new Promise((res) => setTimeout(res, 100));
 
-// Ref once to make sure both `Promise.resolve().then()` and `setTimeout()`
+// Ref once to make sure both `queueMicrotask()` and `setTimeout()`
 // must resolve and unref before isolate exists.
 // One ref'ing has been done by `threadSafe` constructor.
 callback.ref();
diff --git a/test_ffi/tests/thread_safe_test.js b/test_ffi/tests/thread_safe_test.js
index c5e9c74b7..237a8d713 100644
--- a/test_ffi/tests/thread_safe_test.js
+++ b/test_ffi/tests/thread_safe_test.js
@@ -82,7 +82,7 @@ const cleanupCallback = new Deno.UnsafeCallback(
   { parameters: [], result: "void" },
   () => {
     console.log("Callback being called");
-    Promise.resolve().then(() => cleanup());
+    queueMicrotask(() => cleanup());
   },
 );