1 files changed, 76 insertions, 0 deletions
diff --git a/integration/bunjs-only-snippets/microtask.js b/integration/bunjs-only-snippets/microtask.js
new file mode 100644
index 000000000..c5acfd578
--- /dev/null
+++ b/integration/bunjs-only-snippets/microtask.js
@@ -0,0 +1,76 @@
+// You can verify this test is correct by copy pasting this into a browser's console and checking it doesn't throw an error.
+var run = 0;
+
+await new Promise((resolve, reject) => {
+  queueMicrotask(() => {
+    if (run++ != 0) {
+      reject(new Error("Microtask execution order is wrong: " + run));
+    }
+    queueMicrotask(() => {
+      if (run++ != 3) {
+        reject(new Error("Microtask execution order is wrong: " + run));
+      }
+    });
+  });
+  queueMicrotask(() => {
+    if (run++ != 1) {
+      reject(new Error("Microtask execution order is wrong: " + run));
+    }
+    queueMicrotask(() => {
+      if (run++ != 4) {
+        reject(new Error("Microtask execution order is wrong: " + run));
+      }
+
+      queueMicrotask(() => {
+        if (run++ != 6) {
+          reject(new Error("Microtask execution order is wrong: " + run));
+        }
+      });
+    });
+  });
+  queueMicrotask(() => {
+    if (run++ != 2) {
+      reject(new Error("Microtask execution order is wrong: " + run));
+    }
+    queueMicrotask(() => {
+      if (run++ != 5) {
+        reject(new Error("Microtask execution order is wrong: " + run));
+      }
+
+      queueMicrotask(() => {
+        if (run++ != 7) {
+          reject(new Error("Microtask execution order is wrong: " + run));
+        }
+        resolve(true);
+      });
+    });
+  });
+});
+
+{
+  var passed = false;
+  try {
+    queueMicrotask(1234);
+  } catch (exception) {
+    passed = exception instanceof TypeError;
+  }
+
+  if (!passed)
+    throw new Error(
+      "queueMicrotask should throw a TypeError if the argument is not a function"
+    );
+}
+
+{
+  var passed = false;
+  try {
+    queueMicrotask();
+  } catch (exception) {
+    passed = exception instanceof TypeError;
+  }
+
+  if (!passed)
+    throw new Error(
+      "queueMicrotask should throw a TypeError if the argument is empty"
+    );
+}