1 files changed, 29 insertions, 0 deletions
diff --git a/test/js/bun/util/readablestreamtoarraybuffer.test.ts b/test/js/bun/util/readablestreamtoarraybuffer.test.ts
new file mode 100644
index 000000000..132e5f18a
--- /dev/null
+++ b/test/js/bun/util/readablestreamtoarraybuffer.test.ts
@@ -0,0 +1,29 @@
+import { test, expect } from "bun:test";
+
+test("readableStreamToArrayBuffer works", async () => {
+  // the test calls InternalPromise.then. this test ensures that such function is not user-overridable.
+  let _then = Promise.prototype.then;
+  let counter = 0;
+  // @ts-ignore
+  Promise.prototype.then = (...args) => {
+    counter++;
+    return _then.apply(this, args);
+  };
+  try {
+    const result = await Bun.readableStreamToArrayBuffer(
+      new ReadableStream({
+        async start(controller) {
+          controller.enqueue(new TextEncoder().encode("bun is"));
+          controller.enqueue(new TextEncoder().encode(" awesome!"));
+          controller.close();
+        },
+      }),
+    );
+    expect(counter).toBe(0);
+    expect(new TextDecoder().decode(result)).toBe("bun is awesome!");
+  } catch (error) {
+    throw error;
+  } finally {
+    Promise.prototype.then = _then;
+  }
+});