[bun:test] Implement `done` callback with support for async functions

1 files changed, 38 insertions, 0 deletions

diff --git a/test/bun.js/event-emitter.test.ts b/test/bun.js/event-emitter.test.ts
index 4c8d70452..952805cf8 100644
--- a/test/bun.js/event-emitter.test.ts
+++ b/test/bun.js/event-emitter.test.ts
@@ -13,4 +13,42 @@ describe("EventEmitter", () => {
     emitter.setMaxListeners(100);
     expect(emitter.getMaxListeners()).toBe(100);
   });
+
+  // These are also tests for the done() function in the test runner.
+  test("EventEmitter emit (different tick)", (done) => {
+    var emitter = new EventEmitter();
+    emitter.on("wow", () => done());
+    queueMicrotask(() => {
+      emitter.emit("wow");
+    });
+  });
+
+  // Unlike Jest, bun supports async and done
+  test("async EventEmitter emit (microtask)", async (done) => {
+    await 1;
+    var emitter = new EventEmitter();
+    emitter.on("wow", () => done());
+    emitter.emit("wow");
+  });
+
+  test("async EventEmitter emit (microtask) after", async (done) => {
+    var emitter = new EventEmitter();
+    emitter.on("wow", () => done());
+    await 1;
+    emitter.emit("wow");
+  });
+
+  test("EventEmitter emit (same tick)", (done) => {
+    var emitter = new EventEmitter();
+
+    emitter.on("wow", () => done());
+
+    emitter.emit("wow");
+  });
+
+  test("EventEmitter emit (setTimeout task)", (done) => {
+    var emitter = new EventEmitter();
+    emitter.on("wow", () => done());
+    setTimeout(() => emitter.emit("wow"), 1);
+  });
 });