From 25bd6868e5af9f30656dabeff9683b256e0a9370 Mon Sep 17 00:00:00 2001
From: crowlKats <13135287+crowlKats@users.noreply.github.com>
Date: Mon, 13 Apr 2020 18:34:32 +0200
Subject: feat(worker): add MessageEvent, ErrorEvent and handling to Worker API
 (#4391)
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Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>
---
 cli/tests/workers_test.ts | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

(limited to 'cli/tests/workers_test.ts')

diff --git a/cli/tests/workers_test.ts b/cli/tests/workers_test.ts
index 2c56a491c..bb00d67fd 100644
--- a/cli/tests/workers_test.ts
+++ b/cli/tests/workers_test.ts
@@ -184,3 +184,50 @@ Deno.test({
     await promise;
   },
 });
+
+Deno.test({
+  name: "worker is event listener",
+  fn: async function (): Promise<void> {
+    let messageHandlersCalled = 0;
+    let errorHandlersCalled = 0;
+
+    const promise1 = createResolvable();
+    const promise2 = createResolvable();
+
+    const worker = new Worker("../tests/subdir/event_worker.js", {
+      type: "module",
+    });
+
+    worker.onmessage = (_e: Event): void => {
+      messageHandlersCalled++;
+    };
+    worker.addEventListener("message", (_e: Event) => {
+      messageHandlersCalled++;
+    });
+    worker.addEventListener("message", (_e: Event) => {
+      messageHandlersCalled++;
+      promise1.resolve();
+    });
+
+    worker.onerror = (e): void => {
+      errorHandlersCalled++;
+      e.preventDefault();
+    };
+    worker.addEventListener("error", (_e: Event) => {
+      errorHandlersCalled++;
+    });
+    worker.addEventListener("error", (_e: Event) => {
+      errorHandlersCalled++;
+      promise2.resolve();
+    });
+
+    worker.postMessage("ping");
+    await promise1;
+    assertEquals(messageHandlersCalled, 3);
+
+    worker.postMessage("boom");
+    await promise2;
+    assertEquals(errorHandlersCalled, 3);
+    worker.terminate();
+  },
+});
-- 
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