From a55e689e389bf8a80639e31c217873d27b471a40 Mon Sep 17 00:00:00 2001
From: Benjamin Gruenbaum <benjamingr@gmail.com>
Date: Wed, 11 Nov 2020 17:59:49 +0200
Subject: fix(op_crates/web): FileReader event handler order (#8348)

---
 cli/tests/unit/filereader_test.ts | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'cli/tests/unit/filereader_test.ts')

diff --git a/cli/tests/unit/filereader_test.ts b/cli/tests/unit/filereader_test.ts
index e6fd1cab6..0f1f74d6b 100644
--- a/cli/tests/unit/filereader_test.ts
+++ b/cli/tests/unit/filereader_test.ts
@@ -218,3 +218,25 @@ unitTest(async function fileReaderLoadBlobAbort(): Promise<void> {
     fr.abort();
   });
 });
+
+unitTest(
+  async function fileReaderDispatchesEventsInCorrectOrder(): Promise<void> {
+    await new Promise<void>((resolve) => {
+      const fr = new FileReader();
+      const b1 = new Blob(["Hello World"]);
+      let out = "";
+      fr.addEventListener("loadend", () => {
+        out += "1";
+      });
+      fr.onloadend = (ev): void => {
+        out += "2";
+      };
+      fr.addEventListener("loadend", () => {
+        assertEquals(out, "12");
+        resolve();
+      });
+
+      fr.readAsDataURL(b1);
+    });
+  },
+);
-- 
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