1 files changed, 32 insertions, 0 deletions
diff --git a/dom/base/test/browser_bug1307747.js b/dom/base/test/browser_bug1307747.js
new file mode 100644
index 0000000000..8d1448cc23
--- /dev/null
+++ b/dom/base/test/browser_bug1307747.js
@@ -0,0 +1,32 @@
+/* -*- Mode: javascript; tab-width: 2; indent-tabs-mode: nil; js-indent-level: 2 -*- */
+
+var {Promise: promise} = Cu.import("resource://gre/modules/Promise.jsm", {});
+
+const BASE_URI = "http://mochi.test:8888/browser/dom/base/test/empty.html";
+
+add_task(function* test_initialize() {
+  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, BASE_URI);
+  let browser = gBrowser.getBrowserForTab(tab);
+
+  let blob = yield ContentTask.spawn(browser, null, function() {
+    let blob = new Blob([new Array(1024*1024).join('123456789ABCDEF')]);
+    return blob;
+  });
+
+  ok(blob, "We have a blob!");
+  is(blob.size, new Array(1024*1024).join('123456789ABCDEF').length, "The size matches");
+
+  let status = yield ContentTask.spawn(browser, blob, function(blob) {
+    return new Promise(resolve => {
+      let fr = new content.FileReader();
+      fr.readAsText(blob);
+      fr.onloadend = function() {
+        resolve(fr.result == new Array(1024*1024).join('123456789ABCDEF'));
+      }
+    });
+  });
+
+  ok(status, "Data match!");
+
+  yield BrowserTestUtils.removeTab(tab);
+});