test: update FileAPI web-platform tests

PR-URL: nodejs#48322
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: anonrig

test/fixtures/wpt/FileAPI/reading-data-section/filereader_readAsDataURL.any.js

@@ -39,4 +39,16 @@ async_test(function(testCase) {
     testCase.done();
   });
   reader.readAsDataURL(blob);
-}, 'readAsDataURL result for Blob with unspecified MIME type');
+}, 'readAsDataURL result for Blob with unspecified MIME type');
+
+async_test(function(testCase) {
+  var blob = new Blob([]);
+  var reader = new FileReader();
+
+  reader.onload = this.step_func(function() {
+    assert_equals(reader.result,
+                  "data:application/octet-stream;base64,");
+    testCase.done();
+  });
+  reader.readAsDataURL(blob);
+}, 'readAsDataURL result for empty Blob');

test/fixtures/wpt/README.md

@@ -16,7 +16,7 @@ Last update:
 - dom/events: https://github.com/web-platform-tests/wpt/tree/ab8999891c/dom/events
 - encoding: https://github.com/web-platform-tests/wpt/tree/0c1b9d1622/encoding
 - fetch/data-urls/resources: https://github.com/web-platform-tests/wpt/tree/7c79d998ff/fetch/data-urls/resources
-- FileAPI: https://github.com/web-platform-tests/wpt/tree/1e432c4550/FileAPI
+- FileAPI: https://github.com/web-platform-tests/wpt/tree/e36dbb6f00/FileAPI
 - hr-time: https://github.com/web-platform-tests/wpt/tree/34cafd797e/hr-time
 - html/webappapis/atob: https://github.com/web-platform-tests/wpt/tree/f267e1dca6/html/webappapis/atob
 - html/webappapis/microtask-queuing: https://github.com/web-platform-tests/wpt/tree/2c5c3c4c27/html/webappapis/microtask-queuing

test/fixtures/wpt/versions.json

@@ -24,7 +24,7 @@
     "path": "fetch/data-urls/resources"
   },
   "FileAPI": {
-    "commit": "1e432c4550a1595888d7c9eb26d90895e9e7e022",
+    "commit": "e36dbb6f00fb59f9fc792f509194432e9e6d0b6d",
     "path": "FileAPI"
   },
   "hr-time": {