dom/workers/test/test_fileReaderSync_when_closing.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <head>
   4   <meta charset="utf-8">
   5   <title>Test for FileReaderSync when the worker is closing</title>
   6   <script src="/tests/SimpleTest/SimpleTest.js"></script>
   7   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
   8 </head>
   9 <body>
  10   <script type="application/javascript">
  11
  12 // In order to exercise FileReaderSync::SyncRead's syncLoop-using AsyncWait()
  13 // path, we need to provide a stream that will both 1) not have all the data
  14 // immediately available (eliminating memory-backed Blobs) and 2) return
  15 // NS_BASE_STREAM_WOULD_BLOCK.  Under e10s, any Blob/File sourced from the
  16 // parent process (as loadChromeScript performs) will be backed by an
  17 // RemoteLazyInputStream and will behave this way on first use (when it is in
  18 // the eInit state).  For ease of testing, we reuse script_createFile.js which
  19 // involves a file on disk, but a memory-backed Blob from the parent process
  20 // would be equally fine.  Under non-e10s, this File will not do the right
  21 // thing because a synchronous nsFileInputStream will be made directly
  22 // available and the AsyncWait path won't be taken, but the test will still
  23 // pass.
  24
  25 var url = SimpleTest.getTestFileURL("script_createFile.js");
  26 var script = SpecialPowers.loadChromeScript(url);
  27
  28 function onOpened(message) {
  29   function workerCode() {
  30     onmessage = function(e) {
  31       self.close();
  32       var fr = new FileReaderSync();
  33       self.postMessage(fr.readAsText(e.data));
  34     }
  35   }
  36
  37   var b = new Blob([workerCode+'workerCode();']);
  38   var w = new Worker(URL.createObjectURL(b));
  39   w.onmessage = function(e) {
  40     is(e.data, "Hello world!", "The blob content is OK!");
  41     SimpleTest.finish();
  42   }
  43
  44   w.postMessage(message.data);
  45 }
  46
  47 script.addMessageListener("nonEmptyFile.opened", onOpened);
  48 script.sendAsyncMessage("nonEmptyFile.open");
  49
  50 SimpleTest.waitForExplicitFinish();
  51
  52   </script>
  53 </body>
  54 </html>