The Tor Browser: toolkit/components/osfile/tests/xpcshell/test_osfile_async

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 "use strict";

     3 Components.utils.import("resource://gre/modules/osfile.jsm");

     4 Components.utils.import("resource://gre/modules/Task.jsm");

     6 function run_test() {

     7   do_test_pending();

     8   run_next_test();

9 }

    11 /**

    12  * Test to ensure that {bytes:} in options to |readTo| and |write| are correctly

    13  * preserved.

    14  */

    15 add_task(function* test_bytes() {

    16   let path = OS.Path.join(OS.Constants.Path.tmpDir,

    17                           "test_osfile_async_bytes.tmp");

    18   let file = yield OS.File.open(path, {trunc: true, read: true, write: true});

    19   try {

    20     try {

    21       // 1. Test write, by supplying {bytes:} options smaller than the actual

    22       // buffer.

    23       yield file.write(new Uint8Array(2048), {bytes: 1024});

    24       do_check_eq((yield file.stat()).size, 1024);

    26       // 2. Test same for |readTo|.

    27       yield file.setPosition(0, OS.File.POS_START);

    28       let read = yield file.readTo(new Uint8Array(1024), {bytes: 512});

    29       do_check_eq(read, 512);

    31       // 3. Test that passing nullish values for |options| still works.

    32       yield file.setPosition(0, OS.File.POS_END);

    33       yield file.write(new Uint8Array(1024), null);

    34       yield file.write(new Uint8Array(1024), undefined);

    35       do_check_eq((yield file.stat()).size, 3072);

    36     } finally {

    37       yield file.close();

    38     }

    39   } finally {

    40     yield OS.File.remove(path);

    41   }

    42 });

    44 add_task(do_test_finished);

The Tor Browser / file revision