test_TelemetryLockCount.js

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/* Any copyright is dedicated to the Public Domain.

   http://creativecommons.org/publicdomain/zero/1.0/

*/

/* A testcase to make sure reading the failed profile lock count works.  */

const LOCK_FILE_NAME = "Telemetry.FailedProfileLocks.txt";

const N_FAILED_LOCKS = 10;

// Constants from prio.h for nsIFileOutputStream.init

const PR_WRONLY = 0x2;

const PR_CREATE_FILE = 0x8;

const PR_TRUNCATE = 0x20;

const RW_OWNER = parseInt("0600", 8);

function write_string_to_file(file, contents) {

  let ostream = Cc[

    "@mozilla.org/network/safe-file-output-stream;1"

  ].createInstance(Ci.nsIFileOutputStream);

  ostream.init(

    file,

    PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE,

    RW_OWNER,

    ostream.DEFER_OPEN

);

  ostream.write(contents, contents.length);

  ostream.QueryInterface(Ci.nsISafeOutputStream).finish();

  ostream.close();

function construct_file() {

  let profileDirectory = Services.dirsvc.get("ProfD", Ci.nsIFile);

  let file = profileDirectory.clone();

  file.append(LOCK_FILE_NAME);

  return file;

function run_test() {

  do_get_profile();

  Assert.equal(Telemetry.failedProfileLockCount, 0);

  write_string_to_file(construct_file(), N_FAILED_LOCKS.toString());

  // Make sure that we're not eagerly reading the count now that the

  // file exists.

  Assert.equal(Telemetry.failedProfileLockCount, 0);

  do_test_pending();

  Telemetry.asyncFetchTelemetryData(actual_test);

function actual_test() {

  Assert.equal(Telemetry.failedProfileLockCount, N_FAILED_LOCKS);

  Assert.ok(!construct_file().exists());

  do_test_finished();