1 files changed, 56 insertions, 0 deletions
diff --git a/toolkit/components/telemetry/tests/unit/test_TelemetryLockCount.js b/toolkit/components/telemetry/tests/unit/test_TelemetryLockCount.js
new file mode 100644
index 0000000000..7f9322e37c
--- /dev/null
+++ b/toolkit/components/telemetry/tests/unit/test_TelemetryLockCount.js
@@ -0,0 +1,56 @@
+/* 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();
+}