The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

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

  */

 // Make sure that there are telemetry entries created by sqlite io

 function run_sql(d, sql) {

   var stmt = d.createStatement(sql)

   stmt.execute()

   stmt.finalize();

 }

 function new_file(name)

 {

   var file = dirSvc.get("ProfD", Ci.nsIFile);

   file.append(name);

   return file;

 }

 function run_test()

 {

   const Telemetry = Cc["@mozilla.org/base/telemetry;1"].getService(Ci.nsITelemetry);

   let read_hgram = Telemetry.getHistogramById("MOZ_SQLITE_OTHER_READ_B");

   let old_sum = read_hgram.snapshot().sum;

   const file = new_file("telemetry.sqlite");

   var d = getDatabase(file);

   run_sql(d, "CREATE TABLE bloat(data varchar)");

   run_sql(d, "DROP TABLE bloat")

   do_check_true(read_hgram.snapshot().sum > old_sum)

 }