gecko/storage/test/unit/test_sqlite_secure_delete.js

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 * The contents of this file are subject to the Mozilla Public License Version
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 * for the specific language governing rights and limitations under the
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 * The Original Code is Storage Test Code.
 *
 * The Initial Developer of the Original Code is
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 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Shawn Wilsher <me@shawnwilsher.com> (Original Author)
 *
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/**
 * This file tests to make sure that SQLite was compiled with
 * SQLITE_SECURE_DELETE=1.
 */

////////////////////////////////////////////////////////////////////////////////
//// Helper Methods

/**
 * Reads the contents of a file and returns it as a string.
 *
 * @param aFile
 *        The file to return from.
 * @return the contents of the file in the form of a string.
 */
function getFileContents(aFile)
{
  let fstream = Cc["@mozilla.org/network/file-input-stream;1"].
                createInstance(Ci.nsIFileInputStream);
  fstream.init(aFile, -1, 0, 0);

  let bstream = Cc["@mozilla.org/binaryinputstream;1"].
                createInstance(Ci.nsIBinaryInputStream);
  bstream.setInputStream(fstream);
  return bstream.readBytes(bstream.available());
}

////////////////////////////////////////////////////////////////////////////////
//// Tests

function test_delete_removes_data()
{
  const TEST_STRING = "SomeRandomStringToFind";

  let file = getTestDB();
  let db = getService().openDatabase(file);

  // Create the table and insert the data.
  db.createTable("test", "data TEXT");
  let stmt = db.createStatement("INSERT INTO test VALUES(:data)");
  stmt.params.data = TEST_STRING;
  try {
    stmt.execute();
  }
  finally {
    stmt.finalize();
  }

  // Make sure this test is actually testing what it thinks by making sure the
  // string shows up in the database.  Because the previous statement was
  // automatically wrapped in a transaction, the contents are already on disk.
  let contents = getFileContents(file);
  do_check_neq(-1, contents.indexOf(TEST_STRING));

  // Delete the data, and then close the database.
  stmt = db.createStatement("DELETE FROM test WHERE data = :data");
  stmt.params.data = TEST_STRING;
  try {
    stmt.execute();
  }
  finally {
    stmt.finalize();
  }
  db.close();

  // Check the file to see if the string can be found.
  contents = getFileContents(file);
  do_check_eq(-1, contents.indexOf(TEST_STRING));

  run_next_test();
}

////////////////////////////////////////////////////////////////////////////////
//// Test Runner

var tests =
[
  test_delete_removes_data,
];
let index = 0;

function run_next_test()
{
  if (index < tests.length) {
    do_test_pending();
    print("Running the next test: " + tests[index].name);
    tests[index++]();
  }

  do_test_finished();
}

function run_test()
{
  cleanup();

  do_test_pending();
  run_next_test();
}