function testExec_ThrowsMissingInto() {
  var query = new lf.query.InsertBuilder(hr.db.getGlobal());
  var job = lf.testing.hrSchemaSampleData.generateSampleJobData(db);
  query.values([job]);
  // 518: Invalid usage of insert().
  return lf.testing.util.assertPromiseReject(518, query.exec());
}
Tests that Insert#exec() fails if into() has not been called first.
@return {!IThenable}