function getSampleRows(rowCount) {
  var employees = new Array(rowCount);
  for (var i = 0; i < rowCount; i++) {
    var employee = lf.testing.hrSchemaSampleData.generateSampleEmployeeData(db);
    employee.
        setId(i.toString()).
        setSalary(100 * i);
    employees[i] = employee;
  }

  return employees;
}
Generates sample emolyee data to be used for tests.
@param {number} rowCount The number of sample rows to be generated.
@return {!Array<!lf.Row>}