@Test
public void filter() {

  environmentVariables.set(MY_PASSWORD_KEY, FILTERED);
  environmentVariables.set(MY_PASSWORD_KEY_2, FILTERED_2);
  ConfigFilter configFilter = new EnvironmentVariableConfigFilter();
  assertEquals(FILTERED, configFilter.filter(MY_PASSWORD_KEY));
  assertEquals(FILTERED_2, configFilter.filter(MY_PASSWORD_KEY_2));
}