@Test
public void test_getPoliciesAsStringFromJson_successfully() throws IOException {

    ObjectMapper mapper = new ObjectMapper();
    String policyjson = "{\"data\":{\"policies\":[\"w_users_safe02\",\"w_users_safe01\"]}}";
    String actualResponse = ControllerUtil.getPoliciesAsStringFromJson(mapper, policyjson);
    assertEquals("w_users_safe02,w_users_safe01", actualResponse);
}