@Test
public void loadEmptyStringFromNonExistingDelegationTokenFileTest() throws IOException {

    PowerMockito.mockStatic(ConfigFileReader.class);
    ConfigFileReader.ConfigFile configFile =
            PowerMockito.mock(ConfigFileReader.ConfigFile.class);
    PowerMockito.when(configFile.get("delegation_token_file"))
            .thenReturn("src/test/resources/unit_test_delegation_file_does_not_exist");
    assertEquals(
            ConfigFileDelegationTokenUtils.parseAndGetToken(configFile), StringUtils.EMPTY);
}