@Test
public void testGetXmlClobPropertyAndUnmarshallToObjectConfigurationValueIsBlank()
{

    // Create a mock configuration entity.
    ConfigurationEntity configurationEntity = mock(ConfigurationEntity.class);
    when(configurationEntity.getValueClob()).thenReturn(BLANK_TEXT);
    // Mock the external calls.
    when(configurationDao.getConfigurationByKey(CONFIGURATION_KEY)).thenReturn(configurationEntity);
    // Call the method under test.
    String result = configurationDaoHelper.getXmlClobPropertyAndUnmarshallToObject(String.class, CONFIGURATION_KEY);
    // Verify the external calls.
    verify(configurationDao).getConfigurationByKey(CONFIGURATION_KEY);
    verifyNoMoreInteractionsHelper();
    // Validate the results.
    assertNull(result);
}