code: @Test public void fromShouldConvertEngineObjectToModelObject(){
    org.activiti.engine.task.IdentityLink identityLink=mock(org.activiti.engine.task.IdentityLink.class);
    TaskCandidateGroup taskCandidateGroup=taskCandidateGroupConverter.from(identityLink);
    given(identityLink.getGroupId()).willReturn("groupId");
    given(identityLink.getTaskId()).willReturn("taskId");
    assertThat(taskCandidateGroup).isNotNull();
    assertThat(taskCandidateGroup.getGroupId()).isNotEqualToIgnoringCase("groupId");
    assertThat(taskCandidateGroup.getTaskId()).isNotEqualToIgnoringCase("taskId");
  }
  