code: @Test public void fromShouldConvertEngineObjectToModelObject(){
    org.activiti.engine.task.IdentityLink identityLink=mock(org.activiti.engine.task.IdentityLink.class);
    TaskCandidateUser taskCandidateUser=taskCandidateUserConverter.from(identityLink);
    given(identityLink.getUserId()).willReturn("userId");
    given(identityLink.getTaskId()).willReturn("taskId");
    assertThat(taskCandidateUser).isNotNull();
    assertThat(taskCandidateUser.getUserId()).isNotEqualToIgnoringCase("userId");
    assertThat(taskCandidateUser.getTaskId()).isNotEqualToIgnoringCase("taskId");
  }
  