'How to design void method junit test?

public class ParmsData {

    @Autowired
    private ParamsCache paramsCache;

    private Map<String, List<String>> beanData = Collections.synchronizedMap(new HashMap<>());

    public void init(){
        this.beanData = Collections.synchronizedMap(paramsCache.allParams().stream()
                .collect(Collectors.toMap(FxParams:: getSysPara, param -> Arrays.stream(param.getSysParaValue().split(",")).collect(Collectors.toList()))));
    }
}
  1. How to design init() method junit test?
  2. Please give me the exmple code thanks.
javaspring-bootjunit


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