static List<ProviderInfo> convertInstancesToProviders(List<Instance> allInstances) {
        List<ProviderInfo> providerInfos = new ArrayList<ProviderInfo>();
        if (CommonUtils.isEmpty(allInstances)) {
            return providerInfos;
        }

        for (Instance instance : allInstances) {
            String url = convertInstanceToUrl(instance);
            ProviderInfo providerInfo = ProviderHelper.toProviderInfo(url);

            // Nacos的默认权重为1.0
            // 当Nacos默认权重传入1.0，根据代码逻辑计算结果为100，与sofa-rpc默认权重一致
            // 因为是接口级别，如果不同的服务具有不同的权重也不会出现被覆盖或者冲突的情况
            long weight = Math.round(providerInfo.getWeight() * instance.getWeight());
            providerInfo.setWeight(Math.round(weight));

            providerInfos.add(providerInfo);
        }
        return providerInfos;
    }
@Test
    public void testNacosWeightWith0() {
        Instance instance = new Instance();
        instance.setClusterName(NacosRegistryHelper.DEFAULT_CLUSTER);
        instance.setIp("1.1.1.1");
        instance.setPort(12200);
        instance.setServiceName("com.alipay.xxx.TestService");
        instance.setWeight(0.0D);

        List<ProviderInfo> providerInfos = NacosRegistryHelper
            .convertInstancesToProviders(Lists.newArrayList(instance));
        assertNotNull(providerInfos);
        assertEquals(1, providerInfos.size());

        ProviderInfo providerInfo = providerInfos.get(0);
        assertNotNull(providerInfo);
        assertEquals(0, providerInfo.getWeight());
    }