参考一下okhttp的UT？
https://github.com/square/okhttp/blob/master/okhttp/src/test/java/okhttp3/OkHttpClientTest.java
比如这个builder里set了一堆属性，可以assert相应的get方法啥的

【 在 dpblue (deep blue) 的大作中提到: 】
:     public void customize(RestTemplate restTemplate) {
:         final HttpHost proxy = new HttpHost(PROXY_SERVER_HOST, PROXY_SERVER_PORT);
:         HttpClient httpClient = HttpClientBuilder.create()
: ...................
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