@Test
  void safeRebuffering() {
    server.enqueue(new MockResponse().setBody("foo"));

    TestInterface api =
        newBuilder()
            .logger(
                new Logger() {
                  @Override
                  protected void log(String configKey, String format, Object... args) {}
                })
            .logLevel(Logger.Level.FULL) // rebuffers the body
            .target(TestInterface.class, "http://localhost:" + server.getPort());

    api.post("foo");
  }
Some client implementation tests should override this test if the PATCH operation is
unsupported.
core/src/test/java/feign/client/AbstractClientTest.java