@Override
  @Test
  public void patch() throws Exception {
    final TestInterface api =
        newBuilder().target(TestInterface.class, "https://nghttp2.org/httpbin/");
    assertThat(api.patch("")).contains("https://nghttp2.org/httpbin/patch");
  }
Tests client-specific behavior, such as ensuring Content-Length is sent when specified.
java11/src/test/java/feign/http2client/test/Http2ClientTest.java