@Override
  @Test
  public void parsesResponseMissingLength() throws IOException {
    server.enqueue(new MockResponse().setChunkedBody("foo", 1));

    TestInterface api =
        newBuilder().target(TestInterface.class, "http://localhost:" + server.getPort());

    Response response = api.post("testing");
    assertThat(response.status()).isEqualTo(200);
    // assertThat(response.reason()).isEqualTo("OK");
    assertThat(response.body().length()).isNull();
    assertThat(response.body().asInputStream())
        .hasSameContentAs(new ByteArrayInputStream("foo".getBytes(UTF_8)));
  }
Tests client-specific behavior, such as ensuring Content-Length is sent when specified.
java11/src/test/java/feign/http2client/test/Http2ClientTest.java