@ParameterizedTest
    @ArgumentsSource(ClientAndProtocolProvider.class)
    void testAdditionalTrailersNoOtherTrailers(WebClient client, SessionProtocol protocol) {
        assumeThat(protocol.isMultiplex()).isTrue();

        final HttpHeaders trailers = client.get("/additional-trailers-no-other-trailers")
                                           .aggregate().join().trailers();
        assertThat(trailers.get(HttpHeaderNames.of("additional-trailer"))).isEqualTo("value2");
    }
Similar to {@link #testTimeoutAfterPartialContent(WebClient)}, but tests the case where the service
produces a pooled buffers.
core/src/test/java/com/linecorp/armeria/server/HttpServerTest.java