@Test
    void aggregatedJson() throws Exception {
        expectAggregatedJson(Stream.of(TEST_STRINGS))
                .expectComplete()
                .verify();
        expectAggregatedJson(Flux.fromArray(TEST_STRINGS))
                .expectComplete()
                .verify();

        // Iterable with trailers.
        final HttpHeaders trailer = HttpHeaders.of(AsciiString.of("x-trailer"), "value");
        expectAggregatedJson(Arrays.asList(TEST_STRINGS), JSON_HEADERS, trailer)
                .expectNext(trailer)
                .expectComplete()
                .verify();
    }
{@link HttpData} instances which are expected to be produced by the
{@link JacksonResponseConverterFunction} when the function gets the
{@link #TEST_STRINGS} as input.
core/src/test/java/com/linecorp/armeria/server/annotation/JacksonResponseConverterFunctionTest.java