DSG Netflix - having issue while running integration test case

Question

  @DgsMutation
    public CompletableFuture<CreateResponse> createAttachment(@InputArgument(REQUEST) @Valid @NotNull AttachmentCreateRequest attachment,
            @RequestHeader(name = "EVENT_ID") String header) {
        return attachmentService.createAttachment(attachment)
                .contextWrite(context -> context.put("EVENT_ID", header))
                .toFuture();
    }

Integration Test Case

@ActiveProfiles(resolver = IntegrationTestActiveProfileResolver.class)
@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
class AttachmentQueriesIntegrationTest {
  @Autowired
    private GraphQLTestTemplate graphQLTestTemplate;

    @Test
    void testShouldCreateAttachment() throws IOException {
        graphQLTestTemplate.withAdditionalHeader("EVENT_ID", "event011");
        GraphQLResponse response = graphQLTestTemplate.postForResource("graphql/test-create-attachment.graphql");
        assertNotNull(response);
        assertTrue(response.isOk());
        CreateResponse result = response.get("$.data.createAttachment", CreateResponse.class);
        assertNotNull(result.getEntityId());
        assertNotNull(result.getTimestamp());
    }

2022-10-06 14:36:56.043 WARN 7112 --- [ graphql-exec-1] n.g.e.SimpleDataFetcherExceptionHandler : Exception while fetching data (/createAttachment) : graphQLContext[GraphQLContextKey.DGS_CONTEXT_KEY] must not be null

java.lang.NullPointerException: graphQLContext[GraphQLContextKey.DGS_CONTEXT_KEY] must not be null