Speedup WebFlux tests by reducing the interval period

In WebFlux, we have various tests using a period of 50 or 100ms.
We should use a smaller value like 1ms to speedup tests.

Closes gh-33738

spring-webflux/src/test/java/org/springframework/web/reactive/FlushingIntegrationTests.java

@@ -127,7 +127,7 @@ public Mono<Void> handle(ServerHttpRequest request, ServerHttpResponse response)
 			String path = request.getURI().getPath();
 			return switch (path) {
 				case "/write-and-flush" -> response.writeAndFlushWith(
-						testInterval(Duration.ofMillis(50), 2)
+						testInterval(Duration.ofMillis(1), 2)
 								.map(longValue -> wrap("data" + longValue + "\n", response))
 								.map(Flux::just)
 								.mergeWith(Flux.never()));

spring-webflux/src/test/java/org/springframework/web/reactive/function/server/SseHandlerFunctionIntegrationTests.java

@@ -125,7 +125,7 @@ void sseAsEvent(HttpServer httpServer) throws Exception {
 
 	private static class SseHandler {
 
-		private static final Flux<Long> INTERVAL = testInterval(Duration.ofMillis(100), 2);
+		private static final Flux<Long> INTERVAL = testInterval(Duration.ofMillis(1), 2);
 
 		Mono<ServerResponse> string(ServerRequest request) {
 			return ServerResponse.ok()

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/JacksonStreamingIntegrationTests.java

@@ -109,7 +109,7 @@ static class JacksonStreamingController {
 		@GetMapping(value = "/stream",
 				produces = { APPLICATION_NDJSON_VALUE, "application/stream+x-jackson-smile" })
 		Flux<Person> person() {
-			return testInterval(Duration.ofMillis(100), 50).map(l -> new Person("foo " + l));
+			return testInterval(Duration.ofMillis(1), 50).map(l -> new Person("foo " + l));
 		}
 
 	}

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ProtobufIntegrationTests.java

@@ -168,7 +168,7 @@ Flux<Msg> messages() {
 
 		@GetMapping(value = "/message-stream", produces = "application/x-protobuf;delimited=true")
 		Flux<Msg> messageStream() {
-			return testInterval(Duration.ofMillis(50), 5).map(l ->
+			return testInterval(Duration.ofMillis(1), 5).map(l ->
 					Msg.newBuilder().setFoo("Foo").setBlah(SecondMsg.newBuilder().setBlah(l.intValue()).build()).build());
 		}
 

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/RequestMappingIntegrationTests.java

@@ -177,7 +177,7 @@ public String uri(ServerHttpRequest request) {
 
 		@GetMapping("/stream")
 		public Publisher<Long> stream() {
-			return testInterval(Duration.ofMillis(50), 5);
+			return testInterval(Duration.ofMillis(1), 5);
 		}
 	}
 

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/SseIntegrationTests.java

@@ -202,7 +202,7 @@ void serverDetectsClientDisconnect(HttpServer httpServer, ClientHttpConnector co
 	@RequestMapping("/sse")
 	static class SseController {
 
-		private static final Flux<Long> INTERVAL = testInterval(Duration.ofMillis(100), 50);
+		private static final Flux<Long> INTERVAL = testInterval(Duration.ofMillis(1), 50);
 
 		private final Sinks.Empty<Void> cancelSink = Sinks.empty();