Make MockClientHttpResponse uses raw status code

This commit make sure that MockClientHttpResponse does not use
HttpStatus, but the raw status code.

Closes gh-23599

spring-test/src/main/java/org/springframework/test/web/reactive/server/HttpHandlerConnector.java

 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,7 +17,6 @@
 package org.springframework.test.web.reactive.server;
 
 import java.net.URI;
-import java.util.Optional;
 import java.util.function.Function;
 
 import org.apache.commons.logging.Log;
@@ -31,7 +30,6 @@ import org.springframework.core.io.buffer.DataBuffer;
 import org.springframework.http.HttpCookie;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
-import org.springframework.http.HttpStatus;
 import org.springframework.http.client.reactive.ClientHttpConnector;
 import org.springframework.http.client.reactive.ClientHttpRequest;
 import org.springframework.http.client.reactive.ClientHttpResponse;
@@ -121,8 +119,8 @@ public class HttpHandlerConnector implements ClientHttpConnector {
 	}
 
 	private ClientHttpResponse adaptResponse(MockServerHttpResponse response, Flux<DataBuffer> body) {
-		HttpStatus status = Optional.ofNullable(response.getStatusCode()).orElse(HttpStatus.OK);
-		MockClientHttpResponse clientResponse = new MockClientHttpResponse(status);
+		Integer status = response.getStatusCodeValue();
+		MockClientHttpResponse clientResponse = new MockClientHttpResponse((status != null) ? status : 200);
 		clientResponse.getHeaders().putAll(response.getHeaders());
 		clientResponse.getCookies().putAll(response.getCookies());
 		clientResponse.setBody(body);