Configure WebTestClient to be able to consume large responses

Closes gh-19566

Author: wilkinsona

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/integrationtest/WebMvcEndpointExposureIntegrationTests.java

@@ -50,6 +50,7 @@
 import org.springframework.test.web.reactive.server.EntityExchangeResult;
 import org.springframework.test.web.reactive.server.WebTestClient;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.reactive.function.client.ExchangeStrategies;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -159,7 +160,10 @@ public void singleWebEndpointCanBeExcluded() {
 	private WebTestClient createClient(AssertableWebApplicationContext context) {
 		int port = context.getSourceApplicationContext(ServletWebServerApplicationContext.class).getWebServer()
 				.getPort();
-		return WebTestClient.bindToServer().baseUrl("http://localhost:" + port).build();
+		ExchangeStrategies exchangeStrategies = ExchangeStrategies.builder()
+				.codecs((configurer) -> configurer.defaultCodecs().maxInMemorySize(512 * 1024)).build();
+		return WebTestClient.bindToServer().baseUrl("http://localhost:" + port).exchangeStrategies(exchangeStrategies)
+				.build();
 	}
 
 	private boolean isExposed(WebTestClient client, HttpMethod method, String path) throws Exception {