Allow setting ApplicationContext on MockServerWebExchange

Closes gh-34601

Author: rstoyanchev

Diff for: spring-test/src/main/java/org/springframework/mock/web/server/MockServerWebExchange.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -18,6 +18,7 @@
 
 import reactor.core.publisher.Mono;
 
+import org.springframework.context.ApplicationContext;
 import org.springframework.http.codec.ServerCodecConfigurer;
 import org.springframework.lang.Nullable;
 import org.springframework.mock.http.server.reactive.MockServerHttpRequest;
@@ -39,9 +40,15 @@
  */
 public final class MockServerWebExchange extends DefaultServerWebExchange {
 
-	private MockServerWebExchange(MockServerHttpRequest request, WebSessionManager sessionManager) {
-		super(request, new MockServerHttpResponse(), sessionManager,
-				ServerCodecConfigurer.create(), new AcceptHeaderLocaleContextResolver());
+
+	private MockServerWebExchange(
+			MockServerHttpRequest request, @Nullable WebSessionManager sessionManager,
+			@Nullable ApplicationContext applicationContext) {
+
+		super(request, new MockServerHttpResponse(),
+				sessionManager != null ? sessionManager : new DefaultWebSessionManager(),
+				ServerCodecConfigurer.create(), new AcceptHeaderLocaleContextResolver(),
+				applicationContext);
 	}
 
 
@@ -101,6 +108,9 @@ public static class Builder {
 		@Nullable
 		private WebSessionManager sessionManager;
 
+		@Nullable
+		private ApplicationContext applicationContext;
+
 		public Builder(MockServerHttpRequest request) {
 			this.request = request;
 		}
@@ -127,12 +137,21 @@ public Builder sessionManager(WebSessionManager sessionManager) {
 			return this;
 		}
 
+		/**
+		 * Provide the {@code ApplicationContext} to expose through the exchange.
+		 * @param applicationContext the context to use
+		 * @since 6.2.5
+		 */
+		public Builder applicationContext(ApplicationContext applicationContext) {
+			this.applicationContext = applicationContext;
+			return this;
+		}
+
 		/**
 		 * Build the {@code MockServerWebExchange} instance.
 		 */
 		public MockServerWebExchange build() {
-			return new MockServerWebExchange(this.request,
-					this.sessionManager != null ? this.sessionManager : new DefaultWebSessionManager());
+			return new MockServerWebExchange(this.request, this.sessionManager, this.applicationContext);
 		}
 	}
 

Diff for: spring-web/src/main/java/org/springframework/web/server/adapter/DefaultServerWebExchange.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -119,7 +119,7 @@ public DefaultServerWebExchange(ServerHttpRequest request, ServerHttpResponse re
 		this(request, response, sessionManager, codecConfigurer, localeContextResolver, null);
 	}
 
-	DefaultServerWebExchange(ServerHttpRequest request, ServerHttpResponse response,
+	protected DefaultServerWebExchange(ServerHttpRequest request, ServerHttpResponse response,
 			WebSessionManager sessionManager, ServerCodecConfigurer codecConfigurer,
 			LocaleContextResolver localeContextResolver, @Nullable ApplicationContext applicationContext) {