Update WebFlux samples to use Spring Boot

Fixes: gh-5411

samples/boot/hellowebflux/src/integration-test/java/sample/HelloWebfluxApplicationITests.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright 2002-2017 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package sample;
+
+import static org.springframework.web.reactive.function.client.ExchangeFilterFunctions.Credentials.basicAuthenticationCredentials;
+
+import java.util.Map;
+import java.util.function.Consumer;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.reactive.server.WebTestClient;
+import org.springframework.web.reactive.function.client.ExchangeFilterFunctions;
+
+/**
+ * @author Rob Winch
+ * @since 5.0
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+public class HelloWebfluxApplicationITests {
+
+	WebTestClient rest;
+
+	@Autowired
+	public void setRest(WebTestClient rest) {
+		this.rest = rest
+				.mutateWith((b, h, c) -> b.filter(ExchangeFilterFunctions.basicAuthentication()));
+	}
+
+	@Test
+	public void basicWhenNoCredentialsThenUnauthorized() throws Exception {
+		this.rest
+			.get()
+			.uri("/")
+			.exchange()
+			.expectStatus().isUnauthorized();
+	}
+
+	@Test
+	public void basicWhenValidCredentialsThenOk() throws Exception {
+		this.rest
+			.get()
+			.uri("/")
+			.attributes(userCredentials())
+			.exchange()
+			.expectStatus().isOk()
+			.expectBody().json("{\"message\":\"Hello user!\"}");
+	}
+
+	@Test
+	public void basicWhenInvalidCredentialsThenUnauthorized() throws Exception {
+		this.rest
+			.get()
+			.uri("/")
+			.attributes(invalidCredentials())
+			.exchange()
+			.expectStatus().isUnauthorized()
+			.expectBody().isEmpty();
+	}
+
+	private Consumer<Map<String, Object>> userCredentials() {
+		return basicAuthenticationCredentials("user", "user");
+	}
+
+	private Consumer<Map<String, Object>> invalidCredentials() {
+		return basicAuthenticationCredentials("user", "INVALID");
+	}
+}