WebTestClient (server-less) setup accepts WebFilter's

Issue: SPR-15349

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

@@ -16,10 +16,14 @@
 
 package org.springframework.test.web.reactive.server;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
 import java.util.function.UnaryOperator;
 
-import org.springframework.http.server.reactive.HttpHandler;
 import org.springframework.web.server.ServerWebExchange;
+import org.springframework.web.server.WebFilter;
 import org.springframework.web.server.adapter.WebHttpHandlerBuilder;
 
 /**
@@ -33,6 +37,13 @@ abstract class AbstractMockServerSpec<B extends WebTestClient.MockServerSpec<B>>
 
 	private final ExchangeMutatorWebFilter exchangeMutatorFilter = new ExchangeMutatorWebFilter();
 
+	private final List<WebFilter> filters = new ArrayList<>(4);
+
+
+	AbstractMockServerSpec() {
+		this.filters.add(this.exchangeMutatorFilter);
+	}
+
 
 	@Override
 	public <T extends B> T exchangeMutator(UnaryOperator<ServerWebExchange> mutator) {
@@ -40,6 +51,12 @@ abstract class AbstractMockServerSpec<B extends WebTestClient.MockServerSpec<B>>
 		return self();
 	}
 
+	@Override
+	public <T extends B> T webFilter(WebFilter... filter) {
+		this.filters.addAll(Arrays.asList(filter));
+		return self();
+	}
+
 	@SuppressWarnings("unchecked")
 	private <T extends B> T self() {
 		return (T) this;
@@ -48,12 +65,25 @@ abstract class AbstractMockServerSpec<B extends WebTestClient.MockServerSpec<B>>
 
 	@Override
 	public WebTestClient.Builder configureClient() {
-		HttpHandler handler = initHttpHandlerBuilder().prependFilter(this.exchangeMutatorFilter).build();
-		return new DefaultWebTestClientBuilder(handler, this.exchangeMutatorFilter);
+		WebHttpHandlerBuilder builder = initHttpHandlerBuilder();
+		filtersInReverse().forEach(builder::prependFilter);
+		return new DefaultWebTestClientBuilder(builder.build(), this.exchangeMutatorFilter);
 	}
 
+	/**
+	 * Sub-classes to create the {@code WebHttpHandlerBuilder} to use.
+	 */
 	protected abstract WebHttpHandlerBuilder initHttpHandlerBuilder();
 
+	/**
+	 * Return the filters in reverse order for pre-pending.
+	 */
+	private List<WebFilter> filtersInReverse() {
+		List<WebFilter> result = new ArrayList<>(this.filters);
+		Collections.reverse(result);
+		return result;
+	}
+
 	@Override
 	public WebTestClient build() {
 		return configureClient().build();

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

@@ -50,6 +50,7 @@ import org.springframework.web.reactive.function.client.ExchangeStrategies;
 import org.springframework.web.reactive.function.client.WebClient;
 import org.springframework.web.reactive.function.server.RouterFunction;
 import org.springframework.web.server.ServerWebExchange;
+import org.springframework.web.server.WebFilter;
 import org.springframework.web.util.UriBuilder;
 import org.springframework.web.util.UriBuilderFactory;
 
@@ -193,6 +194,12 @@ public interface WebTestClient {
 		 */
 		<T extends B> T exchangeMutator(UnaryOperator<ServerWebExchange> mutator);
 
+		/**
+		 * Configure {@link WebFilter}'s for server request processing.
+		 * @param filter one or more filters
+		 */
+		<T extends B> T webFilter(WebFilter... filter);
+
 		/**
 		 * Proceed to configure and build the test client.
 		 */

spring-test/src/test/java/org/springframework/test/web/reactive/server/samples/bind/ApplicationContextTests.java

@@ -32,9 +32,7 @@ import org.springframework.web.bind.annotation.RequestAttribute;
 import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.reactive.config.EnableWebFlux;
 import org.springframework.web.server.ServerWebExchange;
-
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.when;
+import org.springframework.web.server.WebFilter;
 
 /**
  * Binding to server infrastructure declared in a Spring ApplicationContext.
@@ -56,24 +54,16 @@ public class ApplicationContextTests {
 
 		this.client = WebTestClient.bindToApplicationContext(context)
 				.exchangeMutator(principal("Pablo"))
+				.webFilter(prefixFilter("Mr."))
 				.build();
 	}
 
-	private UnaryOperator<ServerWebExchange> principal(String userName) {
-		return exchange -> {
-			Principal user = mock(Principal.class);
-			when(user.getName()).thenReturn(userName);
-			return exchange.mutate().principal(Mono.just(user)).build();
-		};
-	}
-
-
 	@Test
 	public void basic() throws Exception {
 		this.client.get().uri("/principal")
 				.exchange()
 				.expectStatus().isOk()
-				.expectBody(String.class).value().isEqualTo("Hello Pablo!");
+				.expectBody(String.class).value().isEqualTo("Hello Mr. Pablo!");
 	}
 
 	@Test
@@ -82,7 +72,7 @@ public class ApplicationContextTests {
 				.get().uri("/principal")
 				.exchange()
 				.expectStatus().isOk()
-				.expectBody(String.class).value().isEqualTo("Hello Giovanni!");
+				.expectBody(String.class).value().isEqualTo("Hello Mr. Giovanni!");
 	}
 
 	@Test
@@ -96,6 +86,18 @@ public class ApplicationContextTests {
 				.expectBody(String.class).value().isEqualTo("foo+bar");
 	}
 
+
+	private UnaryOperator<ServerWebExchange> principal(String userName) {
+		return exchange -> exchange.mutate().principal(Mono.just(new TestUser(userName))).build();
+	}
+
+	private WebFilter prefixFilter(String prefix) {
+		return (exchange, chain) -> {
+			Mono<Principal> user = exchange.getPrincipal().map(p -> new TestUser(prefix + " " + p.getName()));
+			return chain.filter(exchange.mutate().principal(user).build());
+		};
+	}
+
 	private UnaryOperator<ServerWebExchange> attribute(String attrName, String attrValue) {
 		return exchange -> {
 			exchange.getAttributes().put(attrName, attrValue);
@@ -129,4 +131,18 @@ public class ApplicationContextTests {
 		}
 	}
 
+	private static class TestUser implements Principal {
+
+		private final String name;
+
+		TestUser(String name) {
+			this.name = name;
+		}
+
+		@Override
+		public String getName() {
+			return this.name;
+		}
+	}
+
 }

spring-test/src/test/java/org/springframework/test/web/reactive/server/samples/bind/ControllerTests.java

@@ -27,9 +27,7 @@ import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestAttribute;
 import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.server.ServerWebExchange;
-
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.when;
+import org.springframework.web.server.WebFilter;
 
 /**
  * Bind to annotated controllers.
@@ -39,27 +37,18 @@ import static org.mockito.Mockito.when;
  */
 public class ControllerTests {
 
-	private final WebTestClient client = WebTestClient
-			.bindToController(new TestController())
+	private final WebTestClient client = WebTestClient.bindToController(new TestController())
 			.exchangeMutator(principal("Pablo"))
+			.webFilter(prefixFilter("Mr."))
 			.build();
 
 
-	private UnaryOperator<ServerWebExchange> principal(String userName) {
-		return exchange -> {
-			Principal user = mock(Principal.class);
-			when(user.getName()).thenReturn(userName);
-			return exchange.mutate().principal(Mono.just(user)).build();
-		};
-	}
-
-
 	@Test
 	public void basic() throws Exception {
 		this.client.get().uri("/principal")
 				.exchange()
 				.expectStatus().isOk()
-				.expectBody(String.class).value().isEqualTo("Hello Pablo!");
+				.expectBody(String.class).value().isEqualTo("Hello Mr. Pablo!");
 	}
 
 	@Test
@@ -68,7 +57,7 @@ public class ControllerTests {
 				.get().uri("/principal")
 				.exchange()
 				.expectStatus().isOk()
-				.expectBody(String.class).value().isEqualTo("Hello Giovanni!");
+				.expectBody(String.class).value().isEqualTo("Hello Mr. Giovanni!");
 	}
 
 	@Test
@@ -82,6 +71,18 @@ public class ControllerTests {
 				.expectBody(String.class).value().isEqualTo("foo+bar");
 	}
 
+
+	private UnaryOperator<ServerWebExchange> principal(String userName) {
+		return exchange -> exchange.mutate().principal(Mono.just(new TestUser(userName))).build();
+	}
+
+	private WebFilter prefixFilter(String prefix) {
+		return (exchange, chain) -> {
+			Mono<Principal> user = exchange.getPrincipal().map(p -> new TestUser(prefix + " " + p.getName()));
+			return chain.filter(exchange.mutate().principal(user).build());
+		};
+	}
+
 	private UnaryOperator<ServerWebExchange> attribute(String attrName, String attrValue) {
 		return exchange -> {
 			exchange.getAttributes().put(attrName, attrValue);
@@ -104,4 +105,18 @@ public class ControllerTests {
 		}
 	}
 
+	private static class TestUser implements Principal {
+
+		private final String name;
+
+		TestUser(String name) {
+			this.name = name;
+		}
+
+		@Override
+		public String getName() {
+			return this.name;
+		}
+	}
+
 }