Add RequestAttributeArgumentResolver

Closes gh-28458

spring-web/src/test/java/org/springframework/web/service/invoker/PathVariableArgumentResolverTests.java

@@ -48,8 +48,7 @@ class PathVariableArgumentResolverTests {
 
 	@SuppressWarnings("SameParameterValue")
 	private void assertPathVariable(String name, @Nullable String expectedValue) {
-		assertThat(this.client.getRequestValues().getUriVariables().get(name))
-				.isEqualTo(expectedValue);
+		assertThat(this.client.getRequestValues().getUriVariables().get(name)).isEqualTo(expectedValue);
 	}
 
 

spring-web/src/test/java/org/springframework/web/service/invoker/RequestAttributeArgumentResolverTests.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2002-2022 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
+ *
+ *      https://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 org.springframework.web.service.invoker;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.lang.Nullable;
+import org.springframework.web.bind.annotation.RequestAttribute;
+import org.springframework.web.service.annotation.GetExchange;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Unit tests for {@link RequestAttributeArgumentResolver}.
+ * <p>For base class functionality, see {@link NamedValueArgumentResolverTests}.
+ *
+ * @author Rossen Stoyanchev
+ */
+class RequestAttributeArgumentResolverTests {
+
+	private final TestHttpClientAdapter client = new TestHttpClientAdapter();
+
+	private final Service service = HttpServiceProxyFactory.builder(this.client).build().createClient(Service.class);
+
+
+	// Base class functionality should be tested in NamedValueArgumentResolverTests.
+
+	@Test
+	void cookieValue() {
+		this.service.execute("test");
+		assertAttribute("attribute", "test");
+	}
+
+	@SuppressWarnings("SameParameterValue")
+	private void assertAttribute(String name, @Nullable String expectedValue) {
+		assertThat(this.client.getRequestValues().getAttributes().get(name)).isEqualTo(expectedValue);
+	}
+
+
+	private interface Service {
+
+		@GetExchange
+		void execute(@RequestAttribute String attribute);
+
+	}
+
+}