Clean up warnings and delete dead code

spring-web/src/test/java/org/springframework/http/ResponseCookieTests.java

@@ -13,13 +13,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.http;
 
 import java.time.Duration;
-import java.time.Instant;
-import java.time.ZoneId;
-import java.time.ZonedDateTime;
-import java.time.format.DateTimeFormatter;
 
 import org.junit.Test;
 

spring-web/src/test/java/org/springframework/http/converter/FormHttpMessageConverterTests.java

@@ -30,7 +30,6 @@ import org.apache.commons.fileupload.FileItemFactory;
 import org.apache.commons.fileupload.FileUpload;
 import org.apache.commons.fileupload.RequestContext;
 import org.apache.commons.fileupload.disk.DiskFileItemFactory;
-import org.hamcrest.CoreMatchers;
 import org.hamcrest.Matchers;
 import org.junit.Test;
 

spring-web/src/test/java/org/springframework/web/cors/reactive/UrlBasedCorsConfigurationSourceTests.java

@@ -21,7 +21,6 @@ import org.junit.Test;
 import org.springframework.mock.http.server.reactive.test.MockServerHttpRequest;
 import org.springframework.mock.web.test.server.MockServerWebExchange;
 import org.springframework.web.cors.CorsConfiguration;
-import org.springframework.web.util.pattern.PathPatternParser;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNull;

spring-web/src/test/java/org/springframework/web/util/UriComponentsTests.java

@@ -24,13 +24,9 @@ import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.Arrays;
 import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
 
 import org.junit.Test;
 
-import org.springframework.web.util.UriComponents.UriTemplateVariables;
-
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.instanceOf;
 import static org.hamcrest.Matchers.not;