Decode servletPath in HtmlUnitRequestBuilder

Closes gh-27837

spring-test/src/main/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilder.java

@@ -57,6 +57,7 @@ import org.springframework.util.ObjectUtils;
 import org.springframework.util.StringUtils;
 import org.springframework.web.util.UriComponents;
 import org.springframework.web.util.UriComponentsBuilder;
+import org.springframework.web.util.UriUtils;
 
 /**
  * Internal class used to transform a {@link WebRequest} into a
@@ -262,6 +263,7 @@ final class HtmlUnitRequestBuilder implements RequestBuilder, Mergeable {
 		String path = uriComponents.getPath();
 		String requestPath = (path != null ? path : "");
 		String servletPath = requestPath.substring(request.getContextPath().length());
+		servletPath = UriUtils.decode(servletPath, StandardCharsets.UTF_8);
 		request.setServletPath(servletPath);
 	}
 

spring-test/src/test/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilderTests.java

@@ -782,6 +782,16 @@ public class HtmlUnitRequestBuilderTests {
 		assertThat(actualRequest.getServletPath()).isEqualTo("/this/here");
 	}
 
+	@Test // gh-27837
+	public void buildRequestServletPathWithEncodedUrl() throws Exception {
+		webRequest.setUrl(new URL("http://localhost/test/Fr%C3%BChling%20Sommer%20Herbst%20Winter"));
+
+		MockHttpServletRequest actualRequest = requestBuilder.buildRequest(servletContext);
+
+		assertThat(actualRequest.getRequestURI()).isEqualTo("/test/Fr%C3%BChling%20Sommer%20Herbst%20Winter");
+		assertThat(actualRequest.getServletPath()).isEqualTo("/Frühling Sommer Herbst Winter");
+	}
+
 	@Test
 	public void buildRequestSession() throws Exception {
 		MockHttpServletRequest actualRequest = requestBuilder.buildRequest(servletContext);