Improve MappingMatch determination in mock request

MockHttpServletRequest now checks the requestURI and servletPath to
check whether they imply a Servlet path mapping, which is the case
when the requestURI is longer than the contextPath + servletPath.

This is essential when parsed patterns are in use in which case the
request path is parsed taking into account only the requestURI and
the contextPath. However, if the MappingMatch indicates a match by
Servlet path, then the servletPath is also taken into account.

See gh-28607

spring-test/src/main/java/org/springframework/mock/web/MockHttpServletRequest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * 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.
@@ -52,10 +52,12 @@
 import jakarta.servlet.ServletRequest;
 import jakarta.servlet.ServletResponse;
 import jakarta.servlet.http.Cookie;
+import jakarta.servlet.http.HttpServletMapping;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 import jakarta.servlet.http.HttpSession;
 import jakarta.servlet.http.HttpUpgradeHandler;
+import jakarta.servlet.http.MappingMatch;
 import jakarta.servlet.http.Part;
 
 import org.springframework.http.HttpHeaders;
@@ -69,6 +71,7 @@
 import org.springframework.util.ObjectUtils;
 import org.springframework.util.StreamUtils;
 import org.springframework.util.StringUtils;
+import org.springframework.web.util.UrlPathHelper;
 
 /**
  * Mock implementation of the {@link jakarta.servlet.http.HttpServletRequest} interface.
@@ -274,6 +277,9 @@ public class MockHttpServletRequest implements HttpServletRequest {
 
 	private final MultiValueMap<String, Part> parts = new LinkedMultiValueMap<>();
 
+	@Nullable
+	private HttpServletMapping httpServletMapping;
+
 
 	// ---------------------------------------------------------------------
 	// Constructors
@@ -1389,6 +1395,33 @@ public Collection<Part> getParts() throws IOException, ServletException {
 		return result;
 	}
 
+	public void setHttpServletMapping(@Nullable HttpServletMapping httpServletMapping) {
+		this.httpServletMapping = httpServletMapping;
+	}
+
+	@Override
+	public HttpServletMapping getHttpServletMapping() {
+		return (this.httpServletMapping == null ?
+				new MockHttpServletMapping("", "", "", determineMappingMatch()) :
+				this.httpServletMapping);
+	}
+
+	/**
+	 * Best effort to detect a Servlet path mapping, e.g. {@code "/foo/*"}, by
+	 * checking whether the length of requestURI > contextPath + servletPath.
+	 * This helps {@link org.springframework.web.util.ServletRequestPathUtils}
+	 * to take into account the Servlet path when parsing the requestURI.
+	 */
+	@Nullable
+	private MappingMatch determineMappingMatch() {
+		if (StringUtils.hasText(this.requestURI) && StringUtils.hasText(this.servletPath)) {
+			String path = UrlPathHelper.defaultInstance.getRequestUri(this);
+			String prefix = this.contextPath + this.servletPath;
+			return (path.startsWith(prefix) && (path.length() > prefix.length()) ? MappingMatch.PATH : null);
+		}
+		return null;
+	}
+
 	@Override
 	public <T extends HttpUpgradeHandler> T upgrade(Class<T> handlerClass) throws IOException, ServletException {
 		throw new UnsupportedOperationException();

spring-web/src/testFixtures/java/org/springframework/web/testfixture/servlet/MockHttpServletRequest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * 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.
@@ -57,6 +57,7 @@
 import jakarta.servlet.http.HttpServletResponse;
 import jakarta.servlet.http.HttpSession;
 import jakarta.servlet.http.HttpUpgradeHandler;
+import jakarta.servlet.http.MappingMatch;
 import jakarta.servlet.http.Part;
 
 import org.springframework.http.HttpHeaders;
@@ -70,6 +71,7 @@
 import org.springframework.util.ObjectUtils;
 import org.springframework.util.StreamUtils;
 import org.springframework.util.StringUtils;
+import org.springframework.web.util.UrlPathHelper;
 
 /**
  * Mock implementation of the {@link jakarta.servlet.http.HttpServletRequest} interface.
@@ -275,7 +277,8 @@ public class MockHttpServletRequest implements HttpServletRequest {
 
 	private final MultiValueMap<String, Part> parts = new LinkedMultiValueMap<>();
 
-	private HttpServletMapping httpServletMapping = new MockHttpServletMapping("", "", "", null);
+	@Nullable
+	private HttpServletMapping httpServletMapping;
 
 
 	// ---------------------------------------------------------------------
@@ -1392,13 +1395,31 @@ public Collection<Part> getParts() throws IOException, ServletException {
 		return result;
 	}
 
-	public void setHttpServletMapping(HttpServletMapping httpServletMapping) {
+	public void setHttpServletMapping(@Nullable HttpServletMapping httpServletMapping) {
 		this.httpServletMapping = httpServletMapping;
 	}
 
 	@Override
 	public HttpServletMapping getHttpServletMapping() {
-		return this.httpServletMapping;
+		return (this.httpServletMapping == null ?
+				new MockHttpServletMapping("", "", "", determineMappingMatch()) :
+				this.httpServletMapping);
+	}
+
+	/**
+	 * Best effort to detect a Servlet path mapping, e.g. {@code "/foo/*"}, by
+	 * checking whether the length of requestURI > contextPath + servletPath.
+	 * This helps {@link org.springframework.web.util.ServletRequestPathUtils}
+	 * to take into account the Servlet path when parsing the requestURI.
+	 */
+	@Nullable
+	private MappingMatch determineMappingMatch() {
+		if (StringUtils.hasText(this.requestURI) && StringUtils.hasText(this.servletPath)) {
+			String path = UrlPathHelper.defaultInstance.getRequestUri(this);
+			String prefix = this.contextPath + this.servletPath;
+			return (path.startsWith(prefix) && (path.length() > prefix.length()) ? MappingMatch.PATH : null);
+		}
+		return null;
 	}
 
 	@Override