Test encoding and Unicode normalization for scanned resources

This commit introduces tests which serve as "regression tests" for the
behavior of PathMatchingResourcePatternResolver in Spring Framework
5.3.x with regard to URL-encoding and Unicode normalization of resource
paths.

Specifically, the new tests demonstrate that resource paths do NOT need
to be decoded or normalized in 5.3.x.

See gh-29243

spring-core/src/test/java/example/japanese/バリューオブジェクト/バリューオブジェクト.java

@@ -0,0 +1,26 @@
+/*
+ * 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 example.japanese.バリューオブジェクト;
+
+/**
+ * This class and its package exist in order to test encoding and Unicode
+ * normalization for resource paths discovered via classpath scanning.
+ *
+ * <p>"バリューオブジェクト" is Japanese for "value object".
+ */
+public class バリューオブジェクト {
+}

spring-core/src/test/java/org/springframework/core/io/support/PathMatchingResourcePatternResolverTests.java

@@ -105,6 +105,30 @@ class PathMatchingResourcePatternResolverTests {
 
 		}
 
+		@Nested
+		class ContainingJapaneseCharactersInTheirPathsAndFileNames {
+
+			@Test
+			void usingClasspathStarProtocol() {
+				String pattern = "classpath*:example/japanese/バリューオブジェクト/**/*.class";
+				String pathPrefix = ".+example/japanese/";
+
+				assertExactFilenames(pattern, "バリューオブジェクト.class");
+				assertExactSubPaths(pattern, pathPrefix, "バリューオブジェクト/バリューオブジェクト.class");
+			}
+
+			@Test
+			void usingFilePrototol() {
+				Path testResourcesDir = Paths.get("src/test/resources").toAbsolutePath();
+				String pattern = String.format("file:%s/japanese-resources/バリューオブジェクト/**/*.text", testResourcesDir);
+				String pathPrefix = ".+japanese-resources/";
+
+				assertExactFilenames(pattern, "バリューオブジェクト.text");
+				assertExactSubPaths(pattern, pathPrefix, "バリューオブジェクト/バリューオブジェクト.text");
+			}
+
+		}
+
 	}
 
 
@@ -181,4 +205,27 @@ class PathMatchingResourcePatternResolverTests {
 		}
 	}
 
+	private void assertExactSubPaths(String pattern, String pathPrefix, String... subPaths) {
+		try {
+			Resource[] resources = resolver.getResources(pattern);
+			List<String> actualSubPaths = Arrays.stream(resources)
+					.map(resource -> getPath(resource).replaceFirst(pathPrefix, ""))
+					.sorted()
+					.collect(Collectors.toList());
+			assertThat(actualSubPaths).containsExactlyInAnyOrder(subPaths);
+		}
+		catch (IOException ex) {
+			throw new UncheckedIOException(ex);
+		}
+	}
+
+	private String getPath(Resource resource) {
+		try {
+			return resource.getURL().getPath();
+		}
+		catch (IOException ex) {
+			throw new UncheckedIOException(ex);
+		}
+	}
+
 }