Added a ResourceReader that can retrieve test resource files in nested locations

src/main/java/emissary/util/io/GreedyResourceReader.java

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+package emissary.util.io;
+
+import org.apache.commons.io.FilenameUtils;
+import org.apache.commons.lang3.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static org.apache.commons.lang3.StringUtils.isNotBlank;
+import static org.apache.commons.lang3.StringUtils.substringBeforeLast;
+
+/**
+ * A {@link ResourceReader} extended to find data files based purely on their location, ignoring the default naming
+ * convention used by the {@link ResourceReader#findDataResourcesFor(Class)} method.
+ * <p>
+ * This class is primarily used to find payload files for Identification tests that can benefit from more
+ * content-representative file names.
+ * </p>
+ */
+public class GreedyResourceReader extends ResourceReader {
+    private static final Logger logger = LoggerFactory.getLogger(GreedyResourceReader.class);
+
+    public static final String PAYLOADS_FOLDER = "payloads";
+    public static final String ANSWERS_FOLDER = "answers";
+
+    public static final Predicate<String> IS_XML_FILE = filename -> "xml".equals(FilenameUtils.getExtension(filename));
+
+    /**
+     * Returns the project-relative paths of test files for the specified test class. The files should be underneath a
+     * "payloads" subdirectory of the test class directory. Additional subdirectories can exist within the payloads
+     * directory itself, and any files found within will be included in the results.
+     * 
+     * @param c test class for which to perform the search
+     * @return list of project-relative test file paths
+     */
+    public List<String> findAllPayloadFilesFor(Class<?> c) {
+        URL url = this.which(c);
+        if (url == null || !url.getProtocol().equals("file")) {
+            return Collections.emptyList();
+        }
+
+        List<String> results = new ArrayList<>(findAllFilesUnderClassNameSubDir(c, url, PAYLOADS_FOLDER));
+        Collections.sort(results);
+        return results;
+    }
+
+    /**
+     * Returns the project-relative paths of test files for the specified test class. The files should be underneath a
+     * "payloads" subdirectory of the test class directory. Additional subdirectories can exist within the payloads
+     * directory itself, and any files found within will be included in the results.
+     *
+     * @param c test class for which to perform the search
+     * @return list of project-relative test file paths
+     */
+    public List<String> findAllAnswerFilesFor(Class<?> c) {
+        URL url = this.which(c);
+        if (url == null || !url.getProtocol().equals("file")) {
+            return Collections.emptyList();
+        }
+
+        List<String> results = findAllFilesUnderClassNameSubDir(c, url, ANSWERS_FOLDER, IS_XML_FILE);
+        Collections.sort(results);
+        return results;
+    }
+
+    /**
+     * Finds all files beneath the specified subdirectory of the test class resource folder
+     *
+     * @param c test class for which the resource files exist
+     * @param url location from which the classLoader looded the test class
+     * @param subDirName subdirectory that contains the files
+     * @return List of test resource file paths
+     */
+    private List<String> findAllFilesUnderClassNameSubDir(Class<?> c, URL url, final String subDirName) {
+        return findAllFilesUnderClassNameSubDir(c, url, subDirName, StringUtils::isNotBlank);
+    }
+
+    /**
+     * Finds the files beneath a given test class resource folder, filtered by a provided {@link Predicate<String>}
+     *
+     * @param c test class for which the resource files exist
+     * @param url location from which the classLoader loaded the test class
+     * @param subDirName subdirectory that contains the files
+     * @param fileFilter Predicate used to filter the list of discovered files
+     * @return List of test resource file paths
+     */
+    private List<String> findAllFilesUnderClassNameSubDir(Class<?> c, URL url, final String subDirName, final Predicate<String> fileFilter) {
+        String classNameInPathFormat = getResourceName(c);
+        Path subDir = Path.of(getFullPathOfTestClassResourceFolder(url, c), subDirName);
+        File testClassDir = subDir.toFile();
+        if (testClassDir.exists() && testClassDir.isDirectory()) {
+            try (Stream<Path> theList = Files.walk(testClassDir.toPath())) {
+                return theList.filter(Files::isRegularFile)
+                        .map(testClassDir.toPath()::relativize)
+                        .map(filePath -> classNameInPathFormat + "/" + subDirName + "/" + filePath)
+                        .filter(fileFilter::test)
+                        .collect(Collectors.toList());
+
+            } catch (IOException e) {
+                logger.debug("Failed to retrieve files for class {}", c.getName(), e);
+            }
+        }
+
+        return Collections.emptyList();
+    }
+
+    /**
+     * Gets the absolute path of a test class runtime resource folder
+     * 
+     * @param url URL from which the ClassLoader loaded the test class
+     * @param c test class
+     * @return test class folder path
+     */
+    protected String getFullPathOfTestClassResourceFolder(URL url, Class<?> c) {
+        String classNameInPathFormat = getResourceName(c);
+        if (url.getPath().contains(CLASS_SUFFIX)) {
+            // return the URL minus the ".class" suffix
+            return StringUtils.substringBeforeLast(url.getPath(), CLASS_SUFFIX);
+        }
+
+        return StringUtils.join(url.getPath(), "/", classNameInPathFormat);
+    }
+}

src/test/java/emissary/util/io/GreedyResourceReaderTest.java

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+package emissary.util.io;
+
+import emissary.test.core.junit5.UnitTest;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Path;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+
+public class GreedyResourceReaderTest extends UnitTest {
+
+
+    @Test
+    void testPayloadFileLocation() {
+
+        // files in the "payloads" subdirectory should be found as resources
+        List<String> testFileNames = Arrays.asList("payloads/File1.txt", "payloads/subdir/sample.md");
+        // Non-payload.txt is in the test class directory, but not beneath its "payloads" subdirectory
+        final String NON_PAYLOAD = "Non-payload.txt";
+
+        GreedyResourceReader grr = new GreedyResourceReader();
+        String testClassDir = grr.getResourceName(this.getClass());
+
+        List<String> resources = grr.findAllPayloadFilesFor(this.getClass());
+        assertNotNull(resources, "Resources must not be null");
+        assertEquals(testFileNames.size(), resources.size(), "All data resources not found");
+
+        testFileNames.stream()
+                .map(t -> Path.of(testClassDir, t))
+                .forEach(p -> assertTrue(resources.contains(p.toString())));
+
+        assertFalse(resources.contains(Path.of(testClassDir, NON_PAYLOAD).toString()));
+
+        for (String rez : resources) {
+            try (InputStream is = grr.getResourceAsStream(rez)) {
+                assertNotNull(is, "Failed to open " + rez);
+            } catch (IOException e) {
+                fail("Failed to open " + rez, e);
+            }
+        }
+    }
+
+
+    @Test
+    void testAnswerFileLocation() {
+
+        // files in the "payloads" subdirectory should be found as resources
+        List<String> testAnswerFileNames = Arrays.asList("answers/File1.txt.xml", "answers/subdir/sample.md.xml");
+
+        // files that should NOT be detected as "answer" files based on their locations
+        List<String> misplacedAnswerFileNames = Arrays.asList("Non-answer.xml", "answers/README");
+
+        GreedyResourceReader grr = new GreedyResourceReader();
+        String testClassDir = grr.getResourceName(this.getClass());
+
+        List<String> answerFiles = grr.findAllAnswerFilesFor(this.getClass());
+        assertNotNull(answerFiles, "Resources must not be null");
+        assertEquals(testAnswerFileNames.size(), answerFiles.size(), "Not all answer files not found");
+
+        testAnswerFileNames.stream()
+                .map(t -> Path.of(testClassDir, t))
+                .forEach(p -> assertTrue(answerFiles.contains(p.toString())));
+
+        misplacedAnswerFileNames.stream()
+                .map(t -> Path.of(testClassDir, t))
+                .forEach(p -> assertFalse(answerFiles.contains(p.toString())));
+
+
+        for (String file : answerFiles) {
+            try (InputStream is = grr.getResourceAsStream(file)) {
+                assertNotNull(is, "Failed to open " + file);
+            } catch (IOException e) {
+                fail("Failed to open " + file, e);
+            }
+        }
+    }
+}

src/test/resources/emissary/util/io/GreedyResourceReaderTest/Non-answer.xml

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+<root>file is in wrong directory</root>

src/test/resources/emissary/util/io/GreedyResourceReaderTest/Non-payload.txt

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+ignore me

src/test/resources/emissary/util/io/GreedyResourceReaderTest/answers/File1.txt.xml

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+<root>ignore the file content</root>

src/test/resources/emissary/util/io/GreedyResourceReaderTest/answers/README

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+not an answer file

src/test/resources/emissary/util/io/GreedyResourceReaderTest/answers/subdir/sample.md.xml

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+<root>ignore the file content</root>

src/test/resources/emissary/util/io/GreedyResourceReaderTest/payloads/File1.txt

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+Ignore the content

src/test/resources/emissary/util/io/GreedyResourceReaderTest/payloads/subdir/sample.md

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+## this is a sample file