fix: report generation used wrong paths for the output files

The regression was introduced in
  f5518e3
  "chore: remove the use of commons-io and commons-text"

getNameWithoutExtension returns the file name without the parent path.

Author: vlsi

src/core/src/main/java/org/apache/jmeter/report/dashboard/TemplateVisitor.java

@@ -104,7 +104,14 @@ public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
             // Process template file
             String templatePath = relativePath.toString();
             Template template = configuration.getTemplate(templatePath);
-            Path newPath = target.resolve(PathsKt.getNameWithoutExtension(relativePath));
+            Path newPath = target;
+            // getNameWithoutExtension returns the file name without the parent folder,
+            // so we resolve the parent first, and then add the file name without extension
+            Path newRelativeParent = relativePath.getParent();
+            if (newRelativeParent != null) {
+                newPath = newPath.resolve(newRelativeParent);
+            }
+            newPath = newPath.resolve(PathsKt.getNameWithoutExtension(relativePath));
             try (FileOutputStream stream = new FileOutputStream(newPath.toString());
                     Writer writer = new OutputStreamWriter(stream, StandardCharsets.UTF_8);
                     BufferedWriter bufferedWriter = new BufferedWriter(writer)){

src/dist-check/src/test/kotlin/org/apache/jmeter/gui/action/HtmlReportGeneratorTest.kt

@@ -36,6 +36,24 @@ class HtmlReportGeneratorTest : JMeterTestCase() {
 
     data class CheckArgumentsCase(val csvPath: String, val userPropertiesPath: String, val outputDirectoryPath: String, val expected: List<String>)
 
+    /**
+     * Assert that a file exists at the given path relative to a base directory
+     */
+    private fun assertFileExists(baseDir: File, relativePath: String, message: String? = null) {
+        val file = File(baseDir, relativePath)
+        val errorMessage = message ?: "$relativePath should exist"
+        assert(file.exists()) { errorMessage }
+    }
+
+    /**
+     * Assert that a file does NOT exist at the given path relative to a base directory
+     */
+    private fun assertFileNotExists(baseDir: File, relativePath: String, message: String? = null) {
+        val file = File(baseDir, relativePath)
+        val errorMessage = message ?: "$relativePath should NOT exist"
+        assert(!file.exists()) { errorMessage }
+    }
+
     companion object {
         /**
          * Combine the given path parts to one path with the correct path separator of the current platform.
@@ -141,4 +159,42 @@ class HtmlReportGeneratorTest : JMeterTestCase() {
             fail("First result message should contain '$expectedError', but was '$firstMessage'")
         }
     }
+
+    @Test
+    fun `report generation creates correct directory structure for HTML and JS files`() {
+        val htmlReportGenerator = HtmlReportGenerator(
+            combine("testfiles", "HTMLReportTestFile.csv"),
+            combine("user.properties"),
+            testDirectory.toString()
+        )
+        htmlReportGenerator.run()
+
+        // Verify directory structure exists
+        assertFileExists(testDirectory, "content")
+        assertFileExists(testDirectory, "content/pages")
+        assertFileExists(testDirectory, "content/js")
+
+        // Verify HTML pages are in correct location (content/pages/)
+        assertFileExists(testDirectory, "content/pages/OverTime.html")
+        assertFileExists(testDirectory, "content/pages/ResponseTimes.html")
+        assertFileExists(testDirectory, "content/pages/Throughput.html")
+        assertFileExists(testDirectory, "content/pages/CustomsGraphs.html")
+
+        // Verify JavaScript files are in correct location (content/js/)
+        assertFileExists(testDirectory, "content/js/dashboard.js")
+        assertFileExists(testDirectory, "content/js/graph.js")
+        assertFileExists(testDirectory, "content/js/dashboard-commons.js")
+        assertFileExists(testDirectory, "content/js/customGraph.js")
+
+        // Verify files are NOT at root level (catches the bug!)
+        assertFileNotExists(testDirectory, "OverTime.html", "OverTime.html should NOT be at root level")
+        assertFileNotExists(testDirectory, "ResponseTimes.html", "ResponseTimes.html should NOT be at root level")
+        assertFileNotExists(testDirectory, "Throughput.html", "Throughput.html should NOT be at root level")
+        assertFileNotExists(testDirectory, "CustomsGraphs.html", "CustomsGraphs.html should NOT be at root level")
+        assertFileNotExists(testDirectory, "dashboard.js", "dashboard.js should NOT be at root level")
+        assertFileNotExists(testDirectory, "graph.js", "graph.js should NOT be at root level")
+
+        // Verify index.html is at root (this should be correct)
+        assertFileExists(testDirectory, "index.html", "index.html should exist at root level")
+    }
 }