Verify run preview descendant cleanup

RuoYi-Vue/ruoyi-generator/src/test/java/com/ruoyi/generator/service/front/RunPreviewProcessRunnerTest.java

@@ -11,6 +11,7 @@ import java.nio.file.Files;
 import java.util.HashMap;
 import java.util.Map;
 
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
@@ -53,27 +54,38 @@ public class RunPreviewProcessRunnerTest
     }
 
     @Test
-    public void startCommandRecordsManagedWindowsProcessPid() throws Exception
+    public void stopManagedWindowsProcessTerminatesDescendantProcess() throws Exception
     {
         if (!isWindows())
         {
             return;
         }
         File projectDirectory = temporaryFolder.newFolder("managed-process");
+        File childPidFile = new File(projectDirectory, "child.pid");
         RunPreviewProcessRunner runner = new RunPreviewProcessRunner();
 
         Process process = runner.startCommandForTesting(
-                "ping 127.0.0.1 -n 3 > nul", projectDirectory, new HashMap<String, String>());
+                "powershell.exe -NoProfile -NonInteractive -Command "
+                        + "\"$PID | Set-Content -NoNewline child.pid; Start-Sleep -Seconds 30\"",
+                projectDirectory, new HashMap<String, String>());
+        long childPid = -1L;
 
         try
         {
             assertTrue(process instanceof ManagedPreviewProcess);
             assertTrue(((ManagedPreviewProcess) process).waitForRootPid(2000L) > 0L);
+            assertTrue(waitForFile(childPidFile, 2000L));
+            childPid = Long.parseLong(new String(
+                    Files.readAllBytes(childPidFile.toPath()), StandardCharsets.UTF_8).trim());
+            assertTrue(isWindowsProcessAlive(childPid));
         }
         finally
         {
             new RunPreviewProcessKiller().stop(process, null);
         }
+
+        assertFalse(process.isAlive());
+        assertFalse(isWindowsProcessAlive(childPid));
     }
 
     private File viteProject() throws IOException
@@ -99,6 +111,37 @@ public class RunPreviewProcessRunnerTest
         return nodeHome;
     }
 
+    private boolean waitForFile(File file, long timeoutMillis) throws InterruptedException
+    {
+        long deadline = System.currentTimeMillis() + timeoutMillis;
+        while (System.currentTimeMillis() < deadline)
+        {
+            if (file.isFile() && file.length() > 0L)
+            {
+                return true;
+            }
+            Thread.sleep(25L);
+        }
+        return file.isFile() && file.length() > 0L;
+    }
+
+    private boolean isWindowsProcessAlive(long pid) throws Exception
+    {
+        if (pid <= 0L)
+        {
+            return false;
+        }
+        Process check = new ProcessBuilder(
+                "powershell.exe",
+                "-NoProfile",
+                "-NonInteractive",
+                "-Command",
+                "if (Get-Process -Id " + pid + " -ErrorAction SilentlyContinue) { exit 0 } else { exit 1 }")
+                .redirectErrorStream(true)
+                .start();
+        return check.waitFor() == 0;
+    }
+
     private boolean isWindows()
     {
         String osName = System.getProperty("os.name");