Fix Windows flake in CommandChannelDecoderTest

surefire-booter/src/test/java/org/apache/maven/surefire/booter/spi/CommandChannelDecoderTest.java

@@ -25,7 +25,6 @@
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
-import java.nio.file.Path;
 import java.util.Random;
 import java.util.concurrent.ConcurrentLinkedQueue;
 
@@ -37,7 +36,6 @@
 import org.apache.maven.surefire.booter.ForkedNodeArg;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.io.TempDir;
 
 import static java.nio.channels.Channels.newChannel;
 import static java.nio.charset.StandardCharsets.UTF_8;
@@ -63,12 +61,13 @@
 public class CommandChannelDecoderTest {
     private static final Random RND = new Random();
 
-    @TempDir
-    Path tempFolder;
-
     @BeforeEach
     public void initTmpFile() {
-        File reportsDir = tempFolder.toFile();
+        // Not a JUnit @TempDir: the decoder writes .dumpstream files into this directory,
+        // and on Windows a freshly written file can be transiently locked (antivirus,
+        // indexer) right when the @TempDir cleanup runs, failing the whole test class
+        // with DirectoryNotEmptyException. target/ needs no post-test cleanup.
+        File reportsDir = new File("target", "decoder-dumps");
         String dumpFileName = "surefire-" + RND.nextLong();
         DumpErrorSingleton.getSingleton().init(reportsDir, dumpFileName);
     }