Debug indexingRescanOnOverflow test

Author: sungshik

src/main/java/engineering/swat/watch/impl/overflows/IndexingRescanner.java

@@ -52,6 +52,7 @@ public class IndexingRescanner extends MemorylessRescanner {
     public IndexingRescanner(Executor exec, Path path, WatchScope scope) {
         super(exec);
         new Indexer(path, scope).walkFileTree(); // Make an initial scan to populate the index
+        System.out.println("Initial scan done");
     }
 
     private class Indexer extends BaseFileVisitor {
@@ -149,6 +150,7 @@ public void accept(EventHandlingWatch watch, WatchEvent event) {
                 try {
                     var lastModifiedTimeNew = Files.getLastModifiedTime(fullPath);
                     var lastModifiedTimeOld = index.put(fullPath, lastModifiedTimeNew);
+                    System.out.println("Index of " + event.getRelativePath() + " updated from " + lastModifiedTimeOld + " to " + lastModifiedTimeNew);
 
                     // If a `MODIFIED` event happens for a path that wasn't in
                     // the index yet, then a `CREATED` event has somehow been

src/test/java/engineering/swat/watch/SingleDirectoryTests.java

@@ -232,6 +232,7 @@ public void execute(Runnable command) {
         try (var watch = watchConfig.start()) {
             // At this point, the index of last-modified-times inside `watch` is
             // populated with initial values.
+            System.out.println("Performing IO...");
 
             Files.writeString(directory.resolve("a.txt"), "foo");
             Files.writeString(directory.resolve("b.txt"), "bar");
@@ -250,8 +251,8 @@ public void execute(Runnable command) {
 
             var overflow = new WatchEvent(WatchEvent.Kind.OVERFLOW, directory);
             ((EventHandlingWatch) watch).handleEvent(overflow);
-            System.out.println("------------");
             Thread.sleep(TestHelper.NORMAL_WAIT.toMillis());
+            System.out.println("------------");
             // At this point, the current thread has presumably slept long
             // enough for the `OVERFLOW` event to have been handled by the
             // rescanner. This means that synthetic events must have been issued