move file instead of splitting in classes when all classes in file are moved (IDEA-66437)

java/java-tests/testData/refactoring/moveClassAndFile/allClassesInFile/after/t/MyClass.java

@@ -1,5 +1,3 @@
 package t;
-
 class MyClass{}
-
 class MyOneMoreClass{}

java/java-tests/testData/refactoring/movePackageAsDir/multipleClassesInOneFile/after/src1/target/pack1/S1.java

@@ -8,4 +8,4 @@ class S11{}
 
 class S12{}
 
-class S13{}
+class S13{}

java/java-tests/testSrc/com/intellij/refactoring/MovePackageAsDirectoryTest.java

@@ -8,10 +8,14 @@ import com.intellij.openapi.roots.ContentEntry;
 import com.intellij.openapi.roots.ModifiableRootModel;
 import com.intellij.openapi.roots.ModuleRootManager;
 import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.openapi.vfs.VirtualFileAdapter;
+import com.intellij.openapi.vfs.VirtualFileEvent;
+import com.intellij.openapi.vfs.VirtualFileManager;
 import com.intellij.psi.JavaPsiFacade;
 import com.intellij.psi.PsiDirectory;
 import com.intellij.psi.PsiPackage;
 import com.intellij.refactoring.move.moveClassesOrPackages.MoveDirectoryWithClassesProcessor;
+import junit.framework.Assert;
 
 import java.util.Arrays;
 import java.util.Comparator;
@@ -37,7 +41,21 @@ public class MovePackageAsDirectoryTest extends MultiFileTestCase {
   }
 
   public void testMultipleClassesInOneFile() throws Exception {
-    doTest(createAction("pack1", "target"));
+    final boolean [] fileWasDeleted = new boolean[]{false};
+    final VirtualFileAdapter fileAdapter = new VirtualFileAdapter() {
+      @Override
+      public void fileDeleted(VirtualFileEvent event) {
+        fileWasDeleted[0] = !event.getFile().isDirectory();
+      }
+    };
+    VirtualFileManager.getInstance().addVirtualFileListener(fileAdapter);
+    try {
+      doTest(createAction("pack1", "target"));
+    }
+    finally {
+      VirtualFileManager.getInstance().removeVirtualFileListener(fileAdapter);
+    }
+    Assert.assertFalse("Deleted instead of moved", fileWasDeleted[0]);
   }