Permanently deleting a folder does not delete versions of documents under it

package org.nuxeo.ecm.core.test;

import static org.junit.Assert.*;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.nuxeo.ecm.core.api.CoreSession;
import org.nuxeo.ecm.core.api.DocumentModel;
import org.nuxeo.ecm.core.api.DocumentModelList;
import org.nuxeo.ecm.core.api.DocumentRef;
import org.nuxeo.ecm.core.api.VersioningOption;
import org.nuxeo.ecm.core.event.EventService;
import org.nuxeo.ecm.core.versioning.VersioningService;
import org.nuxeo.ecm.platform.test.PlatformFeature;
import org.nuxeo.runtime.test.runner.Features;
import org.nuxeo.runtime.test.runner.FeaturesRunner;

import com.google.inject.Inject;

@RunWith(FeaturesRunner.class)
@Features({ PlatformFeature.class })
public class SUPNXP13808Test {

    @Inject
    protected CoreSession session;

    @Inject
    protected EventService eventService;

    @Test
    public void testSUPNXP13808_removeFile() {
        
        DocumentModel ws = session.createDocumentModel("Workspace");
        ws.setPathInfo("/", "ws");
        ws = session.createDocument(ws);
        // create a folder
        DocumentModel folder = session.createDocumentModel("Folder");
        folder.setPathInfo(ws.getPathAsString(), "folder");
        folder = session.createDocument(folder);
        // create a 'File' document
        DocumentModel file = session.createDocumentModel("File");
        file.setPathInfo(folder.getPathAsString(), "file");
        file = session.createDocument(file);
        DocumentRef fileRef = file.getRef();
        // add version to created document 
        file.setPropertyValue("dc:title", "a version");
        file.putContextData(VersioningService.VERSIONING_OPTION, VersioningOption.MINOR);
        file = session.saveDocument(file);

        DocumentModelList files = session.query("SELECT * FROM File");
        assertEquals(2, files.size());
        
        // delete 'File' document
        session.removeDocument(fileRef);
        session.save();
        eventService.waitForAsyncCompletion();
        files = session.query("SELECT * FROM File");
        assertEquals(0, files.size());
    }

    @Test
    public void testSUPNXP13808_removeFolder() {
        
        DocumentModel ws = session.createDocumentModel("Workspace");
        ws.setPathInfo("/", "ws");
        ws = session.createDocument(ws);
        // create a folder
        DocumentModel folder = session.createDocumentModel("Folder");
        folder.setPathInfo(ws.getPathAsString(), "folder");
        folder = session.createDocument(folder);
        // create a 'File' document
        DocumentModel file = session.createDocumentModel("File");
        file.setPathInfo(folder.getPathAsString(), "file");
        file = session.createDocument(file);
        // add version to created document 
        file.setPropertyValue("dc:title", "a version");
        file.putContextData(VersioningService.VERSIONING_OPTION, VersioningOption.MINOR);
        file = session.saveDocument(file);

        DocumentModelList files = session.query("SELECT * FROM File");
        assertEquals(2, files.size());
        
        // delete 'Folder' document
        session.removeDocument(folder.getRef());
        session.save();
        eventService.waitForAsyncCompletion();
        files = session.query("SELECT * FROM File");
        assertEquals(0, files.size());
    }

}