public void testEraseSingleBlob() throws Exception {
   BlobVersion trx1 = store.newVersion("urn:test:trx1");
   Writer file = trx1.open("urn:test:file").openWriter();
   file.append("blob store test");
   file.close();
   trx1.commit();
   store.erase();
   assertEmpty(dir);
 }
 public void testEraseMultiVersionSingleBlob() throws Exception {
   Writer file = store.open("urn:test:file").openWriter();
   file.append("blob store test1");
   file.close();
   file = store.open("urn:test:file").openWriter();
   file.append("blob store test2");
   file.close();
   store.erase();
   assertEmpty(dir);
 }
 public void testEraseEmpty() throws Exception {
   store.erase();
   assertEmpty(dir);
 }
 public void tearDown() throws Exception {
   store.erase();
   dir.delete();
 }