// Test the getDocId logic without creating actual FilePurgeVisitor
        // The logic converts path to doc ID by removing path separators
        String pathStr = "_1/_2/docid123";
        String expectedDocId = "_1_2docid123";
        String actualDocId = pathStr.replace("/", "").replace("\\", "");
        assertEquals(expectedDocId, actualDocId);
    }

    // Test FilePurgeVisitor visitFileFailed
    @Test