UpdateLabelJob job = new UpdateLabelJob();
        assertNotNull(job);
        assertNull(job.queryBuilder);
    }

    // Test processing documents with various URL conditions
    public void test_execute_variousUrlConditions() {
        String result = updateLabelJob.execute();
        assertNotNull(result);
        // The mock returns a fixed count of 3
        assertTrue(result.contains("docs"));
    }