long originalExpiry = purgeThumbnailJob.getExpiry();
        PurgeThumbnailJob result = purgeThumbnailJob.expiry(0);

        // Test method chaining
        assertSame(purgeThumbnailJob, result);
        // Test value was not changed
        assertEquals(originalExpiry, purgeThumbnailJob.getExpiry());
    }

    // Test expiry setter with negative value (should not change)
    @Test

{"index":{"_index":"fess_config.scheduled_job","_id":"thumbnail_purger"}}
{"name":"Thumbnail Purger","target":"all","cronExpression":"0 0 * * *","scriptType":"groovy","scriptData":"return container.getComponent(\"purgeThumbnailJob\").expiry(30 * 24 * 60 * 60 * 1000L).execute();","jobLogging":true,"crawler":false,"available":true,"sortOrder":7,"createdBy":"system","createdTime":0,"updatedBy":"system","updatedTime":0}

	</component>
	<component name="generateThumbnailJob" class="org.codelibs.fess.job.GenerateThumbnailJob" instance="prototype">
	</component>
	<component name="purgeThumbnailJob" class="org.codelibs.fess.job.PurgeThumbnailJob" instance="prototype">
	</component>
	<component name="updateLabelJob" class="org.codelibs.fess.job.UpdateLabelJob" instance="prototype">
	</component>