callback.onChunk("final content", true);
        assertEquals(4, events.size());
        assertEquals("chunk:final content:true", events.get(3));

        // Test onError
        callback.onError(ChatPhaseCallback.PHASE_SEARCH, "Search failed");
        assertEquals(5, events.size());
        assertEquals("error:search:Search failed", events.get(4));
    }

    @Test

    /**
     * Called when an error occurs during processing.
     *
     * @param phase the phase where the error occurred
     * @param error the error message
     */
    void onError(String phase, String error);

    /**
     * Returns a no-op callback implementation.
     *
     * @return a callback that does nothing
     */
    static ChatPhaseCallback noOp() {

     */
    void onChunk(String chunk, boolean done);

    /**
     * Called when an error occurs during streaming.
     *
     * @param error the error that occurred
     */
    default void onError(final Throwable error) {
        // Default implementation does nothing
    }

ction(a,b,c,d){var e=d[b]||"";a.errorMessageKey="",a.errorMessage=e.replace("%s",c)},f=function(c,d,e){var f=new FileReader,g=new Image;f.readAsDataURL(c),f.onload=function(c){g.onload=function(){a(b).trigger("imageValidation",[this]),d(this)},g.onerror=function(){e()},g.src=c.target.result}};a.formUtils.addValidator({name:"mime",validatorFunction:function(b,f,g,h){if(c){var i=!0,j=f.get(0).files||[],k="",l=d(f);return j.length&&(a.each(j,function(b,c){return i=!1,k=c.type||c.name.substring(c.na...