Custom Metadata Type in VF Controller

Custom Metadata Type in VF Controller

//Controller by Jessie Rymph included with unmanaged package Unsubscribe Link from AppExchange & Salesforce Labs.
//the controller tells the visualforce page jrsl_ul_UnsubscribeFinish to display text if a custom metadata type says "Yes" to a confirmation email
//April 9, 2021

public without sharing class jrsl_ul_UnsubscribeController {  
    private final jrsl_ul_Unsubscribe_Link__mdt uLmDt;  
    public string displayText {get; set;}
    public boolean booly {get; set;}
        
    public jrsl_ul_UnsubscribeController(){
        
        //query for the unsubscribe link custom metadata type with the masterlabel "unsubscribe".
        try{
        uLmDt = [SELECT jrsl_ul_Send_Confirmation_Email__c
                 FROM jrsl_ul_Unsubscribe_Link__mdt 
                 WHERE MasterLabel = 'Unsubscribe'];
        
        if (uLmDt.jrsl_ul_Send_Confirmation_Email__c=='Yes')
        {
            booly = true;
            displayText ='Thank you. You have successfully unsubscribed. You will receive a confirmation email shortly.';
            system.debug('The confirmation email is turned on.');
        }
        
       //if the Send confirmation email field is set to no or none, include no additional text on the VF page. 
        else 
        {displayText = 'Thank you. You have successfully unsubscribed.';
         booly = false;
         system.debug('The confirmation email is turned off.');
        }
        
        }
        catch(Exception e) {
                System.debug('The cmdt jrsl_ul_Unsubscribe_Link__mdt is missing a record whose masterlabel is Unsubscribe. Here is the error:' + e.getMessage());
        		displayText= 'ERROR: There is an error with the Unsubscribe Link package. The Custom Metadata Type jrsl_ul_Unsubscribe_Link__mdt is missing a record whose masterlabel is Unsubscribe.';    
        
        }
    }
}

Test

//test by Jessie Rymph included with unmanaged package Unsubscribe Link from AppExchange & Salesforce Labs.
// April 13, 2021

@isTest
public class jrsl_ul_UnsubscribeControllerTest {
    
    
    @isTest public static void testMyController () {
        
        Test.startTest();
        system.debug('If the test fails with the error "List has no rows for assignment to SObject", then you are missing a Custom Metadatatype of Unsubscribe Link with MasterLabel Unsubscribe. This is for the unmanaged package Unsubscribe Link.');   
        //Look for Custom Metadata Type
        jrsl_ul_Unsubscribe_Link__mdt uLmDt = [SELECT jrsl_ul_Send_Confirmation_Email__c
                                               FROM jrsl_ul_Unsubscribe_Link__mdt 
                                               WHERE MasterLabel = 'Unsubscribe'];
        
        //instantiate the controller
        jrsl_ul_UnsubscribeController controller = new jrsl_ul_UnsubscribeController();
        
        //If the boolean is true, then display that they will receive an email.
        IF(controller.booly== true)
        {system.assertEquals('Thank you. You have successfully unsubscribed. You will receive a confirmation email shortly.',
                             controller.displayText);
         system.debug('The unsubscribe cmdt is set to yes, send the email. So the visualforce page says you will receive a confirmation email shortly');
        }    
        else if (controller.booly == false)
            //If the boolean is set to false, do not mention the email.
        {system.assertEquals('Thank you. You have successfully unsubscribed.',
                             controller.displayText);
         system.debug('The unsubscribe cmdt is set to no, do not send the email. So no text appears about the email.');} 
        else 
            //Otherwise, display an error to show that the Unsubscribe Link mdt is missing.
        {system.assertEquals('ERROR: There is an error with the Unsubscribe Link package. The Custom Metadata Type jrsl_ul_Unsubscribe_Link__mdt is missing a record whose masterlabel is Unsubscribe.', controller.displayText);}
        
        test.stopTest();
    }
    
}

VF Page

<!-- by Jessie Rymph included with unmanaged package Unsubscribe Link from AppExchange & Salesforce Labs.-->
<!-- April 9, 2021-->
<!-- The custom controller adds additional text if the organization wants to send a confirmation email.-->
<!-- The Unsubscribe Link flow finishes at this page.-->

<apex:page controller="jrsl_ul_UnsubscribeController" showHeader="false" applyHtmlTag="true" applyBodyTag="false" standardStylesheets="false" lightningStylesheets="true">
<p></p>
<apex:pageMessages ></apex:pageMessages>
<span style="font-family: Arial Unicode MS; text-align:center; font-size: 14pt;">{!displayText} 
    </span>
    </apex:page>