Hi all,

I am struggling with coding a test class for a class accessing custom metadata class.
The class tries to insert a record for a custom metadata type, but no idea if my code is going to somewhere. I could not find any concrete solution for my problem. Some say you need a wrapper class, some say JSON.

I would appreciate any guidance, help as I am not a developer myself, but unfortunately all developers are busy at the moment.

This is my class:
 

global class EmailReminder implements Schedulable {  
    
   global void execute(SchedulableContext SC) {
      sendEmail();
   }
    
    
    global void sendEmail(){

        Messaging.reserveSingleEmailCapacity(2);
        
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        
        // Strings to hold the email addresses to which you are sending the email.
        
        Email_Reminder_Setting__mdt query = [SELECT Subject__c, OWA_Label__c, Body__c ,ToEmailAddress__c FROM Email_Reminder_Setting__mdt LIMIT 1];
        
        String[] toEmailAddress = new String[] {query.ToEmailAddress__c};
        String Subject = query.Subject__c;
        String Body= query.Body__c;
        String Owa_Label= query.OWA_Label__c;
       
        
        // Assign the addresses for the To and CC lists to the mail object.
        
        mail.setToAddresses(toEmailAddress);
        
        // Use Organization Wide Address  
        for(OrgWideEmailAddress owa : [select id, Address, Displayname from OrgWideEmailAddress]) {
            if(owa.DisplayName.contains(Owa_Label)) {
                 mail.setOrgWideEmailAddressId(owa.id); 
            }
              
        } 
           
        // Specify the subject line for your email address.
        mail.setSubject(Subject);
        
        // Set to True if you want to BCC yourself on the email.
        mail.setBccSender(false);
        
        // Optionally append the salesforce.com email signature to the email.
        // The email address of the user executing the Apex Code will be used.
        mail.setUseSignature(false);
        
        // Specify the text content of the email.
        //mail.setPlainTextBody('Please configure this');
        
        mail.setHtmlBody(Body);
        
        // Send the email you have created.
    Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
    }
}

This is my test class so far:
 

@isTest
public class EmailReminder_Test {
   
  
      @testVisible static List<Email_Reminder__mdt> customMetadata { 
      get {
        if ( customMetadata == null )
            customMetadata = [ SELECT ToEmailAddress__c, OWA_Label__c, Subject__c, Body__c FROM Email_Reminder__mdt ]; 
            return customMetadata;
      } 
      set; }
      
      Test.startTest();
      EmailReminder sendEmailJob = new EmailReminder();
      String sch = '00 30 20 5 2 ? *';
      system.schedule('sendEmailJob', sch, sendEmailJob);
      Test.stopTest();
    
    
    
}

I am getting the error:

Error: Compile Error: Expecting ')' but was: 'sendEmailJob' at line 16 column 23​​​​​​​

What am I doing wrong?.