We are attempting to move a simple Apex Class and Apex Test Class from Sandbox to Production, and blocked by Code Coverage Failure error. Our Code Coverage is showing 100% in Production (via Developer Console), yet we are seeing a Code Coverage Failure Error (coverage = 33%) even on "Validate" (not "Deploy") of non-apex change set. We have followed instructions in Knowledge Article 000335222 (https://help.salesforce.com/articleView?id=000335222&type=1&mode=1) carefully to reset Code Coverage numbers and are still seeing the above error on validation of non-apex change set as well as on attempt to deploy an apex-loaded change set including test class. Apex Class and Apex Test Class code below for reference, any help greatly appreciated!
 

Public class AutoConvertLeads
{
    @InvocableMethod
    public static void LeadAssign(List<Lead> LeadIds)
    {
        LeadStatus CLeadStatus= [SELECT Id, MasterLabel FROM LeadStatus WHERE IsConverted=true Limit 1];
        List<Database.LeadConvert> MassLeadconvert = new List<Database.LeadConvert>();
        for(Lead currentlead: LeadIds){
                Account[] matchedaccount = [SELECT Id, Name FROM Account WHERE Name=:currentlead.Company LIMIT 1];
                if(matchedaccount.size() > 0) {
                Database.LeadConvert Leadconvert = new Database.LeadConvert();
                Leadconvert.setLeadId(currentlead.id);                
                Leadconvert.setConvertedStatus(CLeadStatus.MasterLabel);
                Leadconvert.setDoNotCreateOpportunity(TRUE); //Remove this line if you want to create an opportunity from Lead Conversion
                Leadconvert.setAccountId(matchedaccount[0].id);
                MassLeadconvert.add(Leadconvert);
                }
        }
        
        if (!MassLeadconvert.isEmpty()) {
            List<Database.LeadConvertResult> lcr = Database.convertLead(MassLeadconvert);
        }
    }
}

And Test Class:

@isTest 
      public class TestAutoConvertLeads{
      static void createnewlead(){
      User userToCreate = [SELECT id FROM user WHERE profile.name='System Administrator' Limit 1];
      
      Test.startTest();    
      Lead leadToCreate =new Lead();
      List<Lead> LeadIds= New List<Lead>();
      leadToCreate.ownerid= userToCreate.id;
      leadToCreate.LastName ='Gupta';
      leadToCreate.Company='Salesforce';
      insert leadToCreate; 
      LeadIds.add(leadToCreate);
      
      LeadStatus CLeadStatus = new LeadStatus();
      
      Account AccountToCreate = new Account();
      AccountToCreate.ownerid= userToCreate.id;
      AccountToCreate.Name = 'Salesforce';
      insert AccountToCreate; 
      
      AutoConvertLeads.LeadAssign(LeadIds);
      
      Test.stopTest();
   }
}

 

We are attempting to move a simple Apex Class and Apex Test Class from Sandbox to Production, and blocked by Code Coverage Failure error. Our Code Coverage is showing 100% in Production (via Developer Console), yet we are seeing a Code Coverage Failure Error (coverage = 33%) even on "Validate" (not "Deploy") of non-apex change set. We have followed instructions in Knowledge Article 000335222 (https://help.salesforce.com/articleView?id=000335222&type=1&mode=1) carefully to reset Code Coverage numbers and are still seeing the above error on validation of non-apex change set as well as on attempt to deploy an apex-loaded change set including test class. Apex Class and Apex Test Class code below for reference, any help greatly appreciated!
 

Public class AutoConvertLeads
{
    @InvocableMethod
    public static void LeadAssign(List<Lead> LeadIds)
    {
        LeadStatus CLeadStatus= [SELECT Id, MasterLabel FROM LeadStatus WHERE IsConverted=true Limit 1];
        List<Database.LeadConvert> MassLeadconvert = new List<Database.LeadConvert>();
        for(Lead currentlead: LeadIds){
                Account[] matchedaccount = [SELECT Id, Name FROM Account WHERE Name=:currentlead.Company LIMIT 1];
                if(matchedaccount.size() > 0) {
                Database.LeadConvert Leadconvert = new Database.LeadConvert();
                Leadconvert.setLeadId(currentlead.id);                
                Leadconvert.setConvertedStatus(CLeadStatus.MasterLabel);
                Leadconvert.setDoNotCreateOpportunity(TRUE); //Remove this line if you want to create an opportunity from Lead Conversion
                Leadconvert.setAccountId(matchedaccount[0].id);
                MassLeadconvert.add(Leadconvert);
                }
        }
        
        if (!MassLeadconvert.isEmpty()) {
            List<Database.LeadConvertResult> lcr = Database.convertLead(MassLeadconvert);
        }
    }
}

And Test Class:

@isTest 
      public class TestAutoConvertLeads{
      static void createnewlead(){
      User userToCreate = [SELECT id FROM user WHERE profile.name='System Administrator' Limit 1];
      
      Test.startTest();    
      Lead leadToCreate =new Lead();
      List<Lead> LeadIds= New List<Lead>();
      leadToCreate.ownerid= userToCreate.id;
      leadToCreate.LastName ='Gupta';
      leadToCreate.Company='Salesforce';
      insert leadToCreate; 
      LeadIds.add(leadToCreate);
      
      LeadStatus CLeadStatus = new LeadStatus();
      
      Account AccountToCreate = new Account();
      AccountToCreate.ownerid= userToCreate.id;
      AccountToCreate.Name = 'Salesforce';
      insert AccountToCreate; 
      
      AutoConvertLeads.LeadAssign(LeadIds);
      
      Test.stopTest();
   }
}