HI Everyone,

I was writing test class for batch apex i was written all ways but still i was in 18% code coveagre if anyone help me to reach 100% coverage.

Batch Apex:

public class UserRegistrationStatusUpdate implements Database.Batchable<sObject> {
    
    public UserRegistrationStatusUpdate() {}

    public Database.QueryLocator start(Database.BatchableContext BC) {
        System.debug('UserRegistrationStatusUpdate start');
        if (Label.User_RegistrationCheck_TimeInHours == '-1') {
            return Database.getQueryLocator([Select Id, AccountID__c, Email__c, External_Parent_Id__c from Hub_Parent__c Where Product_Status__c = 'Active' and Registration_Completed_Date__c != null]);
        }
        else {
            Datetime registrationStartDay = Datetime.now().addHours(-Integer.valueOf(Label.user_RegistrationCheck_TimeInHours));
            return Database.getQueryLocator([Select Id, AccountID__c, Email__c, External_Parent_Id__c from Hub_Parent__c Where Product_Status__c = 'Active' and Registration_Completed_Date__c != null and Registration_Completed_Date__c >= :registrationStartDay]);
        }
    }
    
    public void execute(Database.BatchableContext BC, List<Hub_Parent__c> ParentList) {
        try {
            System.debug('userRegistrationStatusUpdate execute count ' + ParentList.size());
            List<user__c> userToUpdateList = new List<user__c>();
            List<user__c> userList;
            String emailHashed;
            String memberIDHashed;
            Blob b;
            for (Hub_Parent__c Parent : ParentList) {
                b = Crypto.generateDigest('SHA-256', Blob.valueOf(Parent.Email__c.toLowerCase()));
                emailHashed = EncodingUtil.base64Encode(b);
                
                userList = [Select Id, Registered_User__c from user__c Where AccountID__c = :Parent.AccountID__c and Eligibility_User__c = false and EmailHashed__c = :emailHashed Limit 1];
                if (userList.size() > 0) {
                    if (userList[0].Registered_User__c == false) {
                        userList[0].Registered_User__c = true;
                        userToUpdateList.add(userList[0]);
                    }
                }
                else {
                    if (Parent.External_Parent_Id__c != null) {
                        b = Crypto.generateDigest('SHA-256', Blob.valueOf(Parent.External_Parent_Id__c.toLowerCase()));
                        memberIDHashed = EncodingUtil.base64Encode(b);
                        userList = [Select Id, Registered_User__c from user__c Where AccountID__c = :Parent.AccountID__c and Eligibility_User__c = false and Registered_User__c = false and MemberIDHashed__c = :memberIDHashed Limit 1];
                        if (userList.size() > 0) {
                            userList[0].Registered_User__c = true;
                            userToUpdateList.add(userList[0]);
                        }
                    }
                }
            }
            if (userToUpdateList.size() > 0) {
                update userToUpdateList;
            }
        } catch (Exception ex) {
            System.debug('userRegistrationStatusUpdate Exception :' + ex.getMessage());
        }
    }
    
    public void finish(Database.BatchableContext BC) {}
}

Test Class for above Batch Apex:

@isTest
public class UserRegistrationStatusUpdateTest {
    static testMethod void testUserRegistrationStatusUpdate(){
        
        Test.startTest();
        
        TestController.createCustomSettings();
        TestController.createEnviornmentSettings();
        Hub_Parent__c pt = TestController.getMockParentObject();
        List<User__c> User = new List<User__c>();
        User__c U= new User__c();
        U.FirstName__c = 'nMM';
        U.LastName__c = 'MMM';
        U.Gender__c = 'Male';
        U.Email__c = pt.Email__c;
        Blob b = Crypto.generateDigest('SHA-256', Blob.valueOf(U.Email__c.toLowerCase()));
        U.EmailHashed__c = EncodingUtil.base64Encode(b);
        U.DOB__c = system.today();
        U.Member_ID__c = '10755633045998625107';
        Blob b1 = Crypto.generateDigest('SHA-256', Blob.valueOf(U.Member_ID__c.toLowerCase()));
        U.MemberIDHashed__c = EncodingUtil.base64Encode(b1);
        U.AccountID__c = pt.AccountID__c;
        
        insert U;
        
        
        UserRegistrationStatusUpdate obj = new UserRegistrationStatusUpdate();
        DataBase.executeBatch(obj);
        
        Test.stopTest();
    }
}

Thanks InAdvance.