Hi everyone, I am not a developer and am running into issues when deploying my Apex Class into Production. When I deploy it says that my Code Coverage is 0%. Hoping someone here can help me.

Here is my Apex Class: 

global class ExternalCalloutHelperV2 { 
    //@future(callout=true)
    public static string post(String endpoint, String jsonBody ) {
        System.debug('ExternalCalloutHelper::post');
        //System.debug('ExternalCalloutHelper::post is disabled in sandbox.');
        //return '';
        HttpRequest req = new HttpRequest();
        //req.setEndpoint(xxx + endpoint);
        req.setEndpoint('xxx'); // FOR TESTING ONLY
        req.setMethod('POST');

        req.setbody(EncodingUtil.urlEncode(jsonBody, 'UTF-8'));
         
        // Specify the required user name and password to access the endpoint
        // As well as the header information
        
        String username = 'voices_api';
        String password = 'voiced_dot_com_api_pass';
        
        Blob headerValue = Blob.valueOf(username + ':' + password);
        String authorizationHeader = 'BASIC ' +
        EncodingUtil.base64Encode(headerValue);
        req.setHeader('Authorization', authorizationHeader);
        
        // Create a new http object to send the request object
        // A response object is generated as a result of the request  
        Http http = new Http();
        HTTPResponse res = http.send(req);
        return res.getBody();
    }
    
    @future(callout=true)
    public static void postContactToServer(id [] contactIds) {
        for (Integer i = 0; i<contactIds.size(); i++) {
            id contactId = contactIds[i];
        
            Contact contactObj;
            Account accountObj;
            User ownerObj;
            
            Organization organizationObj = [SELECT id, Name FROM Organization];
            contactObj = [SELECT AccountId, Account_Number__c, Fax, Phone, Id, Email, FirstName, Terms_of_Service_Privacy_Policy_Opt_in__c, Marketing_Communications_Opt_in__c,
                          LastName,MailingCity, MailingCountry, MailingState, MailingStreet, MailingPostalCode, OwnerId, Owner_ID__c, Username__c, CAG_Opt_in__c, Beta_Group_Opt_In__c FROM Contact
                          where Contact.Id = :contactId];
            
            try {
                accountObj = [SELECT Fax, Id, Name, AccountNumber, Phone, BillingCity, BillingCountry, Billing_Instructions__c, BillingState, BillingStreet, BillingPostalCode, OwnerId FROM Account
                              Where Account.Id = :contactObj.AccountId];            
            } catch (Exception accountError) {
                // accountObj is null
            }
    
            try {
                ownerObj = [SELECT AccountId,ContactId,Email,FirstName, Name, LastName, Phone, Extension, ProfileId, Title, UserRoleId, Id, Username FROM User
                            Where User.Id = :contactObj.OwnerId];
            } catch (Exception owberError) {
                // ownerObj is null
            }
            
            Map<String, SObject> postMap = new Map<String, SObject>();
            
            postMap.put('organization', organizationObj);
            postMap.put('contact', contactObj);
            postMap.put('account', accountObj);
            postMap.put('owner', ownerObj);
            
            //System.debug(postMap);
            String postBodyJSON = JSON.serialize(postMap);
            ExternalCalloutHelper.post('contact_update', postBodyJSON);
        }
    }
    
     webService static string createWebAccount(Id contactId) {
    Contact contactObj;
        Account accountObj;
        User ownerObj;
        //Contact ownerContactObj;
        
        Organization organizationObj = [SELECT id, Name FROM Organization];
        contactObj = [SELECT Pending_Server_Update__c, AccountId, Account_Number__c, Fax, Phone, Id, Email, FirstName, Terms_of_Service_Privacy_Policy_Opt_in__c, Marketing_Communications_Opt_in__c,
                          LastName,MailingCity, MailingCountry, MailingState, MailingStreet, MailingPostalCode, OwnerId, Owner_ID__c, Username__c, CAG_Opt_in__c, Beta_Group_Opt_In__c FROM Contact
                      where Contact.Id = :contactId];
        
        try {
      accountObj = [SELECT Fax, Id, Name, AccountNumber, Phone, BillingCity, BillingCountry, Billing_Instructions__c, BillingState, BillingStreet, BillingPostalCode, OwnerId FROM Account
                          Where Account.Id = :contactObj.AccountId];            
        } catch (Exception accountError) {
            // accountObj is null
        }

        try {
          ownerObj = [SELECT AccountId,ContactId,Email,FirstName, Name, LastName, Title, Phone, Extension, ProfileId, UserRoleId, Id, Username FROM User
                        Where User.Id = :contactObj.OwnerId];
        } catch (Exception owberError) {
            // ownerObj is null
        }
        
         
             
        Map<String, SObject> postMap = new Map<String, SObject>();
        
        postMap.put('organization', organizationObj);
        postMap.put('contact', contactObj);
        postMap.put('account', accountObj);
        postMap.put('owner', ownerObj);
         
        //System.debug(postMap);
        String postBodyJSON = JSON.serialize(postMap);
         
        return ExternalCalloutHelper.post('create_account', postBodyJSON);
         
    }

}


My Test Class is: 

@isTest
private class ExternalCalloutHelperV2_Test{
  @testSetup
  static void setupTestData(){
    test.startTest();
    Account account_Obj = new Account(Name = 'Name142', BillingStreet = 'PratapNagar', BillingCity = 'Jaipur', BillingState = 'Raj', BillingPostalCode = '302022', BillingCountry = 'India', Phone = '54343-58789');
    Insert account_Obj; 
    Contact contact_Obj = new Contact(LastName = 'LastName149', FirstName = 'First505', MailingStreet = 'PratapNagar', MailingCity = 'Jaipur', MailingState = 'Raj', MailingPostalCode = '302022', MailingCountry = 'India', Phone = '54343-99290', Fax = '54343-58413', Email = 'Email38@test.com', Username__c = 'Usern790', Terms_of_Service_Privacy_Policy_Opt_in__c = false, Marketing_Communications_Opt_in__c = false);
    Insert contact_Obj; 
    test.stopTest();
  }
  static testMethod void test_post_UseCase1(){
    List<Account> account_Obj  =  [SELECT Name,BillingStreet,BillingCity,BillingState,BillingPostalCode,BillingCountry,Phone from Account];
    System.assertEquals(true,account_Obj.size()>0);
    List<Contact> contact_Obj  =  [SELECT LastName,FirstName,MailingStreet,MailingCity,MailingState,MailingPostalCode,MailingCountry,Phone,Fax,Email,Username__c,Terms_of_Service_Privacy_Policy_Opt_in__c,Marketing_Communications_Opt_in__c,CAG_Opt_in__c from Contact];
    System.assertEquals(true,contact_Obj.size()>0);
    ExternalCalloutHelperV2 obj01 = new ExternalCalloutHelperV2();
    ExternalCalloutHelperV2.post('test data','test data');
  }
  static testMethod void test_postContactToServer_UseCase1(){
    List<Account> account_Obj  =  [SELECT Name,BillingStreet,BillingCity,BillingState,BillingPostalCode,BillingCountry,Phone from Account];
    System.assertEquals(true,account_Obj.size()>0);
    List<Contact> contact_Obj  =  [SELECT LastName,FirstName,MailingStreet,MailingCity,MailingState,MailingPostalCode,MailingCountry,Phone,Fax,Email,Username__c,Terms_of_Service_Privacy_Policy_Opt_in__c,Marketing_Communications_Opt_in__c from Contact];
    System.assertEquals(true,contact_Obj.size()>0);
    ExternalCalloutHelperV2 obj01 = new ExternalCalloutHelperV2();
    ExternalCalloutHelperV2.postContactToServer(new List<id>());
  }
}