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need help to wrote test class for below code

global class SendQuoteAsEmail 
    public static List <String> ToAddresses= New List<String>();

    webservice static string sendQuoteEmail(String OrderIdFromParam)
            System.debug('Order ID passed'+OrderIdFromParam);
            List<order> OrderDetailList = [select id, name,orderNumber,account.Billing_Owner__r.id,Client_Order_Owner__r.Email,Client_Order_Owner__r.id,Quote__c from Order where id=: OrderIdFromParam];
            List<order> orderId=new List<order>();
            //List<Order> ordersToUpdate=new List<Order>();
            List<Quote_Email__c> getCustomSettingValues= new List<Quote_Email__c>([select CC_Email_Address__c, From_Email_Address__c from Quote_Email__c limit 1]);
            String fromAddress= getCustomSettingValues.get(0).From_Email_Address__c ;
            //String[] ccaddress = new String[] {getCustomSettingValues.get(0).CC_Email_Address__c};
            OrgWideEmailAddress[] owea = [select Id from OrgWideEmailAddress where Address=:fromAddress];
            for(Order ord: OrderDetailList )
            system.debug('email ID:'+ToAddresses);
            Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
            PageReference pdf =  Page.QuoteDetailsPage;

            Blob b;
           // Take the PDF content

                b = pdf.getContent();
            // Create the email attachment
            Messaging.EmailFileAttachment efa = new Messaging.EmailFileAttachment();
            efa.setFileName(OrderDetailList[0].orderNumber+'-Quote-DiamondAir International.pdf');

             // Construct the list of emails we want to send
             List<Messaging.SingleEmailMessage> lstMsgs = new List<Messaging.SingleEmailMessage>();

             Messaging.SingleEmailMessage msg = new Messaging.SingleEmailMessage();
             email.setTemplateId( [select id from EmailTemplate where DeveloperName='Quote_Email_Template'].id );
             email.setToAddresses( ToAddresses);
             email.setFileAttachments(new Messaging.EmailFileAttachment[] {efa}); 

            String upsertOrder=null;
            String updateInvoice=null;
                List<order> OrderToUpdate= new List<Order>();
                for(order orderListVal: orderId)
                    datetime myDateTime = datetime.now();
                    string mydtstring = mydatetime.format();
                    orderListVal.Quote_status__c='Quote Sent to Client at '+myDateTime; 
                }//end of for
                    update OrderToUpdate;
                catch(Exception e)
                    return 'false';
                    List<Messaging.SendEmailResult> results=new List<Messaging.SendEmailResult>();
                        return 'true'; 
                       return 'false';
                    return 'false';
      }//end of try
      catch(Exception e)
          system.debug('Catch block'+e);
          return 'false';
      //end of catch  

    }//end of sendInvoiceEmail
}//end of class

Amit Chaudhary 8Amit Chaudhary 8
I will recommend you to start using trailhead to learn about test classes
1) https://trailhead.salesforce.com/modules/apex_testing

Also please check below post
1) https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_qs_test.htm
2) https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_testing_example.htm

sample Test classes
1) http://amitsalesforce.blogspot.com/2015/06/best-practice-for-test-classes-sample.html

Sample test class to start
public class SendQuoteAsEmailTest 
	static testMethod void myUniteTest(){
		// Create your test data here for quote object
		Order orderObj = new Order();
			// Add all required field
		insert orderObj;
			String orderid = orderObj.id;
		//Add Assert here	

Please follow below salesforce Best Practice for Test Classes :-

1. Test class must start with @isTest annotation if class class version is more than 25
2. Test environment support @testVisible , @testSetUp as well
3. Unit test is to test particular piece of code working properly or not .
4. Unit test method takes no argument ,commit no data to database ,send no email ,flagged with testMethod keyword .
5. To deploy to production at-least 75% code coverage is required
6. System.debug statement are not counted as a part of apex code limit.
7. Test method and test classes are not counted as a part of code limit
9. We should not focus on the  percentage of code coverage ,we should make sure that every use case should covered including positive, negative,bulk and single record .
Single Action -To verify that the the single record produces the correct an expected result .
Bulk action -Any apex record trigger ,class or extension must be invoked for 1-200 records .
Positive behavior : Test every expected behavior occurs through every expected permutation , i,e user filled out every correctly data and not go past the limit .
Negative Testcase :-Not to add future date , Not to specify negative amount.
Restricted User :-Test whether a user with restricted access used in your code .
10. Test class should be annotated with @isTest .
11 . @isTest annotation with test method  is equivalent to testMethod keyword .
12. Test method should static and no void return type .
13. Test class and method default access is private ,no matter to add access specifier .
14. classes with @isTest annotation can't be a interface or enum .
15. Test method code can't be invoked by non test request .
16. Stating with salesforce API 28.0 test method can not reside inside non test classes .
17. @Testvisible annotation to make visible private methods inside test classes.
18. Test method can not be used to test web-service call out . Please use call out mock .
19. You can't  send email from test method.
20.User, profile, organization, AsyncApexjob, Corntrigger, RecordType, ApexClass, ApexComponent ,ApexPage we can access without (seeAllData=true) .
21. SeeAllData=true will not work for API 23 version eailer .
22. Accessing static resource test records in test class e,g List<Account> accList=Test.loadData(Account,SobjectType,'ResourceName').
23. Create TestFactory class with @isTest annotation to exclude from organization code size limit .
24. @testSetup to create test records once in a method  and use in every test method in the test class .
25. We can run unit test by using Salesforce Standard UI,Force.com IDE ,Console ,API.
26. Maximum number of test classes run per 24 hour of period is  not grater of 500 or 10 multiplication of test classes of your organization.
27. As apex runs in system mode so the permission and record sharing are not taken into account . So we need to use system.runAs to enforce record sharing .
28. System.runAs will not enforce user permission or field level permission .
29. Every test to runAs count against the total number of DML issued in the process .

Let us know if this will help you
Hi@ amit
I from the above code i m getting only 15% of cde coverage

Amit Chaudhary 8Amit Chaudhary 8
Please create test data for order and Quote_Email__c object in your test class