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How to write a test class for a Web service

Hi,

Can anyone please guide me as to how do we write the test class for a Web Service.

Thanks.
Ajay Nagar 7Ajay Nagar 7
Go through these links :
https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_callouts_wsdl2apex_testing.htm
https://developer.salesforce.com/forums/?id=906F00000008z4VIAQ
Amit Chaudhary 8Amit Chaudhary 8
Please check below trailhead module for all webservice related qun.
1) https://developer.salesforce.com/trailhead/module/apex_integration_services?utm_campaign=trailhead&utm_source=sfdc&utm_medium=chatter-success

Apex Integration Overview
https://developer.salesforce.com/trailhead/apex_integration_services/apex_integration_callouts
This module will Describe the differences between web service and HTTP callouts and Authorize an external site with remote site settings


Apex REST Callouts
https://developer.salesforce.com/trailhead/apex_integration_services/apex_integration_rest_callouts
This module will  describe about Perform a callout to receive data from an external service and Test callouts by using mock callouts 

Apex SOAP Callouts
https://developer.salesforce.com/trailhead/apex_integration_services/apex_integration_soap_callouts
This module will describe you about Generate Apex classes using WSDL2Apex and  Perform a callout to send data to an external service using SOAP with Test callouts by using mock callouts


Apex Web Services
https://developer.salesforce.com/trailhead/apex_integration_services/apex_integration_webservices
This module will Describe the two types of Apex web services and provide a high-level overview of these services. Create an Apex REST class that contains methods for each HTTP method and Invoke a custom Apex REST method with an endpoint

NOTE:- Test class example ith Mock classes also given in above module

Let us know if this will help u