Salesforce – Mock callouts in Apex

May 11th, 2021

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To mock callouts in Apex, you can create a class that implements the HttpCalloutMock interface. This allows you to define the desired response for an HTTP request made during testing. Here’s an example of how you can create a mock class for callouts:

   private class RestMock implements HttpCalloutMock {

        public HTTPResponse respond(HTTPRequest req) {
            HTTPResponse res = new HTTPResponse();
            res.setHeader('Content-Type', 'text/json');
            res.setBody('{}');
            res.setStatusCode(200);
            return res;
        }
    }

In your test method, you can use the Test.setMock method to associate your mock class with the HTTP callout. Here’s an example of how to use the mock in a test:

@isTest static void myTest() {
        Test.setMock(HttpCalloutMock.class, new RestMock());
        
        // Some stuff...

        Test.startTest();
        // Test-related stuff...
        Test.stopTest();
        
    }

By using this approach, you can simulate different scenarios and responses to ensure your code handles callouts correctly during testing.