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Each test method in a test class is executed in a separate transaction. Although you'd be able to "see" a static variable in each test method in the sense that it would be defined, it'd always be null …

Yes, you can. Custom Metadata is considered, well, metadata, and it's available to query in an Apex unit test (unlike Custom Settings). It's important to bear in mind that this creates an external de …

Your class makes a callout after you perform DML. From Salesforce knowledge base: You can't make callouts, HTTP or otherwise, once you have made changes to the database. It's true that you cannot …

but the concern is with the connected app we can integrate with two orgs This is not accurate. When you perform an OAuth connection to a Salesforce org, you supply a Connected App to define who you …

This is a tricky subtlety that has to do with how asynchronous Apex is enqueued and executed in unit test context. I think your code probably works, but in the way you're testing it right now, you can …

This is pretty straightforward. Your code is designed to return a null value given an invalid response, and that's exactly what it's doing. Your test does this: Test.setMock(HttpCalloutMock.class, n …

Your mock appears to me to be correctly implemented, at a glance. The issue is that your assertion is failing, and it's failing for a pretty comprehensible reason. In your class that performs the cal …

Mocks do not replace the need to create and insert appropriate test data to ensure your code executes the logic path you are aiming to test. Here, your unit test code must create and insert a ExtCre …

do we need to check if an apex test is running before performing callout? Or does the Test.setMock() method automatically prevent callouts during a test run? You do not need to change your code unde …

Salesforce makes available two Mock interfaces (HttpCalloutMock, for REST calls, and WebServiceMock, for SOAP calls), as well as the StaticResourceCalloutMock and MultiStaticResourceCalloutMock implementations … these Trailhead modules: Apex REST Callouts Apex SOAP Callouts For more in-depth information, explore these sections in the Apex Developer Guide: Testing HTTP Callouts Test Web Service Callouts HttpCalloutMock …

Yes, you can, using either of two techniques. Your HttpCalloutMock's respond() method can inspect its inbound HttpRequest, and construct a different response based on which endpoint is being called, t …