Apex Test Data

Introduction to Apex Test Data

Testing in Apex is crucial for ensuring the reliability and integrity of your Salesforce applications. One of the key components of effective testing is creating isolated test data, which allows your tests to run independently of live data in your Salesforce org. This is where Test.createStub comes into play, providing the ability to create mock objects for unit testing.

What is Test.createStub?

The Test.createStub method in Apex allows developers to create a stub for an interface. This is particularly useful in testing scenarios where you want to isolate your test cases from the actual data or logic that may be present in your org. By using stubs, you can simulate responses and behaviors of objects, ensuring your tests focus solely on the logic being tested.

Creating a Stub with Test.createStub

To create a stub, you first need to define an interface in your Apex code. This interface will be implemented by a class that provides the actual logic. During testing, you will use Test.createStub to replace the implementation with a mock behavior. Here is a step-by-step guide:

Using Test.createStub in Tests

In your test class, you can create a stub for the MyService interface using Test.createStub. This allows you to control the behavior of the performAction method without executing the actual logic. Here's how you can do it:

Benefits of Using Stubs in Testing

Using stubs in your test cases provides several benefits:

• Isolation: Tests are decoupled from the actual logic and data, reducing dependencies.
• Control: You can simulate various scenarios and control the behavior of objects under test.
• Performance: Tests run faster as they do not rely on actual data processing.