Apex Mock Testing

Introduction to Apex Mock Testing

Apex mock testing is crucial for testing HTTP callouts in Salesforce. By using the HttpCalloutMock interface, developers can simulate responses from external services, enabling them to test callout logic without relying on actual external systems.

Why Use HttpCalloutMock?

The use of HttpCalloutMock provides several advantages:

• Isolation: Tests can run independently of external services.
• Consistency: Simulate the same response every time, ensuring repeatable tests.
• Control: Define expected responses and test various scenarios.

Implementing HttpCalloutMock

The HttpCalloutMock interface requires the implementation of the respond method. This method is used to generate a mock response for the HTTP callout.

Using Mock Responses in Tests

Once you have defined your mock response, you can use it in your test methods. Use the Test.setMock method to set your mock class before calling your code that performs the HTTP callout.

Best Practices for Mock Testing

• Always use mock callouts in your tests to avoid hitting external services.
• Test various scenarios by changing the response returned by your mock implementation.
• Ensure your test cases cover both successful and error responses to validate error handling in your code.