Is writing a test class for an Apex REST class similar to other Apex classes?

Writing a test class for an Apex REST class is indeed similar to testing other Apex classes, as both involve using Salesforce's testing framework to verify functionality. Both types of tests require creating test methods that can execute the logic in the class and validate responses.

When testing an Apex REST class, developers use the same testing methodologies: setting up test data, invoking the REST methods, and checking assertions on the results. This includes sending HTTP requests and validating the responses as expected. Just like any other Apex class, proper coverage is essential, and employing techniques like mocking HTTP requests can also be implemented to simulate various scenarios.

The emphasis on methodologies being similar is significant because it reflects the consistency in the testing approach across different types of Apex code within Salesforce, reinforcing best practices in unit testing, including ensuring isolation and completeness of coverage.