What does the @Suites annotation require for all test classes in the suite?

The @Suites annotation in Guidewire requires that all test classes included in the suite are based on the same class type. This stipulation ensures that the tests can be compatible with each other, sharing a common structure and behaviors, making it easier to manage and run the suite collectively. By enforcing this requirement, it promotes consistency in the execution of tests and helps in organizing test classes that function similarly, enabling more straightforward maintenance and better results aggregation.

While other attributes mentioned in the alternatives have their relevance in testing practices, they do not pertain to the specific requirement dictated by the use of the @Suites annotation. For instance, unique string identifiers and the variety in class types may be necessary aspects in broader testing frameworks or scenarios, but they do not fulfill the core requirement posed by the @Suites annotation within Guidewire’s framework. Similarly, specifying only one test case does not align with the functional grouping that @Suites aims to achieve, as it is meant to group multiple related test cases together.