Note: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.
IntegrationTest Annotation (Developer Preview)
A class annotated with @IntegrationTest can only contain integration test methods and @TearDown methods. You can't mix @IntegrationTest and @IsTest annotations on the same class.
Integration test methods cannot be called from non-test contexts or from @IsTest test methods. However, integration tests can call methods in @IsTest utility classes, for example, shared test data factories.