During the execution of a method to clear all data in the mock persistent container, I encountered an error: The error occurred with the following code: To resolve this, I modified the fetch requests to use explicit entity names instead of using the entity class directly: By switching from EntityA.fetchRequest() to NSFetchRequest(entityName: “EntityA”), the issue … Read more

The Issue When running unit tests for a Core Data-based iOS application, you might encounter a warning like this: This warning indicates that Core Data has detected multiple entity descriptions claiming to represent the same managed object subclass. This often occurs when both the application and the test environment load the Core Data model, leading … Read more