According to Scrum principles, what must be included in the concept of "Done"?

In Scrum, the concept of "Done" refers to a shared understanding within the Scrum Team of what needs to be completed for a Product Backlog item to be considered finished. One of the critical aspects of this is ensuring that quality is maintained throughout the development process. Including testing in the definition of "Done" signifies that the functionality has not only been developed but also verified to work as intended, meeting the necessary quality standards. This helps prevent technical debt and ensures that delivered items are usable and provide value.

Ensuring quality through testing plays an essential role in delivering working increments of the product. By emphasizing testing, the Scrum Team can reduce the risk of defects and issues in production and deliver functionality that meets or exceeds stakeholder expectations. This practice aligns with the principles of incrementally delivering value and maintaining a sustainable pace of work, making it an essential part of the definition of "Done."