Unit of work is a pattern to handle the transaction during data manipulation using repository pattern. So we can say according to Martin Fowler, Maintains a list of objects affected by a business transaction and coordinates the writing out of changes and the resolution of concurrency problem.
Implementing these patterns can help insulate the application from changes in the data store and also gives advantages to automate unit testing. Though, these patterns are widely used for DDD but it facilitate for TDD also.
