All You Need Is Lambdas: Java Tests Without a Mocking Framework

Most Java developers have written something like this. Maybe recently. @Test void should_categorize_new_transactions () { final var mockRepository = Mockito . mock ( CategorizedTransactionRepository . class ); final var mockMerchantDirectoryService = Mockito . mock ( MerchantDirectoryService . class ); final var categorizer = new TransactionCategorizer ( mockRepository , mockMerchantDirectoryService ); final var message = createSampleTransactionMessage (); Mockito . when ( mockMerchantDirectoryS