How to map error in Combine
Issue #506 When a function expects AnyPublisher<[Book], Error> but in mock, we have Just func getBooks() -> AnyPublisher<[Book], Error> { return Just([ Book(id: "1", name: "Book 1"), Book(id: "2", name: "Book 2"), ]) .eraseToAnyPublisher() } There will be a mismatch, hence compile error Cannot convert return expression of type ‘AnyPublisher<[Book], Just.Failure>’ (aka ‘AnyPublisher<Array, Never>') to return type ‘AnyPublisher<[Book], Error>’ The reason is because Just produces Never, not Error. The workaround is to introduce Error...