In this episode, Paul talks to Ellen Shapiro about her approach to testing, Swift Package Manager, GraphQL, and more. Detailed topics: Productivity in uncertain times  Understanding Apollo GraphQL Is GraphQL only a query language or does it refer to an actual database? Killer features of GraphQL: code generation, flexibility, and efficiency How to integrate GraphQL with your app Is it possible to use GraphQL with an existing Core Data stack? How much work is it to migrate a server from REST to GraphQL? Ellen's recommendation on language for backend GraphQL A pragmatic approach to testing  UI testing breadth vs execution time How to add the first tests to a project Should you write tests as you go or all at the end? How do you write testable code? What things must be tested? Tips for swaying clients away from 100% test coverage How to keep testing coverage up over time Assertions and preconditions vs guard and fatal errors Using Swift Package Manager and CocoaPods instead of Carthage The SwiftPM team has been working on landing all current adoption blockers Why video is better than text to communicate Opinions on working from home What is Horror Scrolling? Should junior developers work remotely? How to get your first iOS Development job   What Ellen expects from this WWDC20