pointfreeco/swift-issue-reporting 0.3.0 on GitHub

Added XCTUnimplemented, a function for constructing "unimplemented" closures that call XCTFail when invoked.

Helpful for stubbing dependencies held in value types. For example, a common use of XCTest Dynamic Overlay:

struct FactClient {
  var fetch: (Int) async throws -> String
}

extension FactClient {
  struct Unimplemented: Error {
    let endpoint: String
  }

  static let unimplemented = Self(
    fetch: { _ in
      XCTFail("Unimplemented: \(Self.self).fetch")
      throw Unimplemented(endpoint: "\(Self.self).fetch")
    }
  )
}

Can be simplified using XCTUnimplemented:

extension FactClient {
  static let unimplemented = Self(
    fetch: XCTUnimplemented("\(Self.self).fetch")
  )
}

Changed: XCTFail now causes a runtime warning when called outside of tests.