niceStubExample.swift

class DatabaseStub: Database {    
  lazy var addUserAction = niceStub(of: addUser, thatReturns: true)  
  func addUser(name: String) -> Bool {     
    return addUserAction(name)    
  }
}
func testAddingUser_savesToDatabase () {
  // Act
  database.addUser(name: "user1") // ✅, doesn't crash
  ...
}