Mocking ArcGIS Data

mmoosbac94

Is there a way to mock ArcGIS data types in Swift, such as Layer or IdentifyLayerResult? These types don’t expose public initializers, which makes direct instantiation difficult. However, for unit testing purposes, it's sometimes necessary to inject these objects.

Do you have any recommendations for how to handle this?

Thank you!
Marvin

 

MarkDostal

Mocking of types isn't as easy in Swift as it is in other languages like Java or Kotlin. Really the only way is to create a protocol that represents the type you want to mock and then extend the ArcGIS type to conform to that protocol, and also add a mock type that conforms to that protocol. But then you must deal with programming to that interface (protocol) wherever you need that type. It can become quite cumbersome.

Note that this isn't a Maps SDK types issue, it's a Swift issue. The best we know how to do is to create protocols. After all, Apple doesn't provide ways to mock Foundation types, etc.