Create a mock for "Route" entity for Unit Testing

'MapboxDirections.swift', '0.27.3'

I'm writing unit tests for a class that uses a dependency that should return at least one "Route" entity.

For the dependency class, I created a new class by subclassing, and on completion block I want to return a mock object for "Route", but during build time for unit tests I get those issues:

> :-1: Undefined symbol: type metadata accessor for MapboxDirections.Route
> :-1: Undefined symbol: MapboxDirections.Waypoint.__allocating_init(coordinate: __C.CLLocationCoordinate2D, coordinateAccuracy: Swift.Double, name: Swift.String?) -> MapboxDirections.Waypoint
> :-1: Undefined symbol: type metadata accessor for MapboxCoreNavigation.NavigationMatchOptions
> :-1: Undefined symbol: MapboxCoreNavigation.NavigationMatchOptions.__allocating_init(waypoints: [MapboxDirections.Waypoint], profileIdentifier: __C.MBDirectionsProfileIdentifier?) -> MapboxCoreNavigation.NavigationMatchOptions
> :-1: Undefined symbol: type metadata accessor for MapboxDirections.Waypoint
> :-1: Undefined symbol: _MBDirectionsProfileIdentifierAutomobile
> :-1: Undefined symbol: MapboxDirections.Directions.shared.unsafeMutableAddressor : MapboxDirections.Directions

Start with MapboxDirections.swift and the unit-test target to determine how Route, Waypoint, and NavigationMatchOptions are exposed for tests. Reproduce the listed undefined-symbol errors, then verify that a mock Route can be returned by a subclassed dependency and the unit-test target links successfully.

Written by the indexing model from the issue text.