Updated unit tests

Author: colemancda

Tests/CoreModelTests/TestModel.swift

@@ -199,7 +199,7 @@ public struct Campground: Equatable, Hashable, Codable, Identifiable {
 public extension Campground {
 
     /// Campground Amenities
-    enum Amenity: String, Codable, CaseIterable {
+    enum Amenity: String, Codable, CaseIterable, Sendable {
 
         case water
         case amp30
@@ -256,7 +256,7 @@ extension Array: AttributeDecodable where Self.Element == Campground.Amenity  {
 public extension Campground {
 
     /// Location Coordinates
-    struct LocationCoordinates: Equatable, Hashable, Codable {
+    struct LocationCoordinates: Equatable, Hashable, Codable, Sendable {
 
         /// Latitude
         public var latitude: Double
@@ -297,7 +297,7 @@ extension Campground.LocationCoordinates: AttributeDecodable {
 public extension Campground {
 
     /// Schedule (e.g. Check in, Check Out)
-    struct Schedule: Equatable, Hashable, Codable {
+    struct Schedule: Equatable, Hashable, Codable, Sendable {
 
         public var start: UInt