Fill out a fair bit of OpenAPI Entity testing

Sources/JSONAPIOpenAPI/OpenAPITypes+Codable.swift

@@ -110,7 +110,7 @@ extension JSONNode.ArrayContext: Encodable {
 	}
 }
 
-extension JSONNode.ObjectContext : Encodable{
+extension JSONNode.ObjectContext : Encodable {
 	private enum CodingKeys: String, CodingKey {
 		case maxProperties
 		case minProperties
@@ -132,13 +132,9 @@ extension JSONNode.ObjectContext : Encodable{
 			try container.encode(additionalProperties, forKey: .additionalProperties)
 		}
 
-		let required = properties.filter { (name, node) in
-			node.required
-		}.keys
+		try container.encode(requiredProperties, forKey: .required)
 
-		try container.encode(Array(required), forKey: .required)
-
-		try container.encode(max(minProperties, required.count), forKey: .minProperties)
+		try container.encode(minProperties, forKey: .minProperties)
 	}
 }
 

Sources/JSONAPIOpenAPI/OpenAPITypes.swift

@@ -371,7 +371,7 @@ public enum JSONNode: Equatable {
 
 	public struct ObjectContext: Equatable {
 		public let maxProperties: Int?
-		public let minProperties: Int
+		let _minProperties: Int
 		public let properties: [String: JSONNode]
 		public let additionalProperties: [String: JSONNode]?
 
@@ -379,8 +379,16 @@ public enum JSONNode: Equatable {
 		// NOTE that an object's required properties
 		// array is determined by looking at its properties'
 		// required Bool.
-		public let required: [String]
 		*/
+		public var requiredProperties: [String] {
+			return Array(properties.filter { (name, node) in
+				node.required
+			}.keys)
+		}
+
+		public var minProperties: Int {
+			return max(_minProperties, requiredProperties.count)
+		}
 
 		public init(properties: [String: JSONNode],
 					additionalProperties: [String: JSONNode]? = nil,
@@ -389,7 +397,7 @@ public enum JSONNode: Equatable {
 			self.properties = properties
 			self.additionalProperties = additionalProperties
 			self.maxProperties = maxProperties
-			self.minProperties = minProperties
+			self._minProperties = minProperties
 		}
 	}