Unit test support

SiaDrive.Api/SiaCurl.h

@@ -15,7 +15,8 @@ public:
 		ServerVersionMismatch,
 		InvalidRequiredVersion,
 		NoResponse,
-		Failed
+		InvalidRequestPath,
+		UnknownFailure
 	};
 
 public:
@@ -29,6 +30,9 @@ private:
 
 	Property(SiaHostConfig, HostConfig, public, public)
 
+private:
+	static _SiaCurlError CheckApiError(const json& result);
+
 private:
 	std::string ConstructPath(const String& relativePath) const;
 	_SiaCurlError _Get(const String& path, json& response) const;