Solve issue on generating production and sandbox urls

SwiftyOpenPay/SwiftyOpenPay.swift

@@ -8,10 +8,6 @@
 
 public let OpenPayErrorDomain = "com.openpay.ios.lib"
 
-private let api_url           = "https://api.openpay.mx/"
-private let sandbox_api_url   = "https://sandbox-api.openpay.mx/"
-private let api_version       = "v1"
-
 extension SwiftyOpenPay.Error: CustomStringConvertible {
     public var description: String {
         switch self {
@@ -21,6 +17,18 @@ extension SwiftyOpenPay.Error: CustomStringConvertible {
 }
 
 public struct SwiftyOpenPay {
+    // MARK: - Internal declarations
+    internal static let api_url           = "https://api.openpay.mx/"
+    internal static let sandbox_api_url   = "https://sandbox-api.openpay.mx/"
+    internal static let api_version       = "v1"
+
+    internal var URLBase: String {
+        let base = sandboxMode ? SwiftyOpenPay.sandbox_api_url : SwiftyOpenPay.api_url
+
+        return base + SwiftyOpenPay.api_version + "/" + merchantId + "/"
+    }
+
+
     // MARK: - SwiftyOpenPay supporting data types
     public struct Configuration {
         public let merchantId: String
@@ -56,12 +64,6 @@ public struct SwiftyOpenPay {
     // MARK: - Private Properties
     private static let internalQueue = OperationQueue()
 
-    private var URLBase: String {
-        let base = sandboxMode ? api_url : sandbox_api_url
-
-        return base + api_version + "/" + merchantId + "/"
-    }
-
 
     // MARK: - Public Properties
     public let merchantId: String

SwiftyOpenPayTests/SwiftyOpenPayTests.swift

@@ -32,7 +32,7 @@ class SwiftyOpenPaytests: XCTestCase {
             ]
         ]
 
-        guard let token = buildToken(Token.self, data: response) else {
+        guard let _ = buildToken(Token.self, data: response) else {
             assertionFailure("Could not build token")
             return
         }
@@ -41,4 +41,20 @@ class SwiftyOpenPaytests: XCTestCase {
     func buildToken<T: JSONParselable>(type: T.Type, data: [String:AnyObject]) -> T? {
         return T.withData(data)
     }
+
+    func testSandboxMode() {
+        let op = SwiftyOpenPay(merchantId: "MyMerchantId", apiKey: "MyAPIKey", sandboxMode: true)
+
+        let sandboxUrl = SwiftyOpenPay.sandbox_api_url + SwiftyOpenPay.api_version + "/" + op.merchantId + "/"
+
+        assert(sandboxUrl == op.URLBase)
+    }
+
+    func testProdMode() {
+        let op = SwiftyOpenPay(merchantId: "MyMerchantId", apiKey: "MyAPIKey")
+
+        let productionUrl = SwiftyOpenPay.api_url + SwiftyOpenPay.api_version + "/" + op.merchantId + "/"
+
+        assert(productionUrl == op.URLBase)
+    }
 }