Add mocks

AmplifyPlugins/Auth/Tests/AWSCognitoAuthPluginUnitTests/Mocks/MockURLSessionClient.swift

@@ -0,0 +1,31 @@
+//
+// Copyright Amazon.com Inc. or its affiliates.
+// All Rights Reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+import Foundation
+@testable import AWSCognitoAuthPlugin
+
+class MockURLSessionClient: URLSessionClientBehavior {
+
+    public var cancelAndResetCallCount = 0
+    public var dataForURLRequestCallCount = 0
+    public var dataForURLCallCount = 0
+
+    func cancelAndReset() async {
+        cancelAndResetCallCount += 1
+    }
+
+    func data(for request: URLRequest, delegate: (URLSessionTaskDelegate)?) async throws -> (Data, URLResponse) {
+        dataForURLRequestCallCount += 1
+        return (Data(), HTTPURLResponse())
+    }
+
+    func data(from url: URL, delegate: (URLSessionTaskDelegate)?) async throws -> (Data, URLResponse) {
+        dataForURLCallCount += 1
+        return (Data(), HTTPURLResponse())
+    }
+
+}