added keychain unit test

GMERemittanceTests/KeychainText.swift

@@ -0,0 +1,60 @@
+//
+//  KeychainText.swift
+//  GMERemittanceTests
+//
+//  Created by InKwon Devik Kim on 08/04/2019.
+//  Copyright © 2019 Gobal Money Express Co. Ltd. All rights reserved.
+//
+
+import XCTest
+import KeychainAccess
+
+class KeychainText: XCTestCase {
+    func testSave(){
+        let keychain = Keychain(service: "com.gme.gmeremit")
+        do {
+            try keychain.set("4D544B3169614D6E6565546C6531724B6F734B6C0FCFCE14CF10F24A3BCAB8A101931F230FCFCE14CF10F24A3BCAB8A101931F230FCFCE14CF10F24A3BCAB8A101931F230FCFCE14CF10F24A3BCAB8A101931F230FCFCE14CF10F24A3BCAB8A101931F230FCFCE14CF10F24A3BCAB8A101931F23", key: "encryptedPassword")
+        }
+        catch let error {
+            print(error)
+        }
+    }
+    
+    func testGet(){
+        let keychain = Keychain(service: "com.gme.gmeremit")
+        do {
+            let pw = try keychain.get("encryptedPassword")
+            XCTAssert(pw == "4D544B3169614D6E6565546C6531724B6F734B6C0FCFCE14CF10F24A3BCAB8A101931F230FCFCE14CF10F24A3BCAB8A101931F230FCFCE14CF10F24A3BCAB8A101931F230FCFCE14CF10F24A3BCAB8A101931F230FCFCE14CF10F24A3BCAB8A101931F230FCFCE14CF10F24A3BCAB8A101931F23")
+        }
+        catch let error {
+            XCTAssert(false, error.localizedDescription)
+        }
+    }
+    
+    func testUpdate(){
+        let keychain = Keychain(service: "com.gme.gmeremit")
+        do {
+            try keychain.set("Test Encrypted Password", key: "encryptedPassword")
+            let pw = try keychain.get("encryptedPassword")
+            
+            XCTAssert(pw == "Test Encrypted Password")
+        }
+        catch let error {
+            XCTAssert(false, error.localizedDescription)
+        }
+    }
+    
+    func testRemove() {
+        let keychain = Keychain(service: "com.gme.gmeremit")
+        do {
+            try keychain.remove("encryptedPassword")
+            let pw = try keychain.get("encryptedPassword")
+            
+            XCTAssert(pw == nil)
+        }
+        catch let error {
+            XCTAssert(false, error.localizedDescription)
+        }
+    }
+
+}