diff --git a/OpenVPN Adapter Tests/OpenVPNPrivateKeyTests.swift b/OpenVPN Adapter Tests/OpenVPNPrivateKeyTests.swift
new file mode 100644
index 0000000..ab45614
--- /dev/null
+++ b/OpenVPN Adapter Tests/OpenVPNPrivateKeyTests.swift	
@@ -0,0 +1,124 @@
+//
+//  OpenVPNPrivateKeyTests.swift
+//  OpenVPN Adapter
+//
+//  Created by Sergey Abramchuk on 07.09.17.
+//
+//
+
+import XCTest
+@testable import OpenVPNAdapter
+
+class OpenVPNPrivateKeyTests: XCTestCase {
+
+    override func setUp() {
+        super.setUp()
+        // Put setup code here. This method is called before the invocation of each test method in the class.
+    }
+    
+    override func tearDown() {
+        // Put teardown code here. This method is called after the invocation of each test method in the class.
+        super.tearDown()
+    }
+
+    func testKeyPEMandDERWithoutPassword() {
+        guard
+            let caURL = Bundle.current.url(forResource: "keyfile-decrypted", withExtension: "3des"),
+            let caOriginalPEMData = try? Data(contentsOf: caURL)
+        else {
+            XCTFail()
+            return
+        }
+        
+        let keyFromPEM: OpenVPNPrivateKey
+        do {
+            keyFromPEM = try OpenVPNPrivateKey(pem: caOriginalPEMData, password: nil)
+        } catch {
+            XCTFail("\(error)")
+            return
+        }
+        
+        XCTAssert(keyFromPEM.type == .RSA)
+        
+        let keyDERData: Data
+        do {
+            keyDERData = try keyFromPEM.derData()
+        } catch {
+            XCTFail("\(error)")
+            return
+        }
+        
+        let keyFromDER: OpenVPNPrivateKey
+        do {
+            keyFromDER = try OpenVPNPrivateKey(der: keyDERData, password: nil)
+        } catch {
+            XCTFail("\(error)")
+            return
+        }
+        
+        XCTAssert(keyFromDER.type == .RSA)
+        
+        let keyGeneratedPEMData: Data
+        do {
+            keyGeneratedPEMData = try keyFromDER.pemData()
+        } catch {
+            XCTFail("\(error)")
+            return
+        }
+        
+        XCTAssert(keyGeneratedPEMData.elementsEqual(caOriginalPEMData))
+    }
+    
+    func testKeyPEMandDERWithPassword() {
+        guard
+            let keyURL = Bundle.current.url(forResource: "keyfile-encrypted", withExtension: "3des"),
+            let keyOriginalPEMData = try? Data(contentsOf: keyURL)
+        else {
+            XCTFail()
+            return
+        }
+        
+        let keyFromPEM: OpenVPNPrivateKey
+        do {
+            keyFromPEM = try OpenVPNPrivateKey(pem: keyOriginalPEMData, password: "testkey")
+        } catch {
+            XCTFail("\(error)")
+            return
+        }
+        
+        let keyDERData: Data
+        do {
+            keyDERData = try keyFromPEM.derData()
+        } catch {
+            XCTFail("\(error)")
+            return
+        }
+        
+        let keyFromDER: OpenVPNPrivateKey
+        do {
+            keyFromDER = try OpenVPNPrivateKey(der: keyDERData, password: nil)
+        } catch {
+            XCTFail("\(error)")
+            return
+        }
+        
+        let keyGeneratedPEMData: Data
+        do {
+            keyGeneratedPEMData = try keyFromDER.pemData()
+        } catch {
+            XCTFail("\(error)")
+            return
+        }
+        
+        guard
+            let keySampleURL = Bundle.current.url(forResource: "keyfile-decrypted", withExtension: "3des"),
+            let keySamplePEMData = try? Data(contentsOf: keySampleURL)
+        else {
+            XCTFail()
+            return
+        }
+        
+        XCTAssert(keyGeneratedPEMData.elementsEqual(keySamplePEMData))
+    }
+
+}