     // Measure the performance of encrypting/decrypting 10 strings
     // and then make sure the results are expected
     func testEncryptionDecryptionPerformance() {
-        let testData = self.generatePerformanceTestData()
+        let testData = self.generatePerformanceTestData(15)
         var results = [(raw: String, encrypted: String?, decrypted: String?)]()
         
         // Measure performance of encrypting & decrypting 10 strings

        XCTAssertEqual(testData, decrypted!)
    }
    
    func generatePerformanceTestData(length: Int = 10) -> [String] {
        func randomAlphaNumericString(length: Int) -> String {
            

        
        // Generate a set of ten values that are encrypted and then
        // stored as a tuple (decrypted, encrypted)
        let strings = (0..<length).map { i in
            return randomAlphaNumericString(Int(pow(2.0, Double(i))))
        }
        
        return strings
