Added a simple unit test to ensure E(D(M)) = M

SimpleTests/EncryptEqualsDecrypt.cpp

@@ -0,0 +1,44 @@
+#include "CppUnitTest.h"
+#include "../GhettoCrypt/Cipher.h"
+#include "../GhettoCrypt/Util.h"
+
+using namespace Microsoft::VisualStudio::CppUnitTestFramework;
+using namespace GhettoCipher;
+
+namespace SimpleTests
+{
+	TEST_CLASS(EncryptEqualsDecrypt)
+	{
+	public:
+		
+		// Tests that a decrypted ciphertext equals its plaintrext version
+		TEST_METHOD(tEncryptEqualsDecrypt)
+		{
+			// Yes, this unit test should ideally exclude string conversions,
+			// But like this it's easier to see what it's doing
+
+			// Define basic input
+			const std::string cleartext = "Hello, World!";
+			const std::string password  = "1234";
+
+
+			// Instanciate our cipher and supply a key
+			const Cipher cipher(password);
+
+			// Recode the ascii-string to bits
+			const Flexblock cleartext_bits = StringToBits(cleartext);
+
+			// Encrypt our cleartext bits
+			const Flexblock ciphertext_bits = cipher.Encipher(cleartext_bits);
+			
+			// Decipher it again
+			const Flexblock decryptedBits = cipher.Decipher(ciphertext_bits);
+
+			// Decode it back to ascii
+			const std::string decryptedText = BitsToString(decryptedBits);
+
+			// Assert that the decrypted text equals the plaintext
+			Assert::AreEqual(cleartext.length(), decryptedText.length());
+		}
+	};
+}