{
  "exercise": "simple-cipher",
  "version": "1.0.0",
  "comments":
    ["Some of the strings used in this file are symbolic and do not represent their literal value. They are:",
      "cipher.key - Represents the Cipher key",
      "cipher.encode - Represents the output of the Cipher encode method",
      "new - Represents the Cipher initialization"],
  "cases": [
    {
      "description": "Random key cipher",
      "cases": [
        {
          "description": "Can encode",
          "property": "encode",
          "input": {
            "plaintext": "aaaaaaaaaa"
          },
          "expected": "cipher.key"
        },
        {
          "description": "Can decode",
          "property": "decode",
          "input": {
            "ciphertext": "cipher.key"
          },
          "expected": "aaaaaaaaaa"
        },
        {
          "description": "Is reversible. I.e., if you apply decode in a encoded result, you must see the same plaintext encode parameter as a result of the decode method",
          "property": "decode",
          "input": {
            "plaintext": "abcdefghij",
            "ciphertext": "cipher.encode"
          },
          "expected": "abcdefghij"
        },
        {
          "description": "Key is made only of lowercase letters",
          "property": "key",
          "input": {},
          "expected": {
            "match": "^[a-z]+$"
          }
        }
      ]
    },
    {
      "description": "Substitution cipher",
      "cases": [
        {
          "description": "Can encode",
          "property": "encode",
          "input": {
            "key": "abcdefghij",
            "plaintext": "aaaaaaaaaa"
          },
          "expected": "abcdefghij"
        },
        {
          "description": "Can decode",
          "property": "decode",
          "input": {
            "key": "abcdefghij",
            "ciphertext": "abcdefghij"
          },
          "expected": "aaaaaaaaaa"
        },
        {
          "description": "Is reversible. I.e., if you apply decode in a encoded result, you must see the same plaintext encode parameter as a result of the decode method",
          "property": "decode",
          "input": {
            "key": "abcdefghij",
            "plaintext": "abcdefghij",
            "ciphertext": "cipher.encode"
          },
          "expected": "abcdefghij"
        },
        {
          "description": "Can double shift encode",
          "property": "encode",
          "input": {
            "key": "iamapandabear",
            "plaintext": "iamapandabear"
          },
          "expected": "qayaeaagaciai"
        },
        {
          "description": "Can wrap on encode", 
          "property": "encode",
          "input": {
            "key": "abcdefghij",
            "plaintext": "zzzzzzzzzz"
          },
          "expected": "zabcdefghi"
        },
        {
          "description": "Can wrap on decode",
          "property": "decode",
          "input": {
            "key": "abcdefghij",
            "ciphertext": "zabcdefghi"
          },
          "expected": "zzzzzzzzzz"
        },
        {
          "description": "Can handle messages longer than the key",
          "property": "encode",
          "input": {
            "key": "abc",
            "plaintext": "iamapandabear"
          },
          "expected": "iboaqcnecbfcr"
        }
      ]
    },
    {
      "description": "Incorrect key cipher",
      "cases": [
        {
          "description": "Throws an error with an all uppercase key",
          "property": "new",
          "input": {
            "key": "ABCDEF"
          },
          "expected": { "error": "Bad key" }
        },
        {
          "description": "Throws an error with a numeric key",
          "property": "new",
          "input": {
            "key": "12345"
          },
          "expected": { "error": "Bad key" }
        },
        {
          "description": "Throws an error with empty key",
          "property": "new",
          "input": {
            "key": ""
          },
          "expected": { "error": "Bad key" }
        }
      ]
    }
  ]
}