Added tests

.travis.yml

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+dist: trusty
+sudo: required
+env:
+    - SWIFT_VERSION=4.0.3
+language:               node_js
+node_js:
+    - "node"
+    - "lts/*"
+    - "7"
+    - "8"
+before_install:
+    - npm install -g npm@latest
+    - npm install -g eye.js
+install:
+    - eval "$(curl -sL https://swiftenv.fuller.li/install.sh)" # Install swift
+script:
+    - eye # JS
+    - swiftc swift/lib.swift -o out # Swift
+notifications:
+  email:                false

js/__test__/test.js

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+// Test made using EyeJS - https://eye.js.org
+
+const path = require('path').normalize(__testDir + "/../")
+
+const { encrypt, decrypt } = require(path + "lib.js")
+
+eye.test("Encryption", "node",
+	$ => $(encrypt("Hello World!")).Equal("H3ll0 W0rld!"),
+	$ => $(encrypt("LEETLANGUAGE")).Equal("L337L4N6U463")
+)
+eye.test("Decryption", "node",
+	$ => $(decrypt("H3ll0 W0rld!")).Equal("Hello World!"),
+	$ => $(decrypt(encrypt("CrypTools"))).Equal("Cryptools") // 'T' becomes 't', because T = t = 7 
+)