added unit testing, and started implementing unit tests...phew

node_modules/atob/test.js

@@ -0,0 +1,18 @@
+(function () {
+  "use strict";
+
+  var atob = require('.');
+  var encoded = "SGVsbG8sIFdvcmxkIQ=="
+  var unencoded = "Hello, World!";
+  /*
+    , encoded = "SGVsbG8sIBZM"
+    , unencoded = "Hello, 世界"
+  */
+
+  if (unencoded !== atob(encoded)) {
+    console.log('[FAIL]', unencoded, atob(encoded));
+    return;
+  }
+
+  console.log('[PASS] all tests pass');
+}());