ran npm run tdd & generated TDD

test/mask/mask.js

@@ -0,0 +1,2 @@
+module.exports = (cc, num = 4, mask = '*') =>
+('' + cc).slice(0, -num).replace(/./g, mask) + ('' + cc).slice(-num);

test/mask/mask.test.js

@@ -0,0 +1,13 @@
+const test = require('tape');
+const mask = require('./mask.js');
+
+test('Testing mask', (t) => {
+	//For more information on all the methods supported by tape
+	//Please go to https://github.com/substack/tape
+	t.true(typeof mask === 'function', 'mask is a Function');
+	//t.deepEqual(mask(args..), 'Expected');
+	//t.equal(mask(args..), 'Expected');
+	//t.false(mask(args..), 'Expected');
+	//t.throws(mask(args..), 'Expected');
+	t.end();
+});