Migrated tests to jest

Used jest-codemods to migrate, will have to pass everything by hand before we can merge.

test6/stringPermutations/stringPermutations.test.js

@@ -0,0 +1,11 @@
+const expect = require('expect');
+const stringPermutations = require('./stringPermutations.js');
+
+test('Testing stringPermutations', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof stringPermutations === 'function').toBeTruthy();
+  expect(stringPermutations('abc')).toEqual(['abc','acb','bac','bca','cab','cba']);
+  expect(stringPermutations('a')).toEqual(['a']);
+  expect(stringPermutations('')).toEqual(['']);
+});