Migrated tests to jest

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

test6/truncateString/truncateString.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const truncateString = require('./truncateString.js');
+
+test('Testing truncateString', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof truncateString === 'function').toBeTruthy();
+  expect(truncateString('boomerang', 7)).toBe('boom...');
+});