Migrated tests to jest

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

test2/filterNonUnique/filterNonUnique.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const filterNonUnique = require('./filterNonUnique.js');
+
+test('Testing filterNonUnique', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof filterNonUnique === 'function').toBeTruthy();
+  expect(filterNonUnique([1, 2, 2, 3, 4, 4, 5])).toEqual([1,3,5]);
+});