Migrated tests to jest

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

test3/intersection/intersection.test.js

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