Test migration to jest by hand

Apparently using regular expressions is way easier.

test/filterNonUnique/filterNonUnique.js

@@ -0,0 +1,2 @@
+const filterNonUnique = arr => arr.filter(i => arr.indexOf(i) === arr.lastIndexOf(i));
+module.exports = filterNonUnique;

test/filterNonUnique/filterNonUnique.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const filterNonUnique = require('./filterNonUnique.js');
+
+
+  test('filterNonUnique is a Function', () => {
+  expect(filterNonUnique).toBeInstanceOf(Function);
+});
+  t.deepEqual(filterNonUnique([1, 2, 2, 3, 4, 4, 5]), [1,3,5], "Filters out the non-unique values in an array");
+