Test migration to jest by hand

Apparently using regular expressions is way easier.

test/reducedFilter/reducedFilter.test.js

@@ -0,0 +1,21 @@
+const expect = require('expect');
+const reducedFilter = require('./reducedFilter.js');
+
+
+  test('reducedFilter is a Function', () => {
+  expect(reducedFilter).toBeInstanceOf(Function);
+});
+  const data = [
+    {
+      id: 1,
+      name: 'john',
+      age: 24
+    },
+    {
+      id: 2,
+      name: 'mike',
+      age: 50
+    }
+    ];
+    t.deepEqual(reducedFilter(data, ['id', 'name'], item => item.age > 24), [{ id: 2, name: 'mike'}], "Filter an array of objects based on a condition while also filtering out unspecified keys.");
+