Test migration to jest by hand

Apparently using regular expressions is way easier.

test/reject/reject.test.js

@@ -0,0 +1,24 @@
+const expect = require('expect');
+const reject = require('./reject.js');
+
+
+  test('reject is a Function', () => {
+  expect(reject).toBeInstanceOf(Function);
+});
+
+  const noEvens = reject(
+    (x) => x % 2 === 0,
+    [1, 2, 3, 4, 5]
+  );
+
+  t.deepEqual(noEvens, [1, 3, 5]);
+
+  const fourLettersOrLess = reject(
+    (word) => word.length > 4,
+    ['Apple', 'Pear', 'Kiwi', 'Banana']
+  );
+
+  t.deepEqual(fourLettersOrLess, ['Pear', 'Kiwi']);
+
+  
+