Test migration to jest by hand

Apparently using regular expressions is way easier.

test/unary/unary.test.js

@@ -0,0 +1,10 @@
+const expect = require('expect');
+const unary = require('./unary.js');
+
+
+  test('unary is a Function', () => {
+  expect(unary).toBeInstanceOf(Function);
+});
+  t.deepEqual(['6', '8', '10'].map(unary(parseInt)), [6, 8, 10], 'Discards arguments after the first one');
+  
+