Test migration to jest by hand

Apparently using regular expressions is way easier.

test/isNil/isNil.test.js

@@ -0,0 +1,12 @@
+const expect = require('expect');
+const isNil = require('./isNil.js');
+
+
+  test('isNil is a Function', () => {
+  expect(isNil).toBeInstanceOf(Function);
+});
+  t.equal(isNil(null), true, 'Returns true for null');
+  t.equal(isNil(undefined), true, 'Returns true for undefined');
+  t.equal(isNil(''), false, 'Returns false for an empty string');
+  
+