Test migration to jest by hand

Apparently using regular expressions is way easier.

test/isEmpty/isEmpty.test.js

@@ -0,0 +1,19 @@
+const expect = require('expect');
+const isEmpty = require('./isEmpty.js');
+
+
+  test('isEmpty is a Function', () => {
+  expect(isEmpty).toBeInstanceOf(Function);
+});
+  t.equal(isEmpty(new Map()), true, 'Returns true for empty Map');
+  t.equal(isEmpty(new Set()), true, 'Returns true for empty Set');
+  t.equal(isEmpty([]), true, 'Returns true for empty array');
+  t.equal(isEmpty({}), true, 'Returns true for empty object');
+  t.equal(isEmpty(''), true, 'Returns true for empty string');
+  t.equal(isEmpty([1, 2]), false, 'Returns false for non-empty array');
+  t.equal(isEmpty({ a: 1, b: 2 }), false, 'Returns false for non-empty object');
+  t.equal(isEmpty('text'), false, 'Returns false for non-empty string');
+  t.equal(isEmpty(123), true, 'Returns true - type is not considered a collection');
+  t.equal(isEmpty(true), true, 'Returns true - type is not considered a collection');
+  
+