Test migration to jest by hand

Apparently using regular expressions is way easier.

test/isSymbol/isSymbol.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const isSymbol = require('./isSymbol.js');
+
+
+  test('isSymbol is a Function', () => {
+  expect(isSymbol).toBeInstanceOf(Function);
+});
+  t.equal(isSymbol(Symbol('x')), true, "Checks if the given argument is a symbol");
+