Test migration to jest by hand

Apparently using regular expressions is way easier.

test/isBoolean/isBoolean.test.js

@@ -0,0 +1,10 @@
+const expect = require('expect');
+const isBoolean = require('./isBoolean.js');
+
+
+  test('isBoolean is a Function', () => {
+  expect(isBoolean).toBeInstanceOf(Function);
+});
+  t.equal(isBoolean(null), false, "passed value is not a boolean");
+  t.equal(isBoolean(false), true, "passed value is not a boolean");
+