Test Onionoo instance is an object

test/unit.js

@@ -9,3 +9,7 @@ test('Onionoo cannot be invoked without \'new\'', t => {
   t.throws(() => Onionoo())
   t.notThrows(() => new Onionoo())
 })
+
+test('Onionoo instance is an object', t => {
+  t.is(typeof new Onionoo(), 'object')
+})