mockdemo.ipynb

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       "2"
      ]
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   "source": [
    "class Foo:\n",
    "    @property \n",
    "    def x(self):\n",
    "        return 1\n",
    "    \n",
    "class Bar(Foo):\n",
    "    @property\n",
    "    def xp1(self):\n",
    "        return self.x + 1\n",
    "    \n",
    "b = Bar()\n",
    "b.xp1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "from unittest.mock import PropertyMock, patch"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3\n"
     ]
    }
   ],
   "source": [
    "with patch('__main__.Foo.x', new_callable=PropertyMock) as mock_foo:  # __main__ might be another file, e.g. ale.drivers.pds3_label\n",
    "    mock_foo.return_value = 2\n",
    "    b = Bar()\n",
    "    assert b.xp1 == 3\n",
    "    print(b.xp1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
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    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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