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   "source": [
    "# Effective Python - 59 Specific Ways to Write Better Python. \n",
    "# *Chapter 8 - Production*\n",
    "Book by Brett Slatkin. \n",
    "Summary notes by Tyler Banks."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Item 56: Test Everything with unittest"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "* Use `unittest` module to test your utilities"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "# utils.py\n",
    "def to_str(data):\n",
    "    if isinstance(data, str):\n",
    "        return data\n",
    "    elif isinstance(data, bytes):\n",
    "        return data.decode('utf-8')\n",
    "    else:\n",
    "        raise TypeError('Must supply str or bytes, found: %r' % data)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [],
   "source": [
    "# utils_test.py\n",
    "from unittest import TestCase, main\n",
    "#from utils import to_str\n",
    "class UtilsTestCase(TestCase):\n",
    "    def test_to_str_bytes(self):\n",
    "        self.assertEqual('hello', to_str(b'hello'))\n",
    "    def test_to_str_str(self):\n",
    "        self.assertEqual('hello', to_str('hello'))\n",
    "    def test_to_str_bad(self):\n",
    "        self.assertRaises(TypeError, to_str, object())\n",
    "#if __name__ == '__main__':\n",
    "#    main()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "* Use `setUp` and `tearDown`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [],
   "source": [
    "class MyTest(TestCase):\n",
    "    def setUp(self):\n",
    "        self.test_dir = TemporaryDirectory()\n",
    "    def tearDown(self):\n",
    "        self.test_dir.cleanup()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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