      "class TestSolution(object):\n",
      "\n",
      "    def test_format_license_key(self):\n",
      "        solution = Solution()\n",
      "        assert_raises(TypeError, solution.format_license_key, None, None)\n",
      "        license_key = '---'\n",
      "        k = 3\n",
      "        expected = ''\n",
      "        assert_equal(solution.format_license_key(license_key, k), expected)\n",
      "        license_key = '2-4A0r7-4k'\n",
 
</s> remove     "        assert_raises(TypeError, solution.format_license_key, None, None)\n",
 </s> add     "        self.assertRaises(TypeError, solution.format_license_key, None, None)\n", </s> remove     "        assert_equal(solution.format_license_key(license_key, k), expected)\n",
 </s> add     "        self.assertEqual(solution.format_license_key(license_key, k), expected)\n", </s> remove     "        assert_equal(solution.format_license_key(license_key, k), expected)\n",
 </s> add     "        self.assertEqual(solution.format_license_key(license_key, k), expected)\n", </s> remove     "        assert_equal(solution.format_license_key(license_key, k), expected)\n",
 </s> add     "        self.assertEqual(solution.format_license_key(license_key, k), expected)\n", </s> remove     "        assert_equal(solution.format_license_key(license_key, k), expected)\n",
 </s> add     "        self.assertEqual(solution.format_license_key(license_key, k), expected)\n",
    "        self.assertRaises(TypeError, solution.format_license_key, None, None)\n",
      "class TestSolution(object):\n",
      "\n",
      "    def test_format_license_key(self):\n",
      "        solution = Solution()\n",
    "        self.assertRaises(TypeError, solution.format_license_key, None, None)\n",
      "        license_key = '---'\n",
      "        k = 3\n",
      "        expected = ''\n",
      "        assert_equal(solution.format_license_key(license_key, k), expected)\n",
      "        license_key = '2-4A0r7-4k'\n",
keep keep keep keep replace keep keep keep keep keep
 #273: Remove nose dependency for online_judges/ (#282) 
online_judges/license_key/format_license_key_challenge.ipynb