      "%%writefile test_permutations.py\n",
      "from nose.tools import assert_equal\n",
      "\n",
      "\n",
      "class TestPermutations(object):\n",
      "\n",
      "    def test_permutations(self):\n",
      "        permutations = Permutations()\n",
      "        assert_equal(permutations.find_permutations(None), None)\n",
      "        assert_equal(permutations.find_permutations(''), '')\n",
 
</s> remove     "class TestPermutations(object):\n",
 </s> add     "class TestPermutations(unittest.TestCase):\n", </s> remove     "        assert_equal(permutations.find_permutations(None), None)\n",
    "        assert_equal(permutations.find_permutations(''), '')\n",
 </s> add     "        self.assertEqual(permutations.find_permutations(None), None)\n",
    "        self.assertEqual(permutations.find_permutations(''), '')\n", </s> remove     "        assert_equal(permutations.find_permutations(None), None)\n",
    "        assert_equal(permutations.find_permutations(''), '')\n",
 </s> add     "        self.assertEqual(permutations.find_permutations(None), None)\n",
    "        self.assertEqual(permutations.find_permutations(''), '')\n", </s> remove     "from nose.tools import assert_equal\n",
 </s> add     "import unittest\n", </s> remove     "from nose.tools import assert_equal\n",
 </s> add     "import unittest\n",
    "class TestPermutations(unittest.TestCase):\n",
      "%%writefile test_permutations.py\n",
      "from nose.tools import assert_equal\n",
      "\n",
      "\n",
    "class TestPermutations(unittest.TestCase):\n",
      "\n",
      "    def test_permutations(self):\n",
      "        permutations = Permutations()\n",
      "        assert_equal(permutations.find_permutations(None), None)\n",
      "        assert_equal(permutations.find_permutations(''), '')\n",
keep keep keep keep replace keep keep keep keep keep
 #273: Remove nose dependency for recursion_dynamic/ (#280) 
recursion_dynamic/permutations/permutations_solution.ipynb