old_contents: 
  import os.path as op
  import pytest
  from unittest import TestCase
  from darwin.utils import instance
  
  CWD = op.dirname(op.realpath(__file__))
  MODULE_DIR = op.join(CWD, '..', 'darwin')
  
  
  class TestImports(TestCase):
  
      def test_import_this(self):
          """Test import_this function"""
          cls = instance.import_this('collections.defaultdict')
          assert(cls.__module__ == 'collections')
  
      def test_import_this_raises(self):
          """Test import_this function raising an Exception"""
          pytest.raises(Exception, instance.import_this, 'wrong.module')
  
      def test_import_pyfile_ioerror(self):
          pytest.raises(IOError, instance.import_pyfile, op.join(MODULE_DIR, 'dontexists'))
  
      def test_import_pyfile(self):
          imp_inst = instance.import_pyfile(op.join(MODULE_DIR, 'logger.py'), 'setup_logging')
          assert('imp_inst' in sys.modules)
          assert(has_attr(imp_inst, 'import_pyfile'))
  
  
  class TestInstantiator(TestCase):
  
      def test_learner_yaml_instance(self):
          inst = instance.Instantiator(op.join(MODULE_DIR, 'learners.yml'))
          learner_item_name = 'LinearSVC'
          cls = inst.get_class_instance(learner_item_name)
          item = inst.get_yaml_item(learner_item_name)
          assert(type(cls).__name__ == item['class'].split('.')[-1])
  
      def test_learner_yaml_raises_ioerror(self):
          pytest.raises(IOError, instance.Instantiator, 'notexist')
  
      def test_learner_yaml_raises_keyerror(self):
          inst = instance.Instantiator(op.join(MODULE_DIR, 'learners.yml'))
          learner_item_name = 'NotExist'
          pytest.raises(KeyError, inst.get_class_instance, learner_item_name)
  
new_contents: # -*- coding: utf-8 -*-
  import os.path as op
  import pytest
  from unittest import TestCase
  from darwin.utils import instance
  
  CWD = op.dirname(op.realpath(__file__))
  MODULE_DIR = op.join(CWD, '..', 'darwin')
  
  
  class TestImports(TestCase):
  
      def test_import_this(self):
          """Test import_this function"""
          cls = instance.import_this('collections.defaultdict')
          assert(cls.__module__ == 'collections')
  
      def test_import_this_raises(self):
          """Test import_this function raising an Exception"""
          pytest.raises(Exception, instance.import_this, 'wrong.module')
  
      def test_import_pyfile_ioerror(self):
          pytest.raises(IOError, instance.import_pyfile, op.join(MODULE_DIR, 'dontexists'))
  
      def test_import_pyfile(self):
          imp_inst = instance.import_pyfile(op.join(MODULE_DIR, 'logger.py'), 'setup_logging')
          assert('imp_inst' in sys.modules)
          assert(has_attr(imp_inst, 'import_pyfile'))
  
  
  class TestInstantiator(TestCase):
  
      def test_learner_yaml_instance(self):
          inst = instance.Instantiator(op.join(MODULE_DIR, 'learners.yml'))
          learner_item_name = 'LinearSVC'
          cls = inst.get_class_instance(learner_item_name)
          item = inst.get_yaml_item(learner_item_name)
          assert(type(cls).__name__ == item['class'].split('.')[-1])
  
      def test_learner_yaml_raises_ioerror(self):
          pytest.raises(IOError, instance.Instantiator, 'notexist')
  
      def test_learner_yaml_raises_keyerror(self):
          inst = instance.Instantiator(op.join(MODULE_DIR, 'learners.yml'))
          learner_item_name = 'NotExist'
          pytest.raises(KeyError, inst.get_class_instance, learner_item_name)
  
subject: Add test encoding header tag