old_contents: import io
  import sys
  
  import pretend
  import pytest
  
  from ..backends.dotenv import DotenvBackend
  
  
  if sys.version_info[0] == 3:
      builtins_open = 'builtins.open'
  else:  # pragma: no cover
      builtins_open = '__builtin__.open'
  
  
  def test_dotenv_init_bad_install(monkeypatch):
      monkeypatch.setattr('configstore.backends.dotenv.dotenv', None)
  
      with pytest.raises(ImportError):
          DotenvBackend('/secrets/app')
  
  
  def test_dotenv_init_bad_file(monkeypatch):
      with pytest.raises(IOError):
          DotenvBackend('/this/does/not/exist')
  
      with pytest.raises(IOError):
          DotenvBackend('/home')
  
  
  def test_dotenv_success(monkeypatch):
      content = u'APP_SECRET_KEY=1234abcd'
      fake_open = pretend.call_recorder(lambda path: io.StringIO(content))
      monkeypatch.setattr(builtins_open, fake_open)
  
      b = DotenvBackend('/some/path')
      value = b.get_config('APP_SECRET_KEY')
  
      assert value == '1234abcd'
      assert fake_open.calls == [pretend.call('/some/path')]
  
  
  def test_dotenv_missing(monkeypatch):
      content = u'APP_SECRET_KEY=1234abcd'
      fake_open = pretend.call_recorder(lambda path: io.StringIO(content))
      monkeypatch.setattr(builtins_open, fake_open)
  
      b = DotenvBackend('/some/path')
      value = b.get_config('APP_DEBUG')
  
      assert value is None
  
new_contents: import io
  import sys
  
  import pretend
  import pytest
  
  from ..backends.dotenv import DotenvBackend
  
  
  if sys.version_info[0] == 3:
      builtins_open = 'builtins.open'
  else:  # pragma: no cover
      builtins_open = '__builtin__.open'
  
  
  def test_dotenv_init_bad_install(monkeypatch):
      monkeypatch.setattr('configstore.backends.dotenv.dotenv', None)
  
      with pytest.raises(ImportError):
          DotenvBackend('/secrets/app')
  
  
  def test_dotenv_init_bad_file(monkeypatch):
      with pytest.raises(IOError):
          DotenvBackend('/this/does/not/exist')
  
      with pytest.raises(IOError):
          DotenvBackend('/home')
  
  
  def test_dotenv_success(monkeypatch):
      content = u'APP_SECRET_KEY=1234abcd'
      fake_open = pretend.call_recorder(lambda path: io.StringIO(content))
      monkeypatch.setattr(builtins_open, fake_open)
  
      b = DotenvBackend('/some/path')
      value = b.get_config('APP_SECRET_KEY')
  
      assert value == '1234abcd'
      assert fake_open.calls == [pretend.call('/some/path')]
  
  
  def test_dotenv_missing(monkeypatch):
      content = u'APP_SECRET_KEY=1234abcd'
      fake_open = lambda path: io.StringIO(content)
      monkeypatch.setattr(builtins_open, fake_open)
  
      b = DotenvBackend('/some/path')
      value = b.get_config('APP_DEBUG')
  
      assert value is None
  
subject: remove unused helper