from nose.tools import assert_true, assert_false
from imagekit.cachefiles import ImageCacheFile
from mock import Mock
from .utils import create_image
from django.core.files.storage import FileSystemStorage
from imagekit.cachefiles.backends import Simple as SimpleCFBackend
from imagekit.cachefiles.strategies import Optimistic as OptimisticStrategy


class ImageGenerator(object):
    def generate(self):
        return create_image()

    def get_hash(self):
        return 'abc123'


def get_image_cache_file():
    storage = Mock(FileSystemStorage)
    backend = SimpleCFBackend()
    strategy = OptimisticStrategy()
    generator = ImageGenerator()
    return ImageCacheFile(generator, storage=storage,
                          cachefile_backend=backend,
                          cachefile_strategy=strategy)


def test_no_io_on_bool():
    """
    When checking the truthiness of an ImageCacheFile, the storage shouldn't
    peform IO operations.

    """
    file = get_image_cache_file()
    bool(file)
    assert_false(file.storage.exists.called)
    assert_false(file.storage.open.called)

from nose.tools import assert_true, assert_false
from imagekit.cachefiles import ImageCacheFile
from mock import Mock
from .utils import create_image
from django.core.files.storage import FileSystemStorage
from imagekit.cachefiles.backends import Simple as SimpleCFBackend
from imagekit.cachefiles.strategies import Optimistic as OptimisticStrategy


class ImageGenerator(object):
    def generate(self):
        return create_image()

    def get_hash(self):
        return 'abc123'


def get_image_cache_file():
    storage = Mock(FileSystemStorage)
    backend = SimpleCFBackend()
    strategy = OptimisticStrategy()
    generator = ImageGenerator()
    return ImageCacheFile(generator, storage=storage,
                          cachefile_backend=backend,
                          cachefile_strategy=strategy)


def test_no_io_on_bool():
    """
    When checking the truthiness of an ImageCacheFile, the storage shouldn't
    peform IO operations.

    """
    file = get_image_cache_file()
    bool(file)
    assert_false(file.storage.exists.called)
    assert_false(file.storage.open.called)


def test_no_io_on_url():
    """
    When getting the URL of an ImageCacheFile, the storage shouldn't be
    checked.

    """
    file = get_image_cache_file()
    file.url
    assert_false(file.storage.exists.called)
    assert_false(file.storage.open.called)

Test that there isn't IO done when you get a URL
Test that there isn't IO done when you get a URL

  from nose.tools import assert_true, assert_false
  from imagekit.cachefiles import ImageCacheFile
  from mock import Mock
  from .utils import create_image
  from django.core.files.storage import FileSystemStorage
  from imagekit.cachefiles.backends import Simple as SimpleCFBackend
  from imagekit.cachefiles.strategies import Optimistic as OptimisticStrategy
  
  
  class ImageGenerator(object):
      def generate(self):
          return create_image()
  
      def get_hash(self):
          return 'abc123'
  
  
  def get_image_cache_file():
      storage = Mock(FileSystemStorage)
      backend = SimpleCFBackend()
      strategy = OptimisticStrategy()
      generator = ImageGenerator()
      return ImageCacheFile(generator, storage=storage,
                            cachefile_backend=backend,
                            cachefile_strategy=strategy)
  
  
  def test_no_io_on_bool():
      """
      When checking the truthiness of an ImageCacheFile, the storage shouldn't
      peform IO operations.
  
      """
      file = get_image_cache_file()
      bool(file)
      assert_false(file.storage.exists.called)
      assert_false(file.storage.open.called)
  
+ 
+ def test_no_io_on_url():
+     """
+     When getting the URL of an ImageCacheFile, the storage shouldn't be
+     checked.
+ 
+     """
+     file = get_image_cache_file()
+     file.url
+     assert_false(file.storage.exists.called)
+     assert_false(file.storage.open.called)
+ 
Test that there isn't IO done when you get a URL
## Code Before:
from nose.tools import assert_true, assert_false
from imagekit.cachefiles import ImageCacheFile
from mock import Mock
from .utils import create_image
from django.core.files.storage import FileSystemStorage
from imagekit.cachefiles.backends import Simple as SimpleCFBackend
from imagekit.cachefiles.strategies import Optimistic as OptimisticStrategy


class ImageGenerator(object):
    def generate(self):
        return create_image()

    def get_hash(self):
        return 'abc123'


def get_image_cache_file():
    storage = Mock(FileSystemStorage)
    backend = SimpleCFBackend()
    strategy = OptimisticStrategy()
    generator = ImageGenerator()
    return ImageCacheFile(generator, storage=storage,
                          cachefile_backend=backend,
                          cachefile_strategy=strategy)


def test_no_io_on_bool():
    """
    When checking the truthiness of an ImageCacheFile, the storage shouldn't
    peform IO operations.

    """
    file = get_image_cache_file()
    bool(file)
    assert_false(file.storage.exists.called)
    assert_false(file.storage.open.called)

## Instruction:
Test that there isn't IO done when you get a URL
## Code After:
from nose.tools import assert_true, assert_false
from imagekit.cachefiles import ImageCacheFile
from mock import Mock
from .utils import create_image
from django.core.files.storage import FileSystemStorage
from imagekit.cachefiles.backends import Simple as SimpleCFBackend
from imagekit.cachefiles.strategies import Optimistic as OptimisticStrategy


class ImageGenerator(object):
    def generate(self):
        return create_image()

    def get_hash(self):
        return 'abc123'


def get_image_cache_file():
    storage = Mock(FileSystemStorage)
    backend = SimpleCFBackend()
    strategy = OptimisticStrategy()
    generator = ImageGenerator()
    return ImageCacheFile(generator, storage=storage,
                          cachefile_backend=backend,
                          cachefile_strategy=strategy)


def test_no_io_on_bool():
    """
    When checking the truthiness of an ImageCacheFile, the storage shouldn't
    peform IO operations.

    """
    file = get_image_cache_file()
    bool(file)
    assert_false(file.storage.exists.called)
    assert_false(file.storage.open.called)


def test_no_io_on_url():
    """
    When getting the URL of an ImageCacheFile, the storage shouldn't be
    checked.

    """
    file = get_image_cache_file()
    file.url
    assert_false(file.storage.exists.called)
    assert_false(file.storage.open.called)
