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434 lines
16 KiB
Python
434 lines
16 KiB
Python
from __future__ import absolute_import
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import os
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import shutil
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from django.core.files import File
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from django.core.files.images import ImageFile
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from django.test import TestCase
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from django.utils.unittest import skipIf
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from .models import Image
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if Image:
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from .models import (Person, PersonWithHeight, PersonWithHeightAndWidth,
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PersonDimensionsFirst, PersonTwoImages, TestImageFieldFile)
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from .models import temp_storage_dir
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else:
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# PIL not available, create dummy classes (tests will be skipped anyway)
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class Person():
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pass
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PersonWithHeight = PersonWithHeightAndWidth = PersonDimensionsFirst = Person
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PersonTwoImages = Person
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class ImageFieldTestMixin(object):
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"""
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Mixin class to provide common functionality to ImageField test classes.
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"""
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# Person model to use for tests.
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PersonModel = PersonWithHeightAndWidth
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# File class to use for file instances.
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File = ImageFile
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def setUp(self):
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"""
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Creates a pristine temp directory (or deletes and recreates if it
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already exists) that the model uses as its storage directory.
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Sets up two ImageFile instances for use in tests.
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"""
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if os.path.exists(temp_storage_dir):
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shutil.rmtree(temp_storage_dir)
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os.mkdir(temp_storage_dir)
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file_path1 = os.path.join(os.path.dirname(__file__), "4x8.png")
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self.file1 = self.File(open(file_path1, 'rb'))
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file_path2 = os.path.join(os.path.dirname(__file__), "8x4.png")
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self.file2 = self.File(open(file_path2, 'rb'))
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def tearDown(self):
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"""
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Removes temp directory and all its contents.
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"""
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shutil.rmtree(temp_storage_dir)
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def check_dimensions(self, instance, width, height,
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field_name='mugshot'):
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"""
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Asserts that the given width and height values match both the
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field's height and width attributes and the height and width fields
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(if defined) the image field is caching to.
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Note, this method will check for dimension fields named by adding
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"_width" or "_height" to the name of the ImageField. So, the
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models used in these tests must have their fields named
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accordingly.
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By default, we check the field named "mugshot", but this can be
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specified by passing the field_name parameter.
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"""
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field = getattr(instance, field_name)
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# Check height/width attributes of field.
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if width is None and height is None:
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self.assertRaises(ValueError, getattr, field, 'width')
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self.assertRaises(ValueError, getattr, field, 'height')
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else:
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self.assertEqual(field.width, width)
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self.assertEqual(field.height, height)
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# Check height/width fields of model, if defined.
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width_field_name = field_name + '_width'
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if hasattr(instance, width_field_name):
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self.assertEqual(getattr(instance, width_field_name), width)
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height_field_name = field_name + '_height'
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if hasattr(instance, height_field_name):
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self.assertEqual(getattr(instance, height_field_name), height)
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@skipIf(Image is None, "PIL is required to test ImageField")
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class ImageFieldTests(ImageFieldTestMixin, TestCase):
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"""
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Tests for ImageField that don't need to be run with each of the
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different test model classes.
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"""
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def test_equal_notequal_hash(self):
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"""
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Bug #9786: Ensure '==' and '!=' work correctly.
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Bug #9508: make sure hash() works as expected (equal items must
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hash to the same value).
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"""
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# Create two Persons with different mugshots.
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p1 = self.PersonModel(name="Joe")
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p1.mugshot.save("mug", self.file1)
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p2 = self.PersonModel(name="Bob")
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p2.mugshot.save("mug", self.file2)
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self.assertEqual(p1.mugshot == p2.mugshot, False)
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self.assertEqual(p1.mugshot != p2.mugshot, True)
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# Test again with an instance fetched from the db.
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p1_db = self.PersonModel.objects.get(name="Joe")
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self.assertEqual(p1_db.mugshot == p2.mugshot, False)
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self.assertEqual(p1_db.mugshot != p2.mugshot, True)
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# Instance from db should match the local instance.
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self.assertEqual(p1_db.mugshot == p1.mugshot, True)
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self.assertEqual(hash(p1_db.mugshot), hash(p1.mugshot))
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self.assertEqual(p1_db.mugshot != p1.mugshot, False)
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def test_instantiate_missing(self):
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"""
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If the underlying file is unavailable, still create instantiate the
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object without error.
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"""
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p = self.PersonModel(name="Joan")
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p.mugshot.save("shot", self.file1)
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p = self.PersonModel.objects.get(name="Joan")
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path = p.mugshot.path
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shutil.move(path, path + '.moved')
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p2 = self.PersonModel.objects.get(name="Joan")
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def test_delete_when_missing(self):
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"""
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Bug #8175: correctly delete an object where the file no longer
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exists on the file system.
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"""
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p = self.PersonModel(name="Fred")
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p.mugshot.save("shot", self.file1)
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os.remove(p.mugshot.path)
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p.delete()
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def test_size_method(self):
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"""
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Bug #8534: FileField.size should not leave the file open.
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"""
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p = self.PersonModel(name="Joan")
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p.mugshot.save("shot", self.file1)
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# Get a "clean" model instance
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p = self.PersonModel.objects.get(name="Joan")
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# It won't have an opened file.
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self.assertEqual(p.mugshot.closed, True)
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# After asking for the size, the file should still be closed.
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_ = p.mugshot.size
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self.assertEqual(p.mugshot.closed, True)
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def test_pickle(self):
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"""
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Tests that ImageField can be pickled, unpickled, and that the
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image of the unpickled version is the same as the original.
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"""
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import pickle
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p = Person(name="Joe")
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p.mugshot.save("mug", self.file1)
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dump = pickle.dumps(p)
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p2 = Person(name="Bob")
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p2.mugshot = self.file1
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loaded_p = pickle.loads(dump)
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self.assertEqual(p.mugshot, loaded_p.mugshot)
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@skipIf(Image is None, "PIL is required to test ImageField")
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class ImageFieldTwoDimensionsTests(ImageFieldTestMixin, TestCase):
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"""
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Tests behavior of an ImageField and its dimensions fields.
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"""
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def test_constructor(self):
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"""
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Tests assigning an image field through the model's constructor.
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"""
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p = self.PersonModel(name='Joe', mugshot=self.file1)
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self.check_dimensions(p, 4, 8)
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p.save()
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self.check_dimensions(p, 4, 8)
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def test_image_after_constructor(self):
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"""
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Tests behavior when image is not passed in constructor.
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"""
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p = self.PersonModel(name='Joe')
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# TestImageField value will default to being an instance of its
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# attr_class, a TestImageFieldFile, with name == None, which will
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# cause it to evaluate as False.
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self.assertEqual(isinstance(p.mugshot, TestImageFieldFile), True)
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self.assertEqual(bool(p.mugshot), False)
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# Test setting a fresh created model instance.
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p = self.PersonModel(name='Joe')
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p.mugshot = self.file1
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self.check_dimensions(p, 4, 8)
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def test_create(self):
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"""
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Tests assigning an image in Manager.create().
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"""
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p = self.PersonModel.objects.create(name='Joe', mugshot=self.file1)
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self.check_dimensions(p, 4, 8)
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def test_default_value(self):
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"""
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Tests that the default value for an ImageField is an instance of
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the field's attr_class (TestImageFieldFile in this case) with no
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name (name set to None).
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"""
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p = self.PersonModel()
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self.assertEqual(isinstance(p.mugshot, TestImageFieldFile), True)
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self.assertEqual(bool(p.mugshot), False)
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def test_assignment_to_None(self):
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"""
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Tests that assigning ImageField to None clears dimensions.
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"""
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p = self.PersonModel(name='Joe', mugshot=self.file1)
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self.check_dimensions(p, 4, 8)
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# If image assigned to None, dimension fields should be cleared.
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p.mugshot = None
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self.check_dimensions(p, None, None)
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p.mugshot = self.file2
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self.check_dimensions(p, 8, 4)
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def test_field_save_and_delete_methods(self):
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"""
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Tests assignment using the field's save method and deletion using
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the field's delete method.
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"""
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p = self.PersonModel(name='Joe')
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p.mugshot.save("mug", self.file1)
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self.check_dimensions(p, 4, 8)
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# A new file should update dimensions.
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p.mugshot.save("mug", self.file2)
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self.check_dimensions(p, 8, 4)
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# Field and dimensions should be cleared after a delete.
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p.mugshot.delete(save=False)
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self.assertEqual(p.mugshot, None)
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self.check_dimensions(p, None, None)
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def test_dimensions(self):
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"""
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Checks that dimensions are updated correctly in various situations.
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"""
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p = self.PersonModel(name='Joe')
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# Dimensions should get set if file is saved.
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p.mugshot.save("mug", self.file1)
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self.check_dimensions(p, 4, 8)
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# Test dimensions after fetching from database.
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p = self.PersonModel.objects.get(name='Joe')
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# Bug 11084: Dimensions should not get recalculated if file is
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# coming from the database. We test this by checking if the file
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# was opened.
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self.assertEqual(p.mugshot.was_opened, False)
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self.check_dimensions(p, 4, 8)
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# After checking dimensions on the image field, the file will have
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# opened.
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self.assertEqual(p.mugshot.was_opened, True)
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# Dimensions should now be cached, and if we reset was_opened and
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# check dimensions again, the file should not have opened.
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p.mugshot.was_opened = False
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self.check_dimensions(p, 4, 8)
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self.assertEqual(p.mugshot.was_opened, False)
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# If we assign a new image to the instance, the dimensions should
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# update.
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p.mugshot = self.file2
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self.check_dimensions(p, 8, 4)
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# Dimensions were recalculated, and hence file should have opened.
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self.assertEqual(p.mugshot.was_opened, True)
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@skipIf(Image is None, "PIL is required to test ImageField")
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class ImageFieldNoDimensionsTests(ImageFieldTwoDimensionsTests):
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"""
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Tests behavior of an ImageField with no dimension fields.
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"""
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PersonModel = Person
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@skipIf(Image is None, "PIL is required to test ImageField")
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class ImageFieldOneDimensionTests(ImageFieldTwoDimensionsTests):
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"""
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Tests behavior of an ImageField with one dimensions field.
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"""
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PersonModel = PersonWithHeight
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@skipIf(Image is None, "PIL is required to test ImageField")
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class ImageFieldDimensionsFirstTests(ImageFieldTwoDimensionsTests):
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"""
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Tests behavior of an ImageField where the dimensions fields are
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defined before the ImageField.
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"""
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PersonModel = PersonDimensionsFirst
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@skipIf(Image is None, "PIL is required to test ImageField")
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class ImageFieldUsingFileTests(ImageFieldTwoDimensionsTests):
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"""
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Tests behavior of an ImageField when assigning it a File instance
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rather than an ImageFile instance.
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"""
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PersonModel = PersonDimensionsFirst
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File = File
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@skipIf(Image is None, "PIL is required to test ImageField")
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class TwoImageFieldTests(ImageFieldTestMixin, TestCase):
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"""
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Tests a model with two ImageFields.
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"""
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PersonModel = PersonTwoImages
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def test_constructor(self):
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p = self.PersonModel(mugshot=self.file1, headshot=self.file2)
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self.check_dimensions(p, 4, 8, 'mugshot')
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self.check_dimensions(p, 8, 4, 'headshot')
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p.save()
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self.check_dimensions(p, 4, 8, 'mugshot')
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self.check_dimensions(p, 8, 4, 'headshot')
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def test_create(self):
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p = self.PersonModel.objects.create(mugshot=self.file1,
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headshot=self.file2)
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self.check_dimensions(p, 4, 8)
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self.check_dimensions(p, 8, 4, 'headshot')
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def test_assignment(self):
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p = self.PersonModel()
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self.check_dimensions(p, None, None, 'mugshot')
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self.check_dimensions(p, None, None, 'headshot')
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p.mugshot = self.file1
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self.check_dimensions(p, 4, 8, 'mugshot')
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self.check_dimensions(p, None, None, 'headshot')
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p.headshot = self.file2
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self.check_dimensions(p, 4, 8, 'mugshot')
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self.check_dimensions(p, 8, 4, 'headshot')
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# Clear the ImageFields one at a time.
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p.mugshot = None
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self.check_dimensions(p, None, None, 'mugshot')
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self.check_dimensions(p, 8, 4, 'headshot')
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p.headshot = None
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self.check_dimensions(p, None, None, 'mugshot')
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self.check_dimensions(p, None, None, 'headshot')
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def test_field_save_and_delete_methods(self):
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p = self.PersonModel(name='Joe')
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p.mugshot.save("mug", self.file1)
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self.check_dimensions(p, 4, 8, 'mugshot')
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self.check_dimensions(p, None, None, 'headshot')
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p.headshot.save("head", self.file2)
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self.check_dimensions(p, 4, 8, 'mugshot')
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self.check_dimensions(p, 8, 4, 'headshot')
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# We can use save=True when deleting the image field with null=True
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# dimension fields and the other field has an image.
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p.headshot.delete(save=True)
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self.check_dimensions(p, 4, 8, 'mugshot')
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self.check_dimensions(p, None, None, 'headshot')
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p.mugshot.delete(save=False)
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self.check_dimensions(p, None, None, 'mugshot')
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self.check_dimensions(p, None, None, 'headshot')
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def test_dimensions(self):
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"""
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Checks that dimensions are updated correctly in various situations.
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"""
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p = self.PersonModel(name='Joe')
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# Dimensions should get set for the saved file.
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p.mugshot.save("mug", self.file1)
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p.headshot.save("head", self.file2)
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self.check_dimensions(p, 4, 8, 'mugshot')
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self.check_dimensions(p, 8, 4, 'headshot')
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# Test dimensions after fetching from database.
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p = self.PersonModel.objects.get(name='Joe')
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# Bug 11084: Dimensions should not get recalculated if file is
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# coming from the database. We test this by checking if the file
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# was opened.
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self.assertEqual(p.mugshot.was_opened, False)
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self.assertEqual(p.headshot.was_opened, False)
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self.check_dimensions(p, 4, 8,'mugshot')
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self.check_dimensions(p, 8, 4, 'headshot')
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# After checking dimensions on the image fields, the files will
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# have been opened.
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self.assertEqual(p.mugshot.was_opened, True)
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self.assertEqual(p.headshot.was_opened, True)
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# Dimensions should now be cached, and if we reset was_opened and
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# check dimensions again, the file should not have opened.
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p.mugshot.was_opened = False
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p.headshot.was_opened = False
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self.check_dimensions(p, 4, 8,'mugshot')
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self.check_dimensions(p, 8, 4, 'headshot')
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self.assertEqual(p.mugshot.was_opened, False)
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self.assertEqual(p.headshot.was_opened, False)
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# If we assign a new image to the instance, the dimensions should
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# update.
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p.mugshot = self.file2
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p.headshot = self.file1
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self.check_dimensions(p, 8, 4, 'mugshot')
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self.check_dimensions(p, 4, 8, 'headshot')
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# Dimensions were recalculated, and hence file should have opened.
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self.assertEqual(p.mugshot.was_opened, True)
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self.assertEqual(p.headshot.was_opened, True)
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