def test_render_none_to_string(self):
"""
Tests that an ImageNode without image renders an empty string
"""
context = {"image": None}
node = ImageNode(Variable("image"), "original")
rendered = node.render(context)
self.assertEqual(rendered, "")
def test_render_valid_image_to_string(self):
"""
Tests that an ImageNode with a valid image renders an img tag
"""
context = {"image": self.image}
node = ImageNode(Variable("image"), "original")
rendered = node.render(context)
self.assertIn('<img alt="Test image"', rendered)
def test_render_none_to_string(self):
"""
Tests that an ImageNode without image renders an empty string
"""
context = {'image': None}
node = ImageNode(Variable('image'), 'original')
rendered = node.render(context)
self.assertEqual(rendered, '')
def test_render_none_as_context_variable(self):
"""
Tests that an ImageNode without an image and a context variable name
renders an empty string and puts None in the context variable
"""
context = {"image": None, "image_node": "fake value"}
node = ImageNode(Variable("image"), "original", "image_node")
rendered = node.render(context)
self.assertEqual(rendered, "")
self.assertIsNone(context["image_node"])
def test_render_valid_image_as_context_variable(self):
"""
Tests that an ImageNode with a valid image and a context variable name
renders an empty string and puts a rendition in the context variable
"""
context = {"image": self.image, "image_node": "fake value"}
node = ImageNode(Variable("image"), "original", "image_node")
rendered = node.render(context)
self.assertEqual(rendered, "")
self.assertIsInstance(context["image_node"], Rendition)
def test_render_none_as_context_variable(self):
"""
Tests that an ImageNode without an image and a context variable name
renders an empty string and puts None in the context variable
"""
context = {'image': None, 'image_node': 'fake value'}
node = ImageNode(Variable('image'), 'original', 'image_node')
rendered = node.render(context)
self.assertEqual(rendered, '')
self.assertIsNone(context['image_node'])
def test_render_valid_image_as_context_variable(self):
"""
Tests that an ImageNode with a valid image and a context variable name
renders an empty string and puts a rendition in the context variable
"""
context = {'image': self.image, 'image_node': 'fake value'}
node = ImageNode(Variable('image'), 'original', 'image_node')
rendered = node.render(context)
self.assertEqual(rendered, '')
self.assertIsInstance(context['image_node'], Rendition)
def responsiveimage(parser, token):
bits = token.split_contents()[1:]
image_var = bits[0]
filter_spec = bits[1]
bits = bits[2:]
if len(bits) == 2 and bits[0] == 'as':
# token is of the form {% image self.photo max-320x200 as img %}
return ImageNode(image_var, filter_spec, output_var_name=bits[1])
else:
# token is of the form {% image self.photo max-320x200 %} - all additional tokens
# should be kwargs, which become attributes
attrs = {}
for bit in bits:
try:
name, value = bit.split('=')
except ValueError:
raise template.TemplateSyntaxError(
"'image' tag should be of the form {% image self.photo max-320x200 [ custom-attr=\"value\" ... ] %} or {% image self.photo max-320x200 as img %}"
)
attrs[name] = parser.compile_filter(
value) # setup to resolve context variables as value
return ResponsiveImageNode(image_var, filter_spec, attrs=attrs)