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import os
from django.template import Context, Engine, TemplateDoesNotExist
from django.test import SimpleTestCase
from .utils import ROOT
RECURSIVE = os.path.join(ROOT, 'recursive_templates')
class ExtendsBehaviorTests(SimpleTestCase):
def test_normal_extend(self):
engine = Engine(dirs=[os.path.join(RECURSIVE, 'fs')])
template = engine.get_template('one.html')
output = template.render(Context({}))
self.assertEqual(output.strip(), 'three two one')
def test_extend_recursive(self):
engine = Engine(dirs=[
os.path.join(RECURSIVE, 'fs'),
os.path.join(RECURSIVE, 'fs2'),
os.path.join(RECURSIVE, 'fs3'),
])
template = engine.get_template('recursive.html')
output = template.render(Context({}))
self.assertEqual(output.strip(), 'fs3/recursive fs2/recursive fs/recursive')
def test_extend_missing(self):
engine = Engine(dirs=[os.path.join(RECURSIVE, 'fs')])
template = engine.get_template('extend-missing.html')
with self.assertRaises(TemplateDoesNotExist) as e:
template.render(Context({}))
tried = e.exception.tried
self.assertEqual(len(tried), 1)
self.assertEqual(tried[0][0].template_name, 'missing.html')
def test_recursive_multiple_loaders(self):
engine = Engine(
dirs=[os.path.join(RECURSIVE, 'fs')],
loaders=[(
'django.template.loaders.locmem.Loader', {
'one.html': (
'{% extends "one.html" %}{% block content %}{{ block.super }} locmem-one{% endblock %}'
),
'two.html': (
'{% extends "two.html" %}{% block content %}{{ block.super }} locmem-two{% endblock %}'
),
'three.html': (
'{% extends "three.html" %}{% block content %}{{ block.super }} locmem-three{% endblock %}'
),
}
), 'django.template.loaders.filesystem.Loader'],
)
template = engine.get_template('one.html')
output = template.render(Context({}))
self.assertEqual(output.strip(), 'three locmem-three two locmem-two one locmem-one')
def test_extend_self_error(self):
"""
Catch if a template extends itself and no other matching
templates are found.
"""
engine = Engine(dirs=[os.path.join(RECURSIVE, 'fs')])
template = engine.get_template('self.html')
with self.assertRaises(TemplateDoesNotExist) as e:
template.render(Context({}))
tried = e.exception.tried
self.assertEqual(len(tried), 1)
origin, message = tried[0]
self.assertEqual(origin.template_name, 'self.html')
self.assertEqual(message, 'Skipped to avoid recursion')
def test_extend_cached(self):
engine = Engine(
dirs=[
os.path.join(RECURSIVE, 'fs'),
os.path.join(RECURSIVE, 'fs2'),
os.path.join(RECURSIVE, 'fs3'),
],
loaders=[
('django.template.loaders.cached.Loader', [
'django.template.loaders.filesystem.Loader',
]),
],
)
template = engine.get_template('recursive.html')
output = template.render(Context({}))
self.assertEqual(output.strip(), 'fs3/recursive fs2/recursive fs/recursive')
cache = engine.template_loaders[0].get_template_cache
self.assertEqual(len(cache), 3)
expected_path = os.path.join('fs', 'recursive.html')
self.assertTrue(cache['recursive.html'].origin.name.endswith(expected_path))
# Render another path that uses the same templates from the cache
template = engine.get_template('other-recursive.html')
output = template.render(Context({}))
self.assertEqual(output.strip(), 'fs3/recursive fs2/recursive fs/recursive')
# Template objects should not be duplicated.
self.assertEqual(len(cache), 4)
expected_path = os.path.join('fs', 'other-recursive.html')
self.assertTrue(cache['other-recursive.html'].origin.name.endswith(expected_path))
def test_unique_history_per_loader(self):
"""
Extending should continue even if two loaders return the same
name for a template.
"""
engine = Engine(
loaders=[
['django.template.loaders.locmem.Loader', {
'base.html': '{% extends "base.html" %}{% block content %}{{ block.super }} loader1{% endblock %}',
}],
['django.template.loaders.locmem.Loader', {
'base.html': '{% block content %}loader2{% endblock %}',
}],
]
)
template = engine.get_template('base.html')
output = template.render(Context({}))
self.assertEqual(output.strip(), 'loader2 loader1')
def test_block_override_in_extended_included_template(self):
"""
ExtendsNode.find_template() initializes history with self.origin
(#28071).
"""
engine = Engine(
loaders=[
['django.template.loaders.locmem.Loader', {
'base.html': "{% extends 'base.html' %}{% block base %}{{ block.super }}2{% endblock %}",
'included.html':
"{% extends 'included.html' %}{% block included %}{{ block.super }}B{% endblock %}",
}],
['django.template.loaders.locmem.Loader', {
'base.html': "{% block base %}1{% endblock %}{% include 'included.html' %}",
'included.html': "{% block included %}A{% endblock %}",
}],
],
)
template = engine.get_template('base.html')
self.assertEqual(template.render(Context({})), '12AB')
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