add tests for {% chunk %} template tag

chunks/tests.py

@@ -1,6 +1,68 @@
 from django.test import TestCase
+from django.template import Context, Template, TemplateSyntaxError
+from django.core.cache import cache
+
+from chunks.models import Chunk
 
 class ChuckTemplateTagTestCase(TestCase):
 
-    def test_should_pass(self):
-        assert 1
+    def setUp(self):
+        self.home_page_left = Chunk.objects.create(
+            key='home_page_left',
+            content='This is the content for left box')
+        cache.delete('cache_home_page_left')
+
+
+    def test_should_render_content_from_key(self):
+        result = self.render_template('{% load chunks %}'
+                                      '<div>{% chunk "home_page_left" %}</div>')
+
+        self.assertEquals('<div>This is the content for left box</div>', result)
+
+
+    def test_should_render_empty_string_if_key_not_found(self):
+        result = self.render_template('{% load chunks %}'
+                                      '<div>{% chunk "key_not_found" %}</div>')
+
+        self.assertEquals('<div></div>', result)
+
+
+    def test_should_cache_rendered_content(self):
+        cache_key = 'chunk_home_page_left'
+        self.assertFalse(cache.get(cache_key), "key %r should NOT be cached" % cache_key)
+
+        self.render_template("{% load chunks %}"
+                             "<div>{% chunk 'home_page_left' 10 %}</div>")
+        cached_result = cache.get(cache_key)
+
+        self.assertTrue(cached_result, "key %r should be cached" % cache_key)
+        self.assertEquals('This is the content for left box', cached_result.content)
+
+
+    def test_should_fail_if_wrong_number_of_arguments(self):
+        with self.assertRaisesRegexp(TemplateSyntaxError, "'chunk' tag should have either 2 or 3 arguments"):
+            self.render_template('{% load chunks %}'
+                                 '{% chunk %}')
+
+        with self.assertRaisesRegexp(TemplateSyntaxError, "'chunk' tag should have either 2 or 3 arguments"):
+            self.render_template('{% load chunks %}'
+                                 '{% chunk "home_page_left" 10 "invalid" %}')
+
+        with self.assertRaisesRegexp(TemplateSyntaxError, "'chunk' tag should have either 2 or 3 arguments"):
+            self.render_template('{% load chunks %}'
+                                 '{% chunk "home_page_left" 10 too much invalid arguments %}')
+
+
+    def test_should_fail_if_key_not_quoted(self):
+        with self.assertRaisesRegexp(TemplateSyntaxError, "'chunk' tag's argument should be in quotes"):
+            self.render_template('{% load chunks %}'
+                                 '{% chunk home_page_left %}')
+
+        with self.assertRaisesRegexp(TemplateSyntaxError, "'chunk' tag's argument should be in quotes"):
+            self.render_template('{% load chunks %}'
+                                 '{% chunk "home_page_left\' %}')
+
+
+    def render_template(self, content_string, context={}):
+        template = Template(content_string)
+        return template.render(Context(context))

runtests.py

@@ -10,6 +10,11 @@
             'NAME': os.path.join(os.path.dirname(__file__), 'testdb.sqlite'),
             }
         },
+    CACHES = {
+        'default': {
+            'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
+            }
+        },
     INSTALLED_APPS = ('chunks',)
 )