fix DictLoader `uptodate` callback

2 files changed, 8 insertions, 1 deletions

diff --git a/jinja2/loaders.py b/jinja2/loaders.py
index c90bbe7..bd40929 100644
--- a/jinja2/loaders.py
+++ b/jinja2/loaders.py
@@ -274,7 +274,7 @@ class DictLoader(BaseLoader):
     def get_source(self, environment, template):
         if template in self.mapping:
             source = self.mapping[template]
-            return source, None, lambda: source != self.mapping.get(template)
+            return source, None, lambda: source == self.mapping.get(template)
         raise TemplateNotFound(template)
 
     def list_templates(self):
diff --git a/jinja2/testsuite/loader.py b/jinja2/testsuite/loader.py
index f62ec92..9368698 100644
--- a/jinja2/testsuite/loader.py
+++ b/jinja2/testsuite/loader.py
@@ -93,6 +93,13 @@ class LoaderTestCase(JinjaTestCase):
         assert 'two' not in env.cache
         assert 'three' in env.cache
 
+    def test_dict_loader_cache_invalidates(self):
+        mapping = {'foo': "one"}
+        env = Environment(loader=loaders.DictLoader(mapping))
+        assert env.get_template('foo').render() == "one"
+        mapping['foo'] = "two"
+        assert env.get_template('foo').render() == "two"
+
     def test_split_template_path(self):
         assert split_template_path('foo/bar') == ['foo', 'bar']
         assert split_template_path('./foo/bar') == ['foo', 'bar']