loader.py 文件源码

def test_caching(self):
        changed = False
        class TestLoader(loaders.BaseLoader):
            def get_source(self, environment, template):
                return u'foo', None, lambda: not changed
        env = Environment(loader=TestLoader(), cache_size=-1)
        tmpl = env.get_template('template')
        assert tmpl is env.get_template('template')
        changed = True
        assert tmpl is not env.get_template('template')
        changed = False

        env = Environment(loader=TestLoader(), cache_size=0)
        assert env.get_template('template') \
               is not env.get_template('template')

        env = Environment(loader=TestLoader(), cache_size=2)
        t1 = env.get_template('one')
        t2 = env.get_template('two')
        assert t2 is env.get_template('two')
        assert t1 is env.get_template('one')
        t3 = env.get_template('three')
        assert 'one' in env.cache
        assert 'two' not in env.cache
        assert 'three' in env.cache