def setup_test_template_loader(templates_dict, use_cached_loader=False):
    """
    Changes Django to only find templates from within a dictionary (where each
    key is the template name and each value is the corresponding template
    content to return).

    Use meth:`restore_template_loaders` to restore the original loaders.
    """
    if hasattr(loader, RESTORE_LOADERS_ATTR):
        raise Exception("loader.%s already exists" % RESTORE_LOADERS_ATTR)

    def test_template_loader(template_name, template_dirs=None):
        "A custom template loader that loads templates from a dictionary."
        try:
            return (templates_dict[template_name], "test:%s" % template_name)
        except __HOLE__:
            raise TemplateDoesNotExist(template_name)

    if use_cached_loader:
        template_loader = cached.Loader(('test_template_loader',))
        template_loader._cached_loaders = (test_template_loader,)
    else:
        template_loader = test_template_loader

    setattr(loader, RESTORE_LOADERS_ATTR, loader.template_source_loaders)
    loader.template_source_loaders = (template_loader,)
    return template_loader
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/test/utils.py/setup_test_template_loader