add default parameter to groupby

1 files changed, 15 insertions, 0 deletions

diff --git a/tests/test_filters.py b/tests/test_filters.py
index 2c119c3..0843246 100644
--- a/tests/test_filters.py
+++ b/tests/test_filters.py
@@ -593,6 +593,21 @@ class TestFilter:
             "",
         ]
 
+    def test_groupby_default(self, env):
+        tmpl = env.from_string(
+            "{% for city, items in users|groupby('city', default='NY') %}"
+            "{{ city }}: {{ items|map(attribute='name')|join(', ') }}\n"
+            "{% endfor %}"
+        )
+        out = tmpl.render(
+            users=[
+                {"name": "emma", "city": "NY"},
+                {"name": "smith", "city": "WA"},
+                {"name": "john"},
+            ]
+        )
+        assert out == "NY: emma, john\nWA: smith\n"
+
     def test_filtertag(self, env):
         tmpl = env.from_string(
             "{% filter upper|replace('FOO', 'foo') %}foobar{% endfilter %}"