Improve cols coverage

tests/test_tuples.py

@@ -69,19 +69,25 @@ class Test(NamedTuple):
 def test_simple_dict_nametuples(genconverter: Converter):
     """Namedtuples can be un/structured to/from dicts."""
 
+    class TestInner(NamedTuple):
+        a: int
+
     class Test(NamedTuple):
         a: int
         b: str = "test"
+        c: TestInner = TestInner(1)
 
     genconverter.register_unstructure_hook_factory(
-        lambda t: t is Test, namedtuple_dict_unstructure_factory
+        lambda t: t in (Test, TestInner), namedtuple_dict_unstructure_factory
     )
     genconverter.register_structure_hook_factory(
-        lambda t: t is Test, namedtuple_dict_structure_factory
+        lambda t: t in (Test, TestInner), namedtuple_dict_structure_factory
     )
 
-    assert genconverter.unstructure(Test(1)) == {"a": 1, "b": "test"}
-    assert genconverter.structure({"a": 1, "b": "2"}, Test) == Test(1, "2")
+    assert genconverter.unstructure(Test(1)) == {"a": 1, "b": "test", "c": {"a": 1}}
+    assert genconverter.structure({"a": 1, "b": "2"}, Test) == Test(
+        1, "2", TestInner(1)
+    )
 
     # Defaults work.
     assert genconverter.structure({"a": 1}, Test) == Test(1, "test")