test: implement empty model and default-only model mapper tests

Concerns #181.

tests/tests_mapper/params/model_bindings_mapper_parameters.py

@@ -7,6 +7,7 @@
     BasicNestedModel,
     BasicSimpleModel,
 )
+from tests.tests_mapper.params.models.empty_default_only_model import DefaultOnly, Empty
 from tests.tests_mapper.params.models.grouping_model import GroupingComplexModel
 from tests.tests_mapper.params.models.nested_grouping_model import (
     GroupingNestedComplexModel,
@@ -256,3 +257,16 @@
         ],
     ),
 ]
+
+empty_default_only_model_parameters = [
+    ModelBindingsMapperParameter(
+        model=Empty,
+        bindings=[{} for _ in range(100)],
+        expected=[{} for _ in range(100)],
+    ),
+    ModelBindingsMapperParameter(
+        model=DefaultOnly,
+        bindings=[{} for _ in range(100)],
+        expected=[{"x": 1} for _ in range(100)],
+    ),
+]

tests/tests_mapper/params/models/empty_default_only_model.py

@@ -0,0 +1,11 @@
+"""Models for testing empty/defaul-only model cases."""
+
+from pydantic import BaseModel
+
+
+class Empty(BaseModel):
+    pass
+
+
+class DefaultOnly(BaseModel):
+    x: int = 1

tests/tests_mapper/test_model_bindings_mapper.py

@@ -8,6 +8,7 @@
     author_array_collection_parameters,
     author_work_title_parameters,
     basic_parameters,
+    empty_default_only_model_parameters,
     grouping_nested_model_parameters,
     grouping_parameters,
     nested_grouping_parameters,
@@ -23,6 +24,7 @@
         *author_work_title_parameters,
         *author_array_collection_parameters,
         *grouping_nested_model_parameters,
+        *empty_default_only_model_parameters,
     ],
 )
 def test_basic_model_bindings_mapper(model, bindings, expected):