New test for the method serialize_model

Author: n0nSmoker

tests/test_serializer_serialize_model__function.py

@@ -0,0 +1,30 @@
+import pytest
+
+from tests.models import FlatModel, NestedModel
+
+
+@pytest.fixture
+def test_model(get_instance):
+    model = get_instance(NestedModel)
+    model.model = get_instance(FlatModel)
+    return model
+
+
+# TODO: Add more checks of model fields
+@pytest.mark.parametrize(
+    "only, expected",
+    [
+        # FIXME: last `key` ignored and all the rist is returned is it expected?
+        # (("model.list.key",), {"model": {"list": [{"key": 123}]}}),
+        (("dict.key",), {"dict": {"key": 123}}),
+        (("bool",), {"bool": False}),
+        (("null",), {"null": None}),  # FIXME: Invalid JSON
+    ],
+)
+def test_serializer_serialize_model__fork_success(
+    get_serializer, test_model, only, expected
+):
+    serializer = get_serializer()
+    serializer.schema.update(only=only)
+    result = serializer.serialize_model(test_model)
+    assert result == expected