diff --git a/tests/materializer/test_materializer_default_values.py b/tests/materializer/test_materializer_default_values.py
new file mode 100644
index 0000000..2b281d0
--- /dev/null
+++ b/tests/materializer/test_materializer_default_values.py
@@ -0,0 +1,148 @@
+import pytest
+from graphty import ConfigDict, ModelMaterializer
+from pydantic import BaseModel, Field
+from tests.materializer.param import Expected, Parameter
+
+data = [
+    {"a": 1},
+    {"a": 2},
+    {"a": 3},
+]
+
+
+class Model1(BaseModel):
+    a: int
+    b: int = 1
+    c: int = Field(default_factory=lambda: 2)
+    d: int = Field(default_factory=lambda data: 3)
+
+
+class Model2(BaseModel):
+    model_config = ConfigDict(group_by="a")
+
+    a: int
+    b: int = 1
+    c: int = Field(default_factory=lambda: 2)
+    d: int = Field(default_factory=lambda data: 3)
+
+
+class Model3(BaseModel):
+    nested: Model1
+
+
+class Model4(BaseModel):
+    model_config = ConfigDict(group_by="a")
+
+    a: int
+    nested: Model1
+
+
+class Model5(BaseModel):
+    nested: Model2
+
+
+class Model6(BaseModel):
+    model_config = ConfigDict(group_by="a")
+
+    a: int
+    nested: Model2
+
+
+class Model7(BaseModel):
+    x: int = 1
+
+
+params: list[Parameter] = [
+    Parameter(
+        kwargs={"model": Model1, "data": data},
+        expected=Expected(
+            bindings=[{"a": 1}, {"a": 2}, {"a": 3}],
+            model_dump=[
+                {"a": 1, "b": 1, "c": 2, "d": 3},
+                {"a": 2, "b": 1, "c": 2, "d": 3},
+                {"a": 3, "b": 1, "c": 2, "d": 3},
+            ],
+        ),
+    ),
+    Parameter(
+        kwargs={"model": Model2, "data": data},
+        expected=Expected(
+            bindings=[{"a": 1}, {"a": 2}, {"a": 3}],
+            model_dump=[
+                {"a": 1, "b": 1, "c": 2, "d": 3},
+                {"a": 2, "b": 1, "c": 2, "d": 3},
+                {"a": 3, "b": 1, "c": 2, "d": 3},
+            ],
+        ),
+    ),
+    Parameter(
+        kwargs={"model": Model3, "data": data},
+        expected=Expected(
+            bindings=[{"nested": {"a": 1}}, {"nested": {"a": 2}}, {"nested": {"a": 3}}],
+            model_dump=[
+                {"nested": {"a": 1, "b": 1, "c": 2, "d": 3}},
+                {"nested": {"a": 2, "b": 1, "c": 2, "d": 3}},
+                {"nested": {"a": 3, "b": 1, "c": 2, "d": 3}},
+            ],
+        ),
+    ),
+    Parameter(
+        kwargs={"model": Model4, "data": data},
+        expected=Expected(
+            bindings=[
+                {"a": 1, "nested": {"a": 1}},
+                {"a": 2, "nested": {"a": 2}},
+                {"a": 3, "nested": {"a": 3}},
+            ],
+            model_dump=[
+                {"a": 1, "nested": {"a": 1, "b": 1, "c": 2, "d": 3}},
+                {"a": 2, "nested": {"a": 2, "b": 1, "c": 2, "d": 3}},
+                {"a": 3, "nested": {"a": 3, "b": 1, "c": 2, "d": 3}},
+            ],
+        ),
+    ),
+    Parameter(
+        kwargs={"model": Model5, "data": data},
+        expected=Expected(
+            bindings=[{"nested": {"a": 1}}, {"nested": {"a": 2}}, {"nested": {"a": 3}}],
+            model_dump=[
+                {"nested": {"a": 1, "b": 1, "c": 2, "d": 3}},
+                {"nested": {"a": 2, "b": 1, "c": 2, "d": 3}},
+                {"nested": {"a": 3, "b": 1, "c": 2, "d": 3}},
+            ],
+        ),
+    ),
+    Parameter(
+        kwargs={"model": Model6, "data": data},
+        expected=Expected(
+            bindings=[
+                {"a": 1, "nested": {"a": 1}},
+                {"a": 2, "nested": {"a": 2}},
+                {"a": 3, "nested": {"a": 3}},
+            ],
+            model_dump=[
+                {"a": 1, "nested": {"a": 1, "b": 1, "c": 2, "d": 3}},
+                {"a": 2, "nested": {"a": 2, "b": 1, "c": 2, "d": 3}},
+                {"a": 3, "nested": {"a": 3, "b": 1, "c": 2, "d": 3}},
+            ],
+        ),
+    ),
+    Parameter(
+        kwargs={"model": Model7, "data": []},
+        expected=Expected(
+            bindings=[],
+            model_dump=[],
+        ),
+    ),
+]
+
+
+@pytest.mark.parametrize("param", params)
+def test_materializer_basic_aliasing(param):
+    materializer = ModelMaterializer(**param.kwargs)
+
+    bindings = list(materializer.generate_bindings())
+    model_dump = [model.model_dump() for model in materializer.generate_models()]
+
+    assert bindings == param.expected.bindings
+    assert model_dump == param.expected.model_dump