diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 0000000..4522608
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,3 @@
+[pytest]
+testpaths = tests
+addopts = --cov=s2python --cov-report=html:./unit_test_coverage/ -v tests/unit/ 
diff --git a/src/s2python/generated/gen_s2.py b/src/s2python/generated/gen_s2.py
index f09a9f6..22dd0f7 100644
--- a/src/s2python/generated/gen_s2.py
+++ b/src/s2python/generated/gen_s2.py
@@ -180,6 +180,7 @@ class NumberRange(BaseModel):
 class Transition(BaseModel):
     model_config = ConfigDict(
         extra="forbid",
+        populate_by_name=True
     )
     id: ID = Field(
         ...,
diff --git a/tests/unit/message_test.py b/tests/unit/message_test.py
index f667306..1d3c4a9 100644
--- a/tests/unit/message_test.py
+++ b/tests/unit/message_test.py
@@ -61,3 +61,5 @@ def test_import_s2_messages__pebc(self):
 
     def test_import_s2_messages__ppbc(self):
         self._test_import_s2_messages("s2python.ppbc")
+    def test_import_s2_messages__ombc(self):
+        self._test_import_s2_messages("s2python.ombc")