Add UT

python/tests/unit_tests/test_testing.py

@@ -0,0 +1,12 @@
+from langsmith._testing import _serde_example_values
+
+
+def test__serde_example_values():
+    class Foo:
+        def __init__(self, a, b):
+            self.a = a
+            self.b = b
+
+    results = _serde_example_values({"foo": Foo(1, 2)})
+    assert "foo" in results
+    assert isinstance(results["foo"], str)