[Python] Set example creation time to experiment start time (#765)

For unit testing.

Also fix issue where test suite name isn't being honored

python/langsmith/_testing.py

@@ -409,10 +409,13 @@ def experiment(self):
 
     @classmethod
     def from_test(
-        cls, client: Optional[ls_client.Client], func: Callable
+        cls,
+        client: Optional[ls_client.Client],
+        func: Callable,
+        test_suite_name: Optional[str] = None,
     ) -> _LangSmithTestSuite:
         client = client or ls_client.Client()
-        test_suite_name = _get_test_suite_name(func)
+        test_suite_name = test_suite_name or _get_test_suite_name(func)
         with cls._lock:
             if not cls._instances:
                 cls._instances = {}
@@ -496,6 +499,7 @@ def _sync_example(
                 outputs=outputs_,
                 dataset_id=self.id,
                 metadata=metadata,
+                created_at=self._experiment.start_time,
             )
         if example.modified_at:
             self.update_version(example.modified_at)
@@ -531,7 +535,9 @@ def _ensure_example(
     if output_keys:
         for k in output_keys:
             outputs[k] = inputs.pop(k, None)
-    test_suite = _LangSmithTestSuite.from_test(client, func)
+    test_suite = _LangSmithTestSuite.from_test(
+        client, func, langtest_extra.get("test_suite_name")
+    )
     example_id, example_name = _get_id(func, inputs, test_suite.id)
     example_id = langtest_extra["id"] or example_id
     test_suite.sync_example(

python/pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langsmith"
-version = "0.1.72"
+version = "0.1.73"
 description = "Client library to connect to the LangSmith LLM Tracing and Evaluation Platform."
 authors = ["LangChain <support@langchain.dev>"]
 license = "MIT"

python/tests/evaluation/test_evaluation.py

@@ -136,7 +136,7 @@ def test_bar_parametrized(x, y, z):
     return {"z": x + y}
 
 
-@unit
+@unit(test_suite_name="tests.evaluation.test_evaluation::test_foo_async_parametrized")
 @pytest.mark.parametrize("x, y", [(1, 2), (2, 3)])
 async def test_foo_async_parametrized(x, y):
     await asyncio.sleep(0.1)