chore: Add kokoro config files for langchain template unit tests

PiperOrigin-RevId: 624975886

Author: yeesian

.kokoro/presubmit/unit_langchain_py310.cfg

@@ -0,0 +1,13 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Run unit tests for LangChain on Python 3.10
+env_vars: {
+    key: "NOX_SESSION"
+    value: "unit_langchain-3.10"
+}
+
+# Run unit tests in parallel, splitting up by file
+env_vars: {
+    key: "PYTEST_ADDOPTS"
+    value: "-n=auto --dist=loadscope"
+}

.kokoro/presubmit/unit_langchain_py311.cfg

@@ -0,0 +1,13 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Run unit tests for LangChain on Python 3.11
+env_vars: {
+    key: "NOX_SESSION"
+    value: "unit_langchain-3.11"
+}
+
+# Run unit tests in parallel, splitting up by file
+env_vars: {
+    key: "PYTEST_ADDOPTS"
+    value: "-n=auto --dist=loadscope"
+}

.kokoro/presubmit/unit_langchain_py38.cfg

@@ -0,0 +1,13 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Run unit tests for LangChain on Python 3.8
+env_vars: {
+    key: "NOX_SESSION"
+    value: "unit_langchain-3.8"
+}
+
+# Run unit tests in parallel, splitting up by file
+env_vars: {
+    key: "PYTEST_ADDOPTS"
+    value: "-n=auto --dist=loadscope"
+}

.kokoro/presubmit/unit_langchain_py39.cfg

@@ -0,0 +1,13 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Run unit tests for LangChain on Python 3.9
+env_vars: {
+    key: "NOX_SESSION"
+    value: "unit_langchain-3.9"
+}
+
+# Run unit tests in parallel, splitting up by file
+env_vars: {
+    key: "PYTEST_ADDOPTS"
+    value: "-n=auto --dist=loadscope"
+}

setup.py

@@ -156,6 +156,10 @@
     "langchain-google-vertexai < 0.2",
 ]
 
+langchain_testing_extra_require = langchain_extra_require + [
+    "pytest-xdist",
+]
+
 full_extra_require = list(
     set(
         tensorboard_extra_require
@@ -260,7 +264,7 @@
         "reasoningengine": reasoning_engine_extra_require,
         "rapid_evaluation": rapid_evaluation_extra_require,
         "langchain": langchain_extra_require,
-        "langchain_testing": langchain_extra_require,
+        "langchain_testing": langchain_testing_extra_require,
     },
     python_requires=">=3.8",
     classifiers=[