Block sockets for unit-tests (langchain-ai#4803)

# Block usage of sockets during unit tests

Catch any tests that attempt to use the network.

Makefile

@@ -35,13 +35,13 @@ lint lint_diff:
 TEST_FILE ?= tests/unit_tests/
 
 test:
-	poetry run pytest $(TEST_FILE)
+	poetry run pytest --disable-socket --allow-unix-socket $(TEST_FILE)
 
-tests:
-	poetry run pytest $(TEST_FILE)
+tests: 
+	poetry run pytest --disable-socket --allow-unix-socket $(TEST_FILE)
 
 extended_tests:
-	poetry run pytest --only-extended tests/unit_tests
+	poetry run pytest --disable-socket --allow-unix-socket --only-extended tests/unit_tests
 
 test_watch:
 	poetry run ptw --now . -- tests/unit_tests

pyproject.toml

@@ -114,6 +114,7 @@ responses = "^0.22.0"
 pytest-asyncio = "^0.20.3"
 lark = "^1.1.5"
 pytest-mock  = "^3.10.0"
+pytest-socket = "^0.6.0"
 
 [tool.poetry.group.test_integration]
 optional = true

tests/unit_tests/test_pytest_config.py

@@ -0,0 +1,9 @@
+import pytest
+import pytest_socket
+import requests
+
+
+def test_socket_disabled() -> None:
+    """This test should fail."""
+    with pytest.raises(pytest_socket.SocketBlockedError):
+        requests.get("https://www.example.com")