community: fixed critical bugs at Writer provider (#27879)

libs/community/tests/integration_tests/llms/test_writer.py

@@ -1,10 +0,0 @@
-"""Test Writer API wrapper."""
-
-from langchain_community.llms.writer import Writer
-
-
-def test_writer_call() -> None:
-    """Test valid call to Writer."""
-    llm = Writer()
-    output = llm.invoke("Say foo:")
-    assert isinstance(output, str)