code: def test_faiss_not_installed(self, monkeypatch):
      def mock_load(*args, **kwargs):
          return ["mock"]
  
      monkeypatch.setattr(
          "argilla.labeling.text_classification.weak_labels.load",
          mock_load,
      )
      monkeypatch.setitem(sys.modules, "faiss", None)
      with pytest.raises(
          ModuleNotFoundError, match="pip install faiss-cpu"
      ):
          weak_labels = WeakLabelsBase(
              rules=[lambda x: "mock"] * 2, dataset="mock"
          )
          weak_labels._find_dists_and_nearest(None, None, None, None)
  
imports: import sys
  from typing import Callable, List, Optional, Union
  import numpy
  import pandas
  import pytest
  from argilla.client.models import TextClassificationRecord
  from argilla.client.sdk.text_classification.models import CreationTextClassificationRecord, TextClassificationBulkData
  from argilla.labeling.text_classification import WeakLabels, WeakMultiLabels
  from argilla.labeling.text_classification.rule import Rule
  from argilla.labeling.text_classification.weak_labels import DuplicatedRuleNameError, MissingLabelError, MultiLabelError, NoRecordsFoundError, NoRulesFoundError, WeakLabelsBase
  from argilla.server.commons.models import TaskType
  from pandas.testing import assert_frame_equal
  from tests.integration.helpers import SecuredClient
label_desc: Use image node_id 8 for calling the TestWeakLabelsBase obj's underlying member method code with example usage: obj.test_faiss_not_installed(monkeypatch) and returns: list