code: def test_invalid_column():
      data = {
          "col1": [
              pd.Timestamp(1),
              pd.Timestamp(2000000),
              "Deep",
              "deep",
              "earth",
              "foo",
              "bar",
              "dog",
          ]
      }
      df = pd.DataFrame(data=data)
      # Act
      result = StringMismatch().run(df).value
      # Assert
      assert_that(result["columns"], has_length(0))
  
imports: import numpy
  import pandas
  from hamcrest import assert_that, close_to, greater_than, has_entries, has_entry, has_items, has_length
  from deepchecks.core import ConditionCategory
  from deepchecks.tabular.checks.data_integrity import StringMismatch
  from deepchecks.tabular.dataset import Dataset
  from tests.base.utils import equal_condition_result
label_desc: Use image node_id 16 for calling a global function with example usage: test_invalid_column() without return types