docstr: Test that a single-column empty DataFrame can be constructed
  from an empty numpy array.
docstr_tok: ["Test","that","a","single-column","empty","DataFrame","can","be","constructed","from","an","empty","numpy","array","."]
code: def test_empty_numpy_array(self):
      """Test that a single-column empty DataFrame can be constructed
      from an empty numpy array.
      """
      arr = np.array([])
      df = type_util.convert_anything_to_df(arr)
      self.assertEqual(type(df), pd.DataFrame)
      self.assertEqual(df.shape, (0, 1))
  
file_path: streamlit/lib/tests/streamlit/dataframe_coercion_test.py
imports: import unittest
  import numpy
  import pandas
  import pyarrow
  from streamlit import type_util
label_desc: Use image node_id 2 for calling the DataFrameCoercionTest obj's underlying member method code with example usage: obj.test_empty_numpy_array() without return types