code: def test_pivot():
      test_df = pd.DataFrame(
          {
              "foo": ["one", "one", "one", "two", "two", "two"],
              "bar": ["A", "B", "C", "A", "B", "C"],
              "baz": [1, 2, 3, 4, 5, 6],
              "zoo": ["x", "y", "z", "q", "w", "t"],
          }
      )
  
      df = pd.pivot(test_df, index="foo", columns="bar", values="baz")
      assert isinstance(df, pd.DataFrame)
  
      with pytest.raises(ValueError):
          pd.pivot(
              test_df["bar"], index="foo", columns="bar", values="baz"
          )
  
file_path: ray/python/ray/tests/modin/test_modin.py
imports: import sys
  import pytest
  import pandas
  import numpy
  from numpy.testing import assert_array_equal
  from ray.tests.conftest import ray_start_regular_shared
label_desc: Use image node_id 7 for calling a global function with example usage: test_pivot() without return types