code: def test_multiple_fields(self):
      # Interpolation of multiple fields in one go.
      expected_x_grid = np.array(
          [
              [-10.0, -5.0, 0.0, 5.0, 10.0],
              [-10.0, -5.0, 0.0, 5.0, 10.0],
              [-10.0, -5.0, 0.0, 5.0, 10.0],
          ]
      )
      expected_y_grid = np.array(
          [
              [5.0, 5.0, 5.0, 5.0, 5.0],
              [7.5, 7.5, 7.5, 7.5, 7.5],
              [10.0, 10.0, 10.0, 10.0, 10],
          ]
      )
      expected_s_grid = np.array(
          [
              [np.nan, 2.0, 3.0, 2.0, np.nan],
              [np.nan, 2.5, 3.5, 2.5, np.nan],
              [2.0, 3.0, 4.0, 3.0, 2.0],
          ]
      )
  
      (
          x_grid,
          y_grid,
          s_grid1,
          s_grid2,
          s_grid3,
      ) = vec_trans._interpolate_to_grid(
          5, 3, self.x, self.y, self.s, self.s, self.s
      )
  
      assert_array_equal(x_grid, expected_x_grid)
      assert_array_equal(y_grid, expected_y_grid)
      assert_array_almost_equal(s_grid1, expected_s_grid)
      assert_array_almost_equal(s_grid2, expected_s_grid)
      assert_array_almost_equal(s_grid3, expected_s_grid)
  
file_path: cartopy/lib/cartopy/tests/test_vector_transform.py
imports: import numpy
  from numpy.testing import assert_array_almost_equal, assert_array_equal
  import pytest
  import cartopy.crs
  import cartopy.vector_transform
label_desc: Use image node_id 4 for calling the Test_interpolate_to_grid obj's underlying member method code with example usage: obj.test_multiple_fields() without return types