code: def test_vectorfield_color_op(self):
      vectorfield = VectorField(
          [
              (0, 0, 0, 1, "#000"),
              (0, 1, 0, 1, "#F00"),
              (0, 2, 0, 1, "#0F0"),
          ],
          vdims=["A", "M", "color"],
      ).opts(color="color")
      plot = bokeh_renderer.get_plot(vectorfield)
      cds = plot.handles["cds"]
      glyph = plot.handles["glyph"]
      self.assertEqual(
          cds.data["color"],
          np.array(
              [
                  "#000",
                  "#F00",
                  "#0F0",
                  "#000",
                  "#F00",
                  "#0F0",
                  "#000",
                  "#F00",
                  "#0F0",
              ]
          ),
      )
      self.assertEqual(
          property_to_dict(glyph.line_color), {"field": "color"}
      )
  
file_path: holoviews/holoviews/tests/plotting/bokeh/test_vectorfieldplot.py
imports: import numpy
  from holoviews.element import VectorField
  from holoviews.plotting.bokeh.util import property_to_dict
  from ..utils import ParamLogStream
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 1 for calling the TestVectorFieldPlot obj's underlying member method code with example usage: obj.test_vectorfield_color_op() without return types