text: import pytest
  
  from landlab import RasterModelGrid
  from landlab.components.vegetation_dynamics.vegetation_dynamics import Vegetation
  
  
  @pytest.fixture
  def veg():
      grid = RasterModelGrid((20, 20), xy_spacing=10e0)
      grid.add_zeros("vegetation__plant_functional_type", at="cell", dtype=int)
      return Vegetation(grid)
  