code: def mock_wheel(tmpdir):
      """A fake rasterio wheel"""
      moduledir = tmpdir.mkdir("rasterio")
      moduledir.ensure("__init__.py")
      moduledir.ensure("_env.py")
      moduledir.ensure("gdal_data/header.dxf")
      moduledir.ensure("proj_data/epsg")
      return moduledir
  
imports: import pytest
  from rasterio._env import GDALDataFinder, PROJDataFinder, get_proj_data_search_paths, get_gdal_data
  from .conftest import gdal_version
label_desc: Use image node_id 1 for calling a global function with example usage: mock_wheel(tmpdir) and returns: moduledir