code: def test_search_prefix_proj_data(mock_fhs):
      """Find GDAL data under prefix"""
      finder = PROJDataFinder()
      assert finder.search_prefix(str(mock_fhs)) == str(
          mock_fhs.join("share").join("proj")
      )
  
imports: from unittest import mock
  import pytest
  from fiona._env import GDALDataFinder, PROJDataFinder
  from .conftest import gdal_version
label_desc: Use image node_id 16 for calling a global function with example usage: test_search_prefix_proj_data(mock_fhs) without return types