class_docstr: Test GRIB Reader.
class_docstr_tok: ["Test","GRIB","Reader","."]
docstr: Test loading all test datasets.
docstr_tok: ["Test","loading","all","test","datasets","."]
code: def test_load_all(self, proj_params, lon_corners, lat_corners):
      """Test loading all test datasets."""
      fake_pygrib = self._get_fake_pygrib(
          proj_params, lon_corners, lat_corners
      )
      dataids = [
          DataQuery(name="t", level=100, modifiers=tuple()),
          DataQuery(name="t", level=200, modifiers=tuple()),
          DataQuery(name="t", level=300, modifiers=tuple()),
      ]
      datasets = self._get_test_datasets(dataids, fake_pygrib)
  
      assert len(datasets) == 3
      for v in datasets.values():
          assert v.attrs["units"] == "K"
          assert isinstance(v, xr.DataArray)
  
imports: import os
  import sys
  from unittest import mock
  import numpy
  import pytest
  import xarray
  from satpy.dataset import DataQuery
label_desc: Use image node_id 7 for calling the TestGRIBReader obj's underlying member method code with example usage: obj.test_load_all(proj_params, lon_corners, lat_corners) without return types