code: def test_charr(self):
      mt = hl.import_vcf(resource("sample.vcf"))
      es = mt.select_rows().entries()
      charr = hl.compute_charr(mt, ref_AF=0.9)
      d = charr.aggregate(
          hl.dict(hl.agg.collect((charr.s, charr.charr)))
      )
  
      assert pytest.approx(d["C1046::HG02024"], abs=0.0001) == 0.00126
      assert pytest.approx(d["C1046::HG02025"], abs=0.0001) == 0.00124
  
imports: import unittest
  import hail
  import hail.expr.aggregators
  from hail.utils.misc import new_temp_file
  from ..helpers import *
  from hail.methods.qc import VEPConfigGRCh37Version85, VEPConfigGRCh38Version95
label_desc: Use image node_id 17 for calling the Tests obj's underlying member method code with example usage: obj.test_charr() without return types