code: def test_coercers_can_coerce(self):
      ts = self.types_to_test()
      for t in ts:
          c = coercer_from_dtype(t)
          self.assertTrue(c.can_coerce(t))
          self.assertFalse(c.requires_conversion(t))
  
imports: from typing import Optional
  import unittest
  from hail.expr import coercer_from_dtype
  from hail.expr.types import *
  from hail.genetics import reference_genome
  from ..helpers import *
  from hail.utils.java import Env
label_desc: Use image node_id 7 for calling the Tests obj's underlying member method code with example usage: obj.test_coercers_can_coerce() without return types