code: def test_parses(self):
      backend = Env.spark_backend("BlockMatrixIRTests.test_parses")
  
      bmir = hl.linalg.BlockMatrix.fill(1, 1, 0.0)._bmir
      backend.execute(
          ir.BlockMatrixWrite(
              bmir, ir.BlockMatrixPersistWriter("x", "MEMORY_ONLY")
          )
      )
      persist = ir.BlockMatrixRead(
          ir.BlockMatrixPersistReader("x", bmir)
      )
  
      for x in self.blockmatrix_irs() + [persist]:
          backend._parse_blockmatrix_ir(str(x))
  
imports: import re
  import unittest
  import numpy
  from numpy.testing import assert_array_equal
  import hail
  import hail.ir
  from hail.ir.renderer import CSERenderer
  from hail.expr import construct_expr
  from hail.expr.types import tint32
  from hail.utils.java import Env
  from hail.utils import new_temp_file
  from test.hail.helpers import *
label_desc: Use image node_id 2 for calling the BlockMatrixIRTests obj's underlying member method code with example usage: obj.test_parses() without return types