code: def testToDense(self, fmt):
      M = jnp.arange(4).reshape(2, 2)
      if fmt == "BCOO":
          Msp = BCOO.fromdense(M)
      elif fmt == "BCSR":
          Msp = BCSR.fromdense(M)
      else:
          raise ValueError(f"Unrecognized {fmt=}")
  
      @self.sparsify
      def func(M):
          return todense(M) + 1
  
      self.assertArraysEqual(func(M), M + 1)
      self.assertArraysEqual(func(Msp), M + 1)
      self.assertArraysEqual(jit(func)(M), M + 1)
      self.assertArraysEqual(jit(func)(Msp), M + 1)
  
imports: from functools import partial
  import math
  import operator
  from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  import jax
  from jax import config, jit, lax
  import jax.numpy
  import jax._src.test_util
  from jax.experimental.sparse import BCOO, BCSR, sparsify, todense, SparseTracer
  from jax.experimental.sparse.transform import arrays_to_spvalues, spvalues_to_arrays, sparsify_raw, SparsifyValue, SparsifyEnv
  from jax.experimental.sparse.util import CuSparseEfficiencyWarning
  from jax.experimental.sparse import test_util
label_desc: Use image node_id 30 for calling the SparsifyTest obj's underlying member method code with example usage: obj.testToDense(fmt) and returns: unknown