code: def test_sparse_signature(doc):
      pytest.importorskip("scipy")
      assert (
          doc(m.sparse_copy_r)
          == """
          sparse_copy_r(arg0: scipy.sparse.csr_matrix[numpy.float32]) -> scipy.sparse.csr_matrix[numpy.float32]
      """
      )
      assert (
          doc(m.sparse_copy_c)
          == """
          sparse_copy_c(arg0: scipy.sparse.csc_matrix[numpy.float32]) -> scipy.sparse.csc_matrix[numpy.float32]
      """
      )
  
imports: import pytest
  from pybind11_tests import ConstructorStats
label_desc: Use image node_id 28 for calling a global function with example usage: test_sparse_signature(doc) without return types