code: def test_sparse():
      pytest.importorskip("scipy")
      assert_sparse_equal_ref(m.sparse_r())
      assert_sparse_equal_ref(m.sparse_c())
      assert_sparse_equal_ref(m.sparse_copy_r(m.sparse_r()))
      assert_sparse_equal_ref(m.sparse_copy_c(m.sparse_c()))
      assert_sparse_equal_ref(m.sparse_copy_r(m.sparse_c()))
      assert_sparse_equal_ref(m.sparse_copy_c(m.sparse_r()))
  
imports: import pytest
  from pybind11_tests import ConstructorStats
label_desc: Use image node_id 27 for calling a global function with example usage: test_sparse() without return types