code: def test_kvp_add_to_empty():
      ks = np.empty(10, dtype=np.int32)
      vs = np.empty(10)
  
      # insert an item
      n = kvp_minheap_insert(0, 0, 10, 5, 3.0, ks, vs)
  
      # ep has moved
      assert n == 1
  
      # item is there
      assert ks[0] == 5
      assert vs[0] == 3.0
  
file_path: lkpy/tests/test_util_accum.py
imports: import numpy
  from lenskit.util.accum import kvp_minheap_insert, kvp_minheap_sort
  from hypothesis import given, assume, settings
  import hypothesis.strategies
  import hypothesis.extra.numpy
label_desc: Use image node_id 1 for calling a global function with example usage: test_kvp_add_to_empty() without return types