code: def test_hash64():
      assert cityhash.hash64("0123456789") == 12631666426400459317
      assert cityhash.hash64("abacaba") == 12549660514692179516
      assert cityhash.hash64("") == 11160318154034397263
  
imports: import cityhash
  import yatest.common
label_desc: Use image node_id 3 for calling a global function with example usage: test_hash64() without return types