code: def test_unit_vdist(lat, lon, lat1, lon1, srange, az):
      dist, az1 = vincenty.vdist(lat, lon, lat1, lon1)
      assert dist == approx(srange, rel=0.005)
      assert az1 == approx(az)
  
      assert isinstance(dist, float)
      assert isinstance(az1, float)
  
imports: import pymap3d.vincenty
  import pytest
  from pytest import approx
label_desc: Use image node_id 1 for calling a global function with example usage: test_unit_vdist(lat, lon, lat1, lon1, srange, az) without return types