code: def test_format_float_fixed():
      out = format_float_fixed(0.0)
      assert out == "0.0000"
      out = format_float_fixed(1.23e-9)
      assert out == "1.2300e-09"
      out = format_float_fixed(123456789.0)
      assert out == "1.2346e+08"
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_format_float_fixed() without return types