code: def test_fmt():
      wrap_single_fmt_test(-4.14, -4.13, "%+.3f")
      wrap_single_fmt_test(1.0, 3.0, "%+.1f")
      wrap_single_fmt_test(2000, 50000, "%+.1e")
  
file_path: ultranest/tests/test_viz.py
imports: import numpy
  from ultranest.viz import round_parameterlimits
label_desc: Use image node_id 7 for calling a global function with example usage: test_fmt() without return types