code: def data_pos(data_pos_neg):
      """Fixture for data with only positive values."""
      # min: 0.5, max: 3.0
      return np.abs(data_pos_neg)
  
file_path: nilearn/nilearn/plotting/tests/test_img_plotting/test_get_colorbar_and_data_ranges.py
imports: import numpy
  import pytest
  from nilearn.plotting.img_plotting import get_colorbar_and_data_ranges
label_desc: Use image node_id 2 for calling a global function with example usage: data_pos(data_pos_neg) and returns: np