code: def test_low_high_vals_work(byte_arr):
      """The high/low param vals determine the min and max of the output arr."""
  
      # Valid case. should also take care of if statements for cmin/cmax
      val_arr = es.bytescale(byte_arr, high=255, low=0)
  
      assert val_arr.min() == 0
      assert val_arr.max() == 255
  
file_path: earthpy/earthpy/tests/test_bytescale.py
imports: import pytest
  import numpy
  import earthpy.spatial
label_desc: Use image node_id 6 for calling a global function with example usage: test_low_high_vals_work(byte_arr) without return types