docstr: Test to_upsample
docstr_tok: ["Test","to_upsample"]
code: def test_to_interpolate(self):
      """Test to_upsample"""
      for x in [
          "nearest",
          "linear",
          "bilinear",
          "trilinear",
          "triangle",
          "cubic",
          "bicubic",
          "tricubic",
          "lanczos3",
          "lanczos5",
      ]:
          self.assertEqual(objax.util.to_interpolate(x), x)
  
file_path: objax/tests/util.py
imports: import re
  import unittest
  import objax
label_desc: Use image node_id 8 for calling the TestUtil obj's underlying member method code with example usage: obj.test_to_interpolate() without return types