code: def test_suite():
      """
      Run all tests.
      """
      loader = unittest.TestLoader()
      suite = unittest.TestSuite()
      suite.addTest(loader.loadTestsFromTestCase(TestToMatrix))
      suite.addTest(loader.loadTestsFromTestCase(TestToMatrixWithInfo))
      return suite
  
imports: import unittest
  import pandas
  import numpy
  from mlpack.matrix_utils import to_matrix
  from mlpack.matrix_utils import to_matrix_with_info
label_desc: Use image node_id 1 for calling a global function with example usage: test_suite() and returns: suite