new_contents: from AlphaTwirl.Configure import TableFileNameComposer
  import unittest
  
  ##__________________________________________________________________||
  class TestTableFileNameComposer(unittest.TestCase):
  
      def test_one(self):
          compose = TableFileNameComposer()
          actual = compose(
              columnNames = ('var1', 'var2', 'var3'),
              indices = (1, None, 2)
          )
          self.assertEqual("tbl_component_var1_1_var2_var3_2.txt", actual)
  
  ##__________________________________________________________________||
  
subject: add a new test case TestTableFileNameComposer