Remove a useless file

tests/main.py

-#!/usr/bin/python3
-
-import unittest
-
-class TestCleaning(unittest.TestCase):
-    def test_pdf(self):
-        self.assertEqual('foo'.upper(), 'FOO')
-
-    def test_isupper(self):
-        self.assertTrue('FOO'.isupper())
-        self.assertFalse('Foo'.isupper())
-
-    def test_split(self):
-        s = 'hello world'
-        self.assertEqual(s.split(), ['hello', 'world'])
-        # check that s.split fails when the separator is not a string
-        with self.assertRaises(TypeError):
-            s.split(2)
-
-
-if __name__ == '__main__':
-    unittest.main()