First off, you need to source the environment file provided in the root of the
development directory.

    . test.env

This sets the PYTHONPATH to the Pexpect development root directory. This way
the unit tests and python interpreter will import the development version of
pexpect instead of any older versions that you may have installed on the
system. Running all unit tests is as simple as sourcing test.env and then
running tools/testall.py.

The Pyunit tests are all located in the tests/ directory. To add a new unit
test all you have to do is create the file in the tests/ directory with a
filename in this format:

    test_*.py

The testall.py script in the tools/ directory will automatically add all
test_*.py files to the test suite. To create a new unit test follow the example
of one of the other test_*.py scripts. Basically, a new unit test will follow
this template:

<pre>
#!/usr/bin/env python
import pexpect
import unittest
import PexpectTestCase

# 1. Derive your test case class from PexpectTestCase.PexpectTestCase.
# 2. At the end of this script add your test case class to the suite using
#    unittest.MakeSuite.
# 3. All test case methods should be named like test_*.
class TestCaseFoo (PexpectTestCase.PexpectTestCase):
    def test_case (self):
        assert (False), "This is an example template."
    def test_case_something_else (self):
        assert (False), "This is an example template."

if __name__ == '__main__':
    unittest.main()

suite = unittest.makeSuite(TestCaseFoo,'test')
</pre>