#!/usr/bin/env python
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"""Tests for util module."""


import os
import sys
import unittest

import config  # This must be imported before mod_pywebsocket.
from mod_pywebsocket import util

_TEST_DATA_DIR = os.path.join(os.path.split(__file__)[0], 'testdata')

class UtilTest(unittest.TestCase):
    def test_get_stack_trace(self):
        self.assertEqual('None\n', util.get_stack_trace())
        try:
            a = 1 / 0  # Intentionally raise exception.
        except Exception:
            trace = util.get_stack_trace()
            self.failUnless(trace.startswith('Traceback'))
            self.failUnless(trace.find('ZeroDivisionError') != -1)

    def test_prepend_message_to_exception(self):
        exc = Exception('World')
        self.assertEqual('World', str(exc))
        util.prepend_message_to_exception('Hello ', exc)
        self.assertEqual('Hello World', str(exc))

    def test_get_script_interp(self):
        cygwin_path = 'c:\\cygwin\\bin'
        cygwin_perl = os.path.join(cygwin_path, 'perl')
        self.assertEqual(None, util.get_script_interp(
            os.path.join(_TEST_DATA_DIR, 'README')))
        self.assertEqual(None, util.get_script_interp(
            os.path.join(_TEST_DATA_DIR, 'README'), cygwin_path))
        self.assertEqual('/usr/bin/perl -wT', util.get_script_interp(
            os.path.join(_TEST_DATA_DIR, 'hello.pl')))
        self.assertEqual(cygwin_perl + ' -wT', util.get_script_interp(
            os.path.join(_TEST_DATA_DIR, 'hello.pl'), cygwin_path))


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


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