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#!/usr/bin/env python
"""Tests of the db utility functions and classes."""
from cogent.util.unit_test import TestCase, main
from cogent.db.util import UrlGetter, expand_slice, last_nondigit_index
from os import remove
__author__ = "Rob Knight"
__copyright__ = "Copyright 2007-2009, The Cogent Project"
__credits__ = ["Rob Knight"]
__license__ = "GPL"
__version__ = "1.4.1"
__maintainer__ = "Rob Knight"
__email__ = "rob@spot.colorado.edu"
__status__ = "Production"
class db_util_tests(TestCase):
"""Tests of top-level functions."""
def test_last_nondigit_index(self):
"""last_nondigit_index should return i such that s[i:] is numeric"""
ldi = last_nondigit_index
self.assertEqual(ldi('3'), 0)
self.assertEqual(ldi('345'), 0)
self.assertEqual(ldi('a34'), 1)
self.assertEqual(ldi('abc234'), 3)
self.assertEqual(ldi('abcd'), None)
def test_expand_slice(self):
"""expand_slice should get accession range"""
self.assertEqual(expand_slice(slice('AF1001','AF1003')), \
['AF1001','AF1002','AF1003'])
#can't expand if accession prefixes
self.assertRaises(TypeError, expand_slice, slice('AF100:','AG1002'))
#should keep leading zeros
self.assertEqual(expand_slice(slice('AF0001','AF0003')), \
['AF0001','AF0002','AF0003'])
class UrlGetterTests(TestCase):
"""Tests of the UrlGetter class"""
def retrieval_test(self):
"""Urlgetter should init, read and retrieve"""
class Google(UrlGetter):
BaseUrl='http://www.google.com'
g = Google()
#test URL construction
self.assertEqual(str(g), 'http://www.google.com')
#test reading
text = g.read()
assert '<title>Google</title>' in text
#test file getting
fname = '/tmp/google_test'
g.retrieve(fname)
g_file = open(fname)
g_text = g_file.read()
self.assertEqual(g_text, text)
g_text.close()
remove(fname)
if __name__ == '__main__':
main()
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