Python Ireland Nov 2010 Talk: Unit Testing
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The document discusses unit testing in Python, emphasizing its importance in code design and refactoring. It includes practical code examples and implementation of unit tests, focusing on indexing lists of dictionaries by specific fields. Additionally, it provides further reading resources and insights into the initial challenges of unit testing.
![task: Index a list of dictionaries by one of the fields
def IndexBy(d_list, field_name):
result = {}
for d in d_list:
result[d[field_name]] = d
return result](https://image.slidesharecdn.com/unittestingtalk-110222083435-phpapp02/85/Python-Ireland-Nov-2010-Talk-Unit-Testing-6-320.jpg)
![def MakePackageNameBySoname(soname): (continued...)
"""Find the package name based on the soname.
for key in parsed:
Returns a pair of pkgname, catalogname. if parsed[key]:
""" keywords_pkgname[key] = SonameToStringWithChar(parsed[key], "-")
def AddSeparator(d, sep): keywords_catalogname[key] = SonameToStringWithChar(parsed[key], "_")
"""Adds a separator based on the neighboring else:
of two digits.""" keywords_pkgname[key] = ""
dc = copy.copy(d) keywords_catalogname[key] = ""
if dc["version"]: pkgname_list = []
if (dc["basename"][-1].isdigit() keywords_pkgname = AddSeparator(keywords_pkgname, "-")
and pkgname_list.append(
dc["version"][0].isdigit()): "CSW%(basename)s%(sep)s%(version)s" % keywords_pkgname)
dc["sep"] = sep keywords_catalogname = AddSeparator(keywords_catalogname, "_")
else: catalogname_list = [
dc["sep"] = "" "%(basename)s%(sep)s%(version)s" % keywords_catalogname,
else: ]
dc["sep"] = "" return pkgname_list, catalogname_list
return dc
soname_re = re.compile(r"(?P<basename>[w+]+([.-]+[w+]+)*)"
r".so"
r"(.(?P<version>[d.]+))?"
r"$")
m = soname_re.match(soname)
if not m:
# There was no ".so" component, so it's hardo to figure out which one is
# the name, but we'll try to figure out the numeric part of the soname.
digits = "".join(re.findall(r"[0-9]+", soname))
alnum = "".join(re.findall(r"[a-zA-Z]+", soname))
parsed = {
"basename": alnum,
"version": digits,
}
else:
parsed = m.groupdict()
keywords_pkgname = {}
keywords_catalogname = {}
Real life example](https://image.slidesharecdn.com/unittestingtalk-110222083435-phpapp02/85/Python-Ireland-Nov-2010-Talk-Unit-Testing-7-320.jpg)
![task: Index a list of dictionaries by one of the fields
def IndexBy(d_list, field_name):
result = {}
for d in d_list:
result[d[field_name]] = d
return result](https://image.slidesharecdn.com/unittestingtalk-110222083435-phpapp02/85/Python-Ireland-Nov-2010-Talk-Unit-Testing-8-320.jpg)
![import example_1
def main():
d = [{"foo": "a", "bar": "b"},
{"foo": "c", "bar": "d"}]
print example_1.IndexBy(d, "foo")
if __name__ == '__main__':
main()](https://image.slidesharecdn.com/unittestingtalk-110222083435-phpapp02/85/Python-Ireland-Nov-2010-Talk-Unit-Testing-9-320.jpg)
![import unittest
import example_1
import pprint
class IndexByUnitTest(unittest.TestCase):
def testTwoElements(self):
d = [{"foo": "a", "bar": "b"},
{"foo": "c", "bar": "d"}]
pprint.pprint(example_1.IndexBy(d, "foo"))
if __name__ == '__main__':
unittest.main()](https://image.slidesharecdn.com/unittestingtalk-110222083435-phpapp02/85/Python-Ireland-Nov-2010-Talk-Unit-Testing-10-320.jpg)
![import unittest
import example_1
class IndexByUnitTest(unittest.TestCase):
def testTwoElements(self):
d = [{"foo": "a", "bar": "b"},
{"foo": "c", "bar": "d"}]
expected = {
'a': {'foo': 'a', 'bar': 'b'},
'c': {'foo': 'c', 'bar': 'd'},
}
self.assertEquals(expected, example_1.IndexBy(d, "foo"))
if __name__ == '__main__':
unittest.main()](https://image.slidesharecdn.com/unittestingtalk-110222083435-phpapp02/85/Python-Ireland-Nov-2010-Talk-Unit-Testing-11-320.jpg)
![import unittest
import example_1
class IndexByUnitTest(unittest.TestCase):
def testTwoElements(self):
d = [{"foo": "a", "bar": "b"},
{"foo": "c", "bar": "d"},
{"foo": "c", "bar": "e"}]
expected = {
'a': {'foo': 'a', 'bar': 'b'},
'c': {'foo': 'c', 'bar': 'd'},
}
self.assertEquals(expected, example_1.IndexBy(d, "foo"))
if __name__ == '__main__':
unittest.main()](https://image.slidesharecdn.com/unittestingtalk-110222083435-phpapp02/85/Python-Ireland-Nov-2010-Talk-Unit-Testing-15-320.jpg)
![task: Index a list of dictionaries by one of the fields
def IndexBy(d_list, field_name):
result = {}
for d in d_list:
result.setdefault(d[field_name], [])
result[d[field_name]].append(d)
return result](https://image.slidesharecdn.com/unittestingtalk-110222083435-phpapp02/85/Python-Ireland-Nov-2010-Talk-Unit-Testing-17-320.jpg)
![def testMakePackageNameDashesNoDashes(self):
soname = "libpyglib-2.0-python.so.0"
expected = (
['CSWlibpyglib2-0python0'],
['libpyglib2_0python0'],
)
self.assertEqual(expected,
su.MakePackageNameBySoname(soname))
def testMakePackageNameDashesNoDashesPython(self):
soname = "libpython3.1.so.1.0"
expected = (
['CSWlibpython3-1-1-0'],
['libpython3_1_1_0'],
)
self.assertEqual(expected,
su.MakePackageNameBySoname(soname))](https://image.slidesharecdn.com/unittestingtalk-110222083435-phpapp02/85/Python-Ireland-Nov-2010-Talk-Unit-Testing-19-320.jpg)
Python Ireland Nov 2010 Talk: Unit Testing
- 1. Unit testing For those seeking instant gratification Maciej Bliziński <blizinski@google.com> Python Ireland 2010-11-10
- 2. Helps the design Provides live documentation Helps refactoring
- 3. But I'm hungry right now!
- 4. I love to see my code run
- 6. task: Index a list of dictionaries by one of the fields def IndexBy(d_list, field_name): result = {} for d in d_list: result[d[field_name]] = d return result
- 7. def MakePackageNameBySoname(soname): (continued...) """Find the package name based on the soname. for key in parsed: Returns a pair of pkgname, catalogname. if parsed[key]: """ keywords_pkgname[key] = SonameToStringWithChar(parsed[key], "-") def AddSeparator(d, sep): keywords_catalogname[key] = SonameToStringWithChar(parsed[key], "_") """Adds a separator based on the neighboring else: of two digits.""" keywords_pkgname[key] = "" dc = copy.copy(d) keywords_catalogname[key] = "" if dc["version"]: pkgname_list = [] if (dc["basename"][-1].isdigit() keywords_pkgname = AddSeparator(keywords_pkgname, "-") and pkgname_list.append( dc["version"][0].isdigit()): "CSW%(basename)s%(sep)s%(version)s" % keywords_pkgname) dc["sep"] = sep keywords_catalogname = AddSeparator(keywords_catalogname, "_") else: catalogname_list = [ dc["sep"] = "" "%(basename)s%(sep)s%(version)s" % keywords_catalogname, else: ] dc["sep"] = "" return pkgname_list, catalogname_list return dc soname_re = re.compile(r"(?P<basename>[w+]+([.-]+[w+]+)*)" r".so" r"(.(?P<version>[d.]+))?" r"$") m = soname_re.match(soname) if not m: # There was no ".so" component, so it's hardo to figure out which one is # the name, but we'll try to figure out the numeric part of the soname. digits = "".join(re.findall(r"[0-9]+", soname)) alnum = "".join(re.findall(r"[a-zA-Z]+", soname)) parsed = { "basename": alnum, "version": digits, } else: parsed = m.groupdict() keywords_pkgname = {} keywords_catalogname = {} Real life example
- 8. task: Index a list of dictionaries by one of the fields def IndexBy(d_list, field_name): result = {} for d in d_list: result[d[field_name]] = d return result
- 9. import example_1 def main(): d = [{"foo": "a", "bar": "b"}, {"foo": "c", "bar": "d"}] print example_1.IndexBy(d, "foo") if __name__ == '__main__': main()
- 10. import unittest import example_1 import pprint class IndexByUnitTest(unittest.TestCase): def testTwoElements(self): d = [{"foo": "a", "bar": "b"}, {"foo": "c", "bar": "d"}] pprint.pprint(example_1.IndexBy(d, "foo")) if __name__ == '__main__': unittest.main()
- 11. import unittest import example_1 class IndexByUnitTest(unittest.TestCase): def testTwoElements(self): d = [{"foo": "a", "bar": "b"}, {"foo": "c", "bar": "d"}] expected = { 'a': {'foo': 'a', 'bar': 'b'}, 'c': {'foo': 'c', 'bar': 'd'}, } self.assertEquals(expected, example_1.IndexBy(d, "foo")) if __name__ == '__main__': unittest.main()
- 12. blizinski@workstation ~/unit-test-talk $ python2.6 example_1_test.py . ---------------------------------------------------------------------- Ran 1 test in 0.000s OK
- 13. Cultured way of playing with code
- 15. import unittest import example_1 class IndexByUnitTest(unittest.TestCase): def testTwoElements(self): d = [{"foo": "a", "bar": "b"}, {"foo": "c", "bar": "d"}, {"foo": "c", "bar": "e"}] expected = { 'a': {'foo': 'a', 'bar': 'b'}, 'c': {'foo': 'c', 'bar': 'd'}, } self.assertEquals(expected, example_1.IndexBy(d, "foo")) if __name__ == '__main__': unittest.main()
- 17. task: Index a list of dictionaries by one of the fields def IndexBy(d_list, field_name): result = {} for d in d_list: result.setdefault(d[field_name], []) result[d[field_name]].append(d) return result
- 18. Keeping a track record
- 19. def testMakePackageNameDashesNoDashes(self): soname = "libpyglib-2.0-python.so.0" expected = ( ['CSWlibpyglib2-0python0'], ['libpyglib2_0python0'], ) self.assertEqual(expected, su.MakePackageNameBySoname(soname)) def testMakePackageNameDashesNoDashesPython(self): soname = "libpython3.1.so.1.0" expected = ( ['CSWlibpython3-1-1-0'], ['libpython3_1_1_0'], ) self.assertEqual(expected, su.MakePackageNameBySoname(soname))
- 20. The trust issue Your first steps in unit testing
- 21. Hug me, I only look alien! (never mind my boxing gloves)
- 23. It's about the way pieces of code fit together
- 24. Your trust will gradually shift
- 25. Part of the development process
- 26. It's a tool which helps with some of the everyday tasks.
- 27. Further reading http://en.wikipedia.org/wiki/Unit_testing http://diveintopython.org/unit_testing/index.html Mock objects, stubs and fakes Contact Maciej Bliziński <blizinski@google.com>
- 28. References Images: http://commons.wikimedia.org/wiki/File:Pantheon_rome_inside_1-muniu.jpg by Muniu http://commons.wikimedia.org/wiki/File:Instant_miso_soup.jpg by Gleam http://www.flickr.com/photos/f-oxymoron/4203860207/sizes/l/in/photostream/ by f-oxymoron http://www.flickr.com/photos/jurvetson/1381322008/sizes/l/in/photostream/ by jurvetson http://www.flickr.com/photos/7332902@N05/3221210836/ by David O'Driscoll http://www.flickr.com/photos/edsweeney/4212380812/sizes/o/in/photostream/ by Ed Sweeney http://www.flickr.com/photos/jenny-pics/3230153121/sizes/l/in/photostream/ by jenny downing http://www.flickr.com/photos/oskay/265899766/ by Windell Oskay http://www.flickr.com/photos/alismith44/357361903/ by Ali West http://www.flickr.com/photos/cezaryborysiuk/3947857278/ by Cezary Borysiuk http://www.flickr.com/photos/wilhei/109403331/ by wilhei55 http://www.flickr.com/photos/antonymayfield/3221876089/ by antony_mayfield http://www.flickr.com/photos/ralphandjenny/4999895776/ by Ralph Daily