Python- Assertion error when performing nosetests - python-2.7

Question

I am new to web.py . I was following ex52 LPTHW , and I had to perform nosetests on all the tests in tests folder. But I am getting 1 failed test due to assertion error. I tried reading different assertion errors and why they occur , but I cant figure out this one. I tried expanding the errors which the server could possibly show up like 500 Internal , 400 but its still failing the test. I have created the other code just like mentioned in the book: http://learnpythonthehardway.org/book/ex52.html
Here is my traceback:
C:\lpthw\gothonweb>cd tests
C:\lpthw\gothonweb\tests>nosetests
Traceback (most recent call last):
File "C:\Python27\lib\site-packages\web\application.py", line 239, in process
return self.handle()
File "C:\Python27\lib\site-packages\web\application.py", line 230, in handle
return self._delegate(fn, self.fvars, args)
File "C:\Python27\lib\site-packages\web\application.py", line 420, in _delegate
return handle_class(cls)
File "C:\Python27\lib\site-packages\web\application.py", line 396, in handle_class
return tocall(*args)
File "C:\lpthw\gothonweb\bin\app.py", line 29, in GET
return render.hello_form()
File "C:\Python27\lib\site-packages\web\template.py", line 1017, in __getattr__
t = self._template(name)
File "C:\Python27\lib\site-packages\web\template.py", line 1014, in _template
return self._load_template(name)
File "C:\Python27\lib\site-packages\web\template.py", line 1001, in _load_template
raise AttributeError, "No template named " + name
AttributeError: No template named hello_form
F...
======================================================================
FAIL: tests.app_tests.test_index
----------------------------------------------------------------------
Traceback (most recent call last):
File "C:\Python27\lib\site-packages\nose\case.py", line 197, in runTest
self.test(*self.arg)
File "C:\lpthw\gothonweb\tests\app_tests.py", line 12, in test_index
assert_response(resp)
File "C:\lpthw\gothonweb\tests\tools.py", line 5, in assert_response
assert status in resp.status, "Expected response %r not in %r" % (status , resp.status)
AssertionError: Expected response '200' not in '500 Internal Server Error'
----------------------------------------------------------------------
Ran 4 tests in 0.562s
FAILED (failures=1)
My tests code: app_tests.py
from nose.tools import *
from bin.app import app
from tests.tools import assert_response
def test_index():
#check that we get a 404 on the / URL
resp = app.request("/")
assert_response(resp, status= "404")
#test our first GET request to /hello
resp = app.request("/hello")
assert_response(resp)
#make sure default values work for the form
resp = app.request("/hello" , method="POST")
assert_response(resp , contains="Nobody")
#test that we get expected values
data = {'name':'Tejas','greet':'Ola!'}
resp = app.request("/hello " , method= "POST", data=data)
assert_response(resp , contains="Zed")
tools.py :
from nose.tools import *
import re
def assert_response(resp, contains=None, matches=None, headers=None, status= "200"):
assert status in resp.status, "Expected response %r not in %r" % (status , resp.status)
if status == "200":
assert resp.data , "Response data is empty."
if contains:
assert contains in resp.data, "Response does not contain %r" % contains
if matches:
reg = re.compile(matches)
assert reg.matches(resp.data), "Response does not match %r" % matches
if headers:
assert_equal(resp.headers , headers)
app.py code:
import web
from gothonweb import map
urls = (
'/game' , 'GameEngine' ,
'/' , 'Index',
)
app = web.application(urls, globals())
#little hack so that debug mode works with sessions
if web.config.get('_session') is None:
store= web.session.DiskStore('sessions')
session= web.session.Session(app, store, initializer={'room':None})
web.config._session = session
else:
session= web.config._session
render = web.template.render('templates/', base="layout")
class Index(object):
def GET(self):
#this is used to "setup" the session with starting values
session.room= map.START
web.seeother("/game")
class GameEngine(object):
def GET(self):
if session.room:
return render.show_room(room= session.room)
else:
#why is there here? do you need it?
return render.you_died()
def POST(self):
form= web.input(action=None)
if session.room and form.action:
session.room= session.room.go(form.action)
else:
session.room= None
if __name__ == "__main__" :
app.run()
After going ahead with the exercise now it gives me 2 import errors:
PS C:\lpthw\gothonweb\tests> nosetests
EE
======================================================================
ERROR: Failure: SyntaxError (invalid syntax (app.py, line 2))
----------------------------------------------------------------------
Traceback (most recent call last):
File "C:\Python27\lib\site-packages\nose\loader.py", line 418, in loadTestsFromName
addr.filename, addr.module)
File "C:\Python27\lib\site-packages\nose\importer.py", line 47, in importFromPath
return self.importFromDir(dir_path, fqname)
File "C:\Python27\lib\site-packages\nose\importer.py", line 94, in importFromDir
mod = load_module(part_fqname, fh, filename, desc)
File "C:\lpthw\gothonweb\tests\app_tests.py", line 2, in <module>
from bin.app import app
File "C:\lpthw\gothonweb\bin\app.py", line 2
from gothonweb import map.py
^
SyntaxError: invalid syntax
======================================================================
ERROR: Failure: ImportError (cannot import name map)
----------------------------------------------------------------------
Traceback (most recent call last):
File "C:\Python27\lib\site-packages\nose\loader.py", line 418, in loadTestsFromName
addr.filename, addr.module)
File "C:\Python27\lib\site-packages\nose\importer.py", line 47, in importFromPath
return self.importFromDir(dir_path, fqname)
File "C:\Python27\lib\site-packages\nose\importer.py", line 94, in importFromDir
mod = load_module(part_fqname, fh, filename, desc)
File "C:\lpthw\gothonweb\tests\map_tests.py", line 2, in <module>
from gothonweb import map
ImportError: cannot import name map
----------------------------------------------------------------------
Ran 2 tests in 0.002s
FAILED (errors=2)
directory structure:
C:/lpthw/
gothonweb/
bin build dist doc sessions Gothonweb templates tests map.py app.py
tests/
map_tests.py
app_tests.py
__init__.py
tools.py
What should I do to fix the error? Thanks for the suggestions.

Answer 1

For this error,
"AttributeError: No template named hello_form"
use an absolute path and see if that works, instead of
"render = web.template.render('templates/', base="layout")
try:
"render = web.template.render('C:/lpthw/gothonweb/bin/templates', base="layout")

Answer 2

Amazingly, your test has nothing to do with app.py.
from nose.tools import *
from bin.app import app
from tests.tools import assert_response
def test_index():
#check that we get a 404 on the / URL
resp = app.request("/")
assert_response(resp, status= "404")
#test our first GET request to /hello
resp = app.request("/hello")
assert_response(resp)
#make sure default values work for the form
resp = app.request("/hello" , method="POST")
assert_response(resp , contains="Nobody")
#test that we get expected values
data = {'name':'Tejas','greet':'Ola!'}
resp = app.request("/hello " , method= "POST", data=data)
assert_response(resp , contains="Zed")
App.py
import web
from gothonweb import map
urls = (
'/game' , 'GameEngine' ,
'/' , 'Index',
)
app = web.application(urls, globals())
#little hack so that debug mode works with sessions
if web.config.get('_session') is None:
store= web.session.DiskStore('sessions')
session= web.session.Session(app, store, initializer={'room':None})
web.config._session = session
else:
session= web.config._session
render = web.template.render('templates/', base="layout")
class Index(object):
def GET(self):
#this is used to "setup" the session with starting values
session.room= map.START
web.seeother("/game")
class GameEngine(object):
def GET(self):
if session.room:
return render.show_room(room= session.room)
else:
#why is there here? do you need it?
return render.you_died()
def POST(self):
form= web.input(action=None)
if session.room and form.action:
session.room= session.room.go(form.action)
else:
session.room= None
if __name__ == "__main__" :
app.run()
Can you see, how they are not related
Your first test says you should get a 404 on the '/' url but that would only happen if '/' didn't exist. Your app.py code clearly shows that '/' calls on GET in the Index class.
Second test, resp = app.request("/hello") now that would give you a 404 error because that url doesn't exist on app.py
The same goes for the third test as '/hello' doesn't exist in your tuple of urls in app.py
And the fifth test as well
Although your tests are invalid, the primary problem you have though is trying to perform the automated test from inside the tests directory; that's wrong.
C:\lpthw\gothonweb\tests> nosetests
This is not the right thing to do, you need to be a directory below for all your imports to work e.g In app_tests you are trying to import bin/app.py but that's not in the 'tests' directory
Do this instead
C:\lpthw\gothonweb> nosetests
This way all the files that you need would be imported
Back to app_tests.py. I'll write out a very simple test that's actually related to app.py
from bin.app import app
from test.tools import assert_response
def test_index():
#check that we get a 303 on the / url
#this is because web.seeother() will always send the browser this http code
resp = app.request("/")
assert_response(resp, status= "303")
def test_game():
#check that we get a 200 on /game
resp = app.request("/game")
assert_response(resp, status = '200')
#check that we have response data on a form sumbit
resp = app.request("/game", method = 'POST')
aseert_response(resp.data)

Answer 3

The assertion_error you getting because your ran nosetests in this directory
/gothroweb/test
you should run it in
/gothroweb
bin docs gothonweb templates tests
./bin:
app.py app.pyc __init__.py __init__.pyc
./docs:
./gothonweb:
__init__.py __init__.pyc
./templates:
hello_form.html index.html layout.html
./tests:
app_tests.py __init__.py test.html tools.pyc
app_tests.pyc __init__.pyc tools.py
cheers