Pytests and nosetests ran 0 tests

Python
#1

I actually got nosetests working before I reset my laptop. However, after resetting my laptop this afternoon, and after I reinstalled everything, I suddenly got ran 0 tests problem. So I decided to switch to pytest because I saw a lot of people recommended pytest in this forum. After installing pytest, I still got collected 0 items problem.
(I’m 100% sure syntax and folders are correct, they worked for nosetests before but not now.)

Below are my pytest code:

import pytest
from ex47.game import Room


def test_room():
    gold = Room("GoldRoom",
            """This room has gold in it you can grab. There's a
            door to the north.""")
    assert gold.name == "GoldRoom"
    assert gold.paths == {}


def test_room_paths():
    center = Room("Center", "Test room in the center.")
    north = Room("North", "Test room in the north.")
    south = Room("South", "Test room in the south.")

    center.add_paths({'north': north, 'south': south})
    assert center.go('north') == north
    assert center.go('south') == south


def test_map():
    start = Room("Start", "You can go west and down a hole.")
    west = Room("Trees", "There are trees here, you can go esat.")
    down = Room("Dungeon", "It's dark down here, you can go up.")

    start.add_paths({'west': west, 'down': down})
    west.add_paths({'east': start})
    down.add_paths({'up': start})

    assert start.go('west') == west
    assert start.go('west').go('east') == start
    assert start.go('down').go('up') == start

Below is the terminal output:

(lpthw) PS C:\Users\shane\lpthw\ex47\skeleton> pytest    
================================= test session starts ============================ 
platform win32 -- Python 3.8.3, pytest-5.4.3, py-1.8.1, pluggy-0.13.1
rootdir: C:\Users\shane\lpthw\ex47\skeleton
collected 0 items                                                                                                                                             

================================= no tests ran in 0.03s ==========================

PS: I’m working on Visual Studio Code and the interpreter path is set to the virtual environment (.venvs/lpthw/Scripts/python). I installed both nose and pytest in virtual environment so I have to start from here otherwise vscode throws “pylint unable to import blahblah” problem.

Not sure which part went wrong, need some help!
Thanks in advance!

#2

Hello @CodeX

Do you have an empty  __init__.py in your test folder? 
Perhaps you need one in the ex47 folder too.
#3

If it’s a clean install, have you install the project package:

pip install -e <path/url to where setup.py exists>

I overlooked this a few times when moving packages around in my machine. The -e is to endure it’s —editable

#4

Also make sure the names of your test files match pytests search rules, they’re slightly different from nose. (Pytest doesn’t accept files with tests in their name by default.)

#5

Yes I do. I have each for test and ex47 folder. They worked for nosetest before but not now.

#6

Wow, this is the exact problem.

“In those directories, search for test_*.py or *_test.py files, imported by their test package name.”

I named my test file with an s to the end so it collected nothing.
Thank you so much!

But I still don’t know why nosetest ran nothing. Do I have to work on that as well or leave it be?
I am not sure if I should focus on nosetest since so many people recommend pytest in this forum.

2 Likes
#7

Thank you so much! @florian solved my problem. But I’ll keep your advice in mind!

#8

My opinion? No need to waste time on it.

#9

I ran into the same problem. Deleting the s solved it for me. But now I ran into the problem of my system not recognising the assertequal function, because it was imported from nose I suppose.

import pytest
from project47.game import Room

def test_room():
    gold = Room("GoldRoom",
                """This room has gold in it you can grab.
                There's a door to the north.""")
    assert_equal(gold.name, "GoldRoom")
    assert_equal(gold.paths, {})

def test_room_paths():
    center = Room("Center", "Test room in the center.")
    north = Room("North", "Test room in the north.")
    south = Room("South", "Test room in the south.")

    center.add_paths({'north': north, 'south': south})
    assert_equal(center.go('north'), north)
    assert_equal(center.go('south'), south)


def test_map():
    start = Room("Start", "You can go west and down a hole")
    west = Room("Trees", "There are trees here, you can go east.")
    down = Room("Dungeon", "It's dark down here, you can go up.")

    start.add_paths({'west': west, 'down': down})
    west.add_paths({'east': start})
    down.add_paths({'up': start})

    assert_equal(start.go('west'), west)
    assert_equal(start.go('west').go('east'), start)
    assert_equal(start.go('down').go('up'). start)

I get this error:

Schermafbeelding 2021-03-13 132348
Schermafbeelding 2021-03-13 1323481905×736 22.4 KB

#10

Yes pytest uses only plain assertions.

assert a == b