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Introduction to pytest
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Andreas Pelme
July 23, 2014
Programming
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970
Introduction to pytest
Slides for my EuroPython 2014 talk on pytest
Andreas Pelme
July 23, 2014
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Transcript
*OUSPEVDUJPOUPQZUFTU "OESFBT1FMNF &VSP1ZUIPO 4MJEFTIUUQTQFBLFSEFDLDPNQFMNF personalkollen
5PQJDT w*OUSPEVDUJPO w5FTUJOHXJUIMFTTCPJMFSQMBUF w1MVHJOT w5FTUEJTDPWFSZ w1ZUFTUpYUVSFT w1PSUJOHFYJTUJOHQSPKFDUT
5FTUJOH
BGVMMGFBUVSFE1ZUIPOUFTUJOHUPPM QZUFTU
None
5FTUTXJUIMFTTCPJMFSQMBUF
%FNPUJNF
%FNP#FGPSF import unittest ! ! def upper_reverse(text):
return ''.join(reversed(text.upper())) ! ! class TestUpperReverse(unittest.TestCase): def test_upper_reverse(self): self.assertEqual(upper_reverse('hello'), 'OLLEH')
%FNP"GUFS def upper_reverse(text): return ''.join(reversed(text.upper()))
! ! def test_upper_reverse(): assert upper_reverse('hello') == 'OLLEH'
%FNPUJNF w"TTFSUJPOTXJUIQMBJOBTTFSUTUBUFNFOU w4VCDMBTTJOH5FTU$BTFJTOPUSFRVJSFE w5FTUTBSFGPVOEBOEDPMMFDUFEXJUIUIF QZUFTUDPNNBOE
1MVHJOT w%JTUSJCVUFEQBSBMMFMJ[FEQZUFTUYEJTU w%KBOHPQZUFTUEKBOHP w5XJTUFEQZUFTUUXJTUFE w-PHDBQUVSFQZUFTUDBQUVSFMPH w$PWFSBHFSFQPSUJOHQZUFTUDPW wBOENBOZNPSF wIUUQQZUFTUPSHMBUFTUQMVHJOTIUNMFYUFSOBMQMVHJOT
3VOOJOHUIFUFTUT
3VOUIFFOUJSFUFTUTVJUF $ py.test
3VOBMMUFTUTJOBTQFDJpDpMF $ py.test test_bar.py
3VOBMMUFTUDBTFTUIBUBSFOBNFE UFTU@GPP $ py.test -‐k test_foo
#ZEFGBVMU QZUFTUEJTDPWFSTUFTUTJO test_*.py *_test.py
.BSLJOHUFTUT ZPVDBONBLFVQZPVSPXONBSLFST import pytest ! ! @pytest.mark.slow def
test_very_long_running_test(): pass
3VOBMMUFTUTXJUIBTQFDJpDNBSLFS $ py.test -‐m slow
PSXJUIPVUBTQFDJpDNBSLFS $ py.test -‐m "not slow"
4LJQQJOHUFTUT import pytest import sys ! ! @pytest.mark.skipif(sys.platform
== 'darwin', reason='Feature Y not supported on OS X') def test_non_osx(): pass
%FQFOEFODZJOKFDUJPOPGUFTUpYUVSFT QZUFTUpYUVSFT
%FNPUJNF
%FQFOEFODZJOKFDUJPOPGUFTUIFMQFS import pytest from selenium.webdriver import Firefox !
@pytest.fixture def webdriver(request): driver = Firefox() request.addfinalizer(driver.quit) return driver ! def test_nix_website_title(webdriver): webdriver.get('https://nixos.org/nix/') assert 'Nix' in webdriver.title ! def test_pytest_website_title(webdriver): webdriver.get('http://pytest.org/latest/')
3VOUFTUTJOGPVSQSPDFTTFT $ pip install pytest-‐xdist $ py.test -‐n 4
VOJUUFTU /PTFTUZMFBOE%KBOHPUFTUTBSFTVQQPSUFE 1PSUJOHBOFYJTUJOHQSPKFDU
"EWBODFE6TFTPGQZUFTU'JYUVSFT 'MPSJT#SVZOPPHIF "! UPEBZ ! *NQSPWJOHZPVSBVUPNBUFEUFTUJOHXJUIQZUFTU )PMHFS,SFLFM ""!'SJEBZ %PO`UNJTT
&NBJMBOESFBT!QFMNFTF 5XJUUFS!BOESFBTQFMNF *3$QFMNF!QZMJCPO'SFFOPEF 4MJEFTIUUQTQFBLFSEFDLDPNQFMNF 2VFTUJPOT