How do I correctly setup and teardown for my pytest class with tests

Question

I am using selenium for end to end testing and I can t get how to use setup class and teardown class methods  I need to set up browser in setup class method  then perform a bunch of tests defined as class methods and finally quit browser in teardown class method  But logically it seems like a bad solution  because in fact my tests will not work with class  but with object  I pass self param inside every test method  so I can access objects  vars  class TestClass         def setup class cls           pass              def test buttons self  data             self  attribute can be used  but not cls  attribute            pass              def test buttons2 self  data             self  attribute can be used  but not cls  attribute          pass              def teardown class cls           pass       And it even seems not to be correct to create browser instance for class   It should be created for every object separately  right  So  I need to use   init   and   del   methods instead of setup class and teardown class

User · Answer

Your code should work just as you expect it to if you add @classmethod decorators.

@classmethod 
def setup_class(cls):
    "Runs once per class"

@classmethod 
def teardown_class(cls):
    "Runs at end of class"

See http://pythontesting.net/framework/pytest/pytest-xunit-style-fixtures/

User · Answer

According to Fixture finalization   executing teardown code  the current best practice for setup and teardown is to use yield instead of return  import pytest   pytest fixture   def resource        print  quot setup quot       yield  quot resource quot      print  quot teardown quot    class TestResource      def test that depends on resource self  resource           print  quot testing    quot  format resource    Running it results in   py test --capture no pytest yield py     test session starts     platform darwin -- Python 2 7 10  pytest-3 0 2  py-1 4 31  pluggy-0 3 1 collected 1 items  pytest yield py setup testing resource  teardown       1 passed in 0 01 seconds      Another way to write teardown code is by accepting a request-context object into your fixture function and calling its request addfinalizer method with a function that performs the teardown one or multiple times  import pytest   pytest fixture   def resource request       print  quot setup quot        def teardown            print  quot teardown quot       request addfinalizer teardown           return  quot resource quot   class TestResource      def test that depends on resource self  resource           print  quot testing    quot  format resource

User · Answer

When you write  tests defined as class methods   do you really mean class methods  methods which receive its class as first parameter  or just regular methods  methods which receive an instance as first parameter     Since your example uses self for the test methods I m assuming the latter  so you just need to use setup method instead   class Test       def setup method self  test method             configure self attribute      def teardown method self  test method             tear down self attribute      def test buttons self             use self attribute for test   The test method instance is passed to setup method and teardown method  but can be ignored if your setup teardown code doesn t need to know the testing context  More information can be found here   I also recommend that you familiarize yourself with py test s fixtures  as they are a more powerful concept

User · Answer

As  Bruno suggested  using pytest fixtures is another solution that is accessible for both test classes or even just simple test functions  Here s an example testing python2 7 functions   import pytest   pytest fixture scope  function   def some resource request       stuff i setup     I setup        def some teardown            stuff i setup 0           but now I m torn down             print stuff i setup 0      request addfinalizer some teardown       return stuff i setup 0   def test 1 that needs resource some resource       print some resource        and now I m testing things       So  running test 1    produces   I setup    and now I m testing things    I setup     but now I m torn down      Notice that stuff i setup is referenced in the fixture  allowing that object to be setup and torn down for the test it s interacting with  You can imagine this could be useful for a persistent object  such as a hypothetical database or some connection  that must be cleared before each test runs to keep them isolated

User · Answer

import pytest class Test       pytest fixture       def setUp self           print  quot setup quot           yield  quot resource quot          print  quot teardown quot        def test that depends on resource self  setUp           print  quot testing    quot  format setUp    In order to run  pytest nam of the module py -v

User · Answer

This might help http   docs pytest org en latest xunit setup html  In my test suite  I group my test cases into classes  For the setup and teardown I need for all the test cases in that class  I use the setup class cls  and teardown class cls  classmethods   And for the setup and teardown I need for each of the test case  I use the setup method method  and teardown method methods   Example   lh    lt got log handler from logger module gt   class TestClass       classmethod     def setup class cls           lh info  starting class     execution  format cls   name           classmethod     def teardown class cls           lh info  starting class     execution  format cls   name          def setup method self  method           lh info  starting execution of tc      format method   name          def teardown method self  method           lh info  starting execution of tc      format method   name          def test tc1 self            lt tc content gt          assert       def test tc2 self            lt tc content gt          assert   Now when I run my tests  when the TestClass execution is starting  it logs the details for when it is beginning execution  when it is ending execution and same for the methods    You can add up other setup and teardown steps you might have in the respective locations   Hope it helps

[python] How do I correctly setup and teardown for my pytest class with tests?

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