pytest : All about pytest

pytest : All about pytest

https://drive.google.com/file/d/1-yL5U1ZQaH6NNv2XkCb2yXe_Nq0Piiw1/view?usp=sharing

Index :

1.  Installation x 2
2.  Project structure
3. Sample code
4. Important commands x 7
5. Run specific test case
6. Raise pytest exception (pytest.raises)
7. labels (pytest.mark.label_name ,pytest.mark.skip,pytest.mark.skip_if)
8. Parameterize (pytest.mark.parametrize('x,y,res',[(1,2,3),(0,3,3)]) )
9. Fixture (pytest.fixture(scope="module") )
10. conftest
11. pdb

Installation:
Using pip

pip3 install pytest

pip install selenium

Using requirements.txt : project>requirements.txt

selenium >= 3.0

pytest >= 3.10.1

pytest-html >= 1.20.0

pip install -r requirements.txt

or

pipenv install -r requirements.txt #Inside virtual env
Project structure

add file : - project>tests>test_filename.py

Sample Code

from selenium import webdriver

def test_1():

 driver=webdriver.Chrome("chromedriverpath")

 driver.get(url)

 objs=driver.find_elements_by_xpath("//button")

 for i in objs:

  i.click()

1. open terminal
2. cd to project
3. excute command "pytest"

Important commands:

1.    pytest --pdb #runs the debugger when an err is encountered

2.    pytest -s #to "print" result in console

3.    pytest -v #verbose 

4.    pytest --maxfail=2 # limit no of fails

5.    py.test --html=1.html

6.    pipenv run pytest

7.    pipenv run py.test --html=1.html

pytest -v -k "add or something" # runs only methods with add ,something

pytest -h # help

pytest -v -x #to stop after 1st fail

pytest -v -x --tb=no # do not display stack trace

pytest -q # quiet mode

pytest -rsx #report skipped tests 

pytest --lf #runs only tests that failed on last attempt

# in eclipse Window > Preferences > Pydev> PyUnit = Py.testRunner and add above Parameters 

Execute specific method of class

pytest test_filename.py::test_method

Exception
def test_mytest():

with pytest.raises(ZeroDivisionError):
  1/0

  

Markers(labels)

@pytest.mark.label_name" .To run "pytest -v -m label_name"

@pytest.mark.skip(reason="any reason") #skip methods

@pytest.mark.skip_if(sys.version_info < (3,3),reason="some reason")

Parametrize

import pytest

@pytest.mark.parametrize('x,y,res',[(1,2,3),(0,3,3)])

def test_add(x,y,res):

    assert classname.add(x,y,res)

Fixtures(similar to @Before annotations in Junit test used for - db connection , etc.,)
@pytest.fixture(scope="module") #scope =module/session/function def fix():
    pass    #setup code
    yield   #run till here
    print("done") # tear down code

def fn(fix):
    #fix runs 1st

example:
from selenium import webdriver
@pytest.fixture()
def test_setup():
    global driver
    driver =webdriver.Chrome(executable_path="C:/Users/driver.exe")# Windows
    driver.implicitly.wait(5)
    driver.maximise()
    yield()
    driver.close()
    driver.quit()

conftest.py
You can put all fixtures inside this file and this file will execute before test starts

Debugger :

import pdb;

pdb.set_trace() # to break

Others 

Eclipse Setup :

 (if u are using eclipse : Window->Preferences --> pydev --> PyUnit --> Change the Test runner to "Py.test runner".)

Right Click over the file. Run As --> Python Unit-Test

Or press Ctrl+F9:-

It will prompt you to select the test

User can use fixture or setup-teardown
setup
import pytest
def setup_module(module):

tiredown 
import pytest
def teardown_module(module):

Allure report
pip install allure-pytest
pip list | grep -i allure

pytest --alluredir=/Users/Documents/reports
allure generate /Users/Documents/reports

setup.py
#Add this to setup.py file:
from setuptools import setup
setup(
    # ...,
    setup_requires=["pytest-runner", ...],
    tests_require=["pytest", ...],
    # ...,
)

#And create an alias into setup.cfg file:
[aliases]
test=pytest
[tool:pytest]
addopts = --verbose
python_files = testing/*/*.py

#If you now type:
python setup.py test


Links 

#https://docs.pytest.org/en/latest/goodpractices.html#goodpractices

https://docs.pytest.org/en/latest/parametrize.html
https://docs.pytest.org/en/latest/example/parametrize.html#paramexamples
https://pypi.org/project/pytest-html/
https://pypi.org/project/pytest-csv/

 important read
 https://bytes.yingw787.com/posts/2018/12/10/data_driven_testing_three/
 https://gitlab.com/qalabs/blog/pytest-parametrize-example

important watch **
https://www.youtube.com/watch?v=o9pEzgHorH0
https://www.youtube.com/watch?v=RdE-d_EhzmA

hooks
https://stackoverflow.com/questions/21930858/pytest-parameterize-row-from-csv-as-a-testcase?rq=1 

Running pytest inside eclipse ide
Ref :https://stackoverflow.com/questions/37985589/how-to-debug-or-run-pytest-scripts-using-eclipse