How to run a pytest-bdd test? - pytest

Question

I am not understanding how to properly run a simple test(feature file and python file)
with the library pytest-bdd.
From the official documentation, I can't understand what command to issue to run a test.
I tried using pytest command, but I saw the NO test ran.
Do I need to use another library behave to run a feature file?

Answer 1

I figured out trying for 2 days,that ,
for running a pytest-bdd test, there are certain requirements, at least in my view.
put both the feature file and python file in the same directory (maybe this can be changed with configuration files)
the python file name needs to start with test_
the python file needs to contain a method of which name will start with test_
the method starting with test_ , need to be assigned to the #scenario sentence
to run the test, issue pytest command in the same directory(maybe it is also configurable)
After issuing you will only see the method with the name starting with test_ has passed, but all the tests actually ran. To test, you can assert False in any #when or #then annotated method, it will throw errors.
The system contained : pytest-bdd==3.0.2 (copied from pip freeze output)

Answer 2

Features files and python files can be placed in different folders using the bdd_features_base_dir hook provided by pytest-bdd; I think it is better having features files in different folders too.
Here you can see a working example (a simple hello world BDD test):
https://github.com/davidemoro/pytest-play-docker/tree/master/tests
https://github.com/davidemoro/pytest-play-docker/blob/master/tests/pytest.ini (see bdd_features_base_dir in [pytest] section)
https://github.com/davidemoro/pytest-play-docker/tree/master/tests/bdd
If you want to try out pytest-bdd without installation you can use Docker. Create a folder with inside your pytest BDD files and if you want a separate features folder targeted in bdd_features_base_dir and run:
docker run --rm -it -v $(pwd):/src davidemoro/pytest-play:latest

Answer 3

I've found out, that in the python file you don't have to put:
the method starting with test_ , need to be assigned to the #scenario sentence
You can just add: scenarios("") - to allow the tests to be started, which are using steps defined in this specific python file.
Remember to import scenarios!: from pytest_bdd import scenarios
Example:
Code example

Answer 4

Command..
pytest -v path_to_test_file.py
Things to note here..
Check format of feature file as filename.feature
Always __init__ modules, otherwise test-runner will not find test files
Glue right step definitions to test function
Add feature in features module
If you are using python3 execute test with python3
So,
python3 -m pytest -v path_to_test_file.py
Documentation
https://pytest-bdd.readthedocs.io/en/stable/#