pytest-bdd demo

Sure! Here's a simple example of how you can use pytest-bdd for behavior-driven development (BDD) testing in Python.

First, make sure you have pytest-bdd installed. You can do this by running `pip install pytest-bdd`.

Next, create a new Python file called `test_demo.py` and add the following code:

import pytest
from pytest_bdd import scenario, given, when, then


@scenario('demo.feature', 'Add two numbers')
def test_add_numbers():
    pass


@given("I have two numbers <a> and <b>")
def numbers(a, b):
    return int(a), int(b)


@when("I add the numbers")
def add_numbers(numbers):
    return sum(numbers)


@then("I expect the result <result>")
def expect_result(add_numbers, result):
    assert add_numbers == int(result)

Next, create a new file called `demo.feature` and add the following code:

Feature: Addition

    Scenario: Add two numbers
        Given I have two numbers <a> and <b>
        When I add the numbers
        Then I expect the result <result>

        Examples:
        | a | b | result |
        | 2 | 3 | 5      |
        | 5 | 7 | 12     |

Now, you can run the tests by executing `pytest` in your terminal. pytest-bdd will automatically discover and execute your BDD scenarios.

This is just a basic example to get you started with pytest-bdd. You can define more complex scenarios and steps as per your testing needs. Happy testing!