How to Add Command Line Parameter to Pytest Command?

To add command line parameters to a pytest command, you can simply include them when running the pytest command in the terminal. For example, you can add parameters such as the test file or directory to run, markers to select specific tests, verbosity level, and more. These parameters can help customize how pytest runs and what tests are included in the test execution. By including command line parameters, you can easily modify the behavior of pytest according to your specific testing needs.

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What is the command line option for specifying a custom marker in pytest tests?

The command line option for specifying a custom marker in pytest tests is --markers. You can use this option to define custom markers in your test files and then use them to selectively run specific tests based on the marker.

For example, if you have a custom marker named smoke, you can run tests marked with this marker by executing the following command:

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pytest -m smoke

You can also combine multiple markers to run tests that have any of the specified markers:

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pytest -m "smoke or regression"

You can define custom markers in your test files using the @pytest.mark decorator. For example:

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import pytest

@pytest.mark.smoke
def test_example():
    assert True

This test would be marked with the smoke marker, and you can then use the pytest -m smoke command to run this test specifically.

How to accept and handle command line arguments in pytest fixtures?

To accept and handle command line arguments in pytest fixtures, you can use the pytest_addoption hook to define custom command line options and then pass them to your fixture.

Here is an example:

1. Define custom command line options using the pytest_addoption hook in your conftest.py file:

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def pytest_addoption(parser):
    parser.addoption("--myoption", action="store", help="My custom command line option")

1. Create a fixture in your conftest.py file that accepts the command line options as arguments:

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import pytest

@pytest.fixture
def my_fixture(request):
    my_option = request.config.getoption("--myoption")
    # Handle the command line option as needed
    return my_option

1. Use the fixture in your test functions by passing it as an argument:

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def test_my_test(my_fixture):
    # Use the fixture in your test
    assert my_fixture == "value"  # Example assertion

1. Run your tests with the custom command line option:

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pytest --myoption=value

This way, you can accept and handle command line arguments in pytest fixtures.

What is the format for passing command line parameters to pytest test cases?

To pass command line parameters to pytest test cases, you can use the following format:

pytest filename.py::test_name --parameter_name=value

For example, if you have a test case named "test_example" in a file named "test_file.py" and you want to pass a parameter named "param" with a value of "123", you can run the test case as follows:

pytest test_file.py::test_example --param=123

How to define command line option handling in pytest?

In pytest, command line option handling can be defined by using the pytest_addoption hook function provided by the pytest framework. This allows you to specify custom command line options that users can pass when running your tests.

Here's an example of how you can define command line option handling in pytest:

1. Import the pytest module in your test script:

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import pytest

1. Define the pytest_addoption hook function in your test script. This function is called by pytest when it collects command line options:

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def pytest_addoption(parser):
    parser.addoption("--my_option", action="store", help="Specify a custom option")

In this example, we are defining a custom command line option called --my_option that users can pass when running your tests.

1. Access the value of the custom option in your test functions or fixtures by using the request fixture provided by pytest:

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def test_custom_option(request):
    custom_option_value = request.config.getoption("--my_option")
    # Use the custom option value in your test logic

When running your tests, users can specify the custom command line option like this:

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pytest --my_option=custom_value

This allows you to customize the behavior of your tests based on the command line options passed by users.