How to share a variable across modules for all tests in py.test

How to share a variable across modules for all tests in py.test

In pytest, you can share a variable across multiple test modules using fixtures and conftest.py files. A fixture is a way to provide data, resources, or setup/teardown functionality to your tests. A conftest.py file is a special file that pytest looks for in your test directory and automatically loads. You can define fixtures in the conftest.py file and then use them in your test modules.

Here's an example of how you can share a variable across test modules using fixtures and conftest.py:

  • Create a conftest.py file in your test directory:
# conftest.py

import pytest

@pytest.fixture(scope='session')
def shared_variable():
    return {'value': 42}
  • In your test modules, you can use the shared_variable fixture by including it as an argument in your test functions:
# test_module1.py

def test_module1(shared_variable):
    assert shared_variable['value'] == 42

# test_module2.py

def test_module2(shared_variable):
    assert shared_variable['value'] == 42

In this example, the shared_variable fixture is defined in the conftest.py file. It's set to have a session scope, which means it will be created once and shared across all test modules for the entire test session.

You can use the fixture by including its name as an argument in your test functions. The fixture provides the data you defined in conftest.py.

By using fixtures and conftest.py, you can share variables, setup, and teardown functions, and other resources across multiple test modules while keeping your test code organized and maintainable.

Examples

  1. "Python pytest share variable across modules"

    • Description: This query seeks information on sharing variables across multiple modules in pytest.
    • Code:
      # conftest.py
import pytest

@pytest.fixture(scope="session")
def shared_variable():
    return "This is a shared variable"

# test_module.py
def test_shared_variable(shared_variable):
    assert shared_variable == "This is a shared variable"

  2. "pytest global variable between modules"

    • Description: Users often search for ways to maintain global variables across pytest modules.
    • Code:
      # conftest.py
import pytest

@pytest.fixture(scope="session")
def global_variable():
    return {"value": None}

# test_module.py
def test_global_variable(global_variable):
    global_variable["value"] = 42
    assert global_variable["value"] == 42

  3. "pytest share state between modules"

    • Description: This query targets sharing states between pytest modules.
    • Code:
      # conftest.py
import pytest

@pytest.fixture(scope="session")
def shared_state():
    state = {"value": None}
    yield state
    # Any teardown code can be added here

# test_module.py
def test_shared_state(shared_state):
    shared_state["value"] = "Hello"
    assert shared_state["value"] == "Hello"

  4. "pytest share data between tests"

    • Description: Users seek methods to share data between tests in pytest.
    • Code:
      # conftest.py
import pytest

@pytest.fixture(scope="module")
def shared_data():
    return []

# test_module.py
def test_share_data(shared_data):
    shared_data.append(42)
    assert shared_data == [42]

  5. "pytest pass variables between modules"

    • Description: This query looks for ways to pass variables between different pytest modules.
    • Code:
      # conftest.py
import pytest

@pytest.fixture(scope="module")
def passed_variable():
    return "Passed variable"

# test_module.py
def test_passed_variable(passed_variable):
    assert passed_variable == "Passed variable"

  6. "pytest fixture across modules"

    • Description: Users explore fixtures across multiple pytest modules.
    • Code:
      # conftest.py
import pytest

@pytest.fixture(scope="session")
def shared_fixture():
    return "Shared fixture"

# test_module.py
def test_shared_fixture(shared_fixture):
    assert shared_fixture == "Shared fixture"

  7. "pytest global variable between tests"

    • Description: This query is about maintaining global variables across pytest tests.
    • Code:
      # conftest.py
import pytest

@pytest.fixture(scope="session")
def global_var():
    global _global_var
    _global_var = 42
    yield _global_var
    del _global_var

# test_module.py
def test_global_var(global_var):
    assert global_var == 42

  8. "pytest share state between tests"

    • Description: Users seek methods to share states between different pytest tests.
    • Code:
      # conftest.py
import pytest

@pytest.fixture(scope="session")
def shared_state():
    state = {}
    yield state
    # Any teardown code can be added here

# test_module.py
def test_shared_state(shared_state):
    shared_state["value"] = "Test"
    assert shared_state["value"] == "Test"

  9. "pytest pass variable between test functions"

    • Description: This query is about passing variables between different test functions within pytest.
    • Code:
      # conftest.py
import pytest

@pytest.fixture(scope="module")
def passed_variable():
    return "Passed variable"

# test_module.py
def test_passed_variable(passed_variable):
    assert passed_variable == "Passed variable"

  10. "pytest shared context between tests"

    • Description: Users want to understand how to maintain a shared context between pytest tests.
    • Code:
      # conftest.py
import pytest

@pytest.fixture(scope="session")
def shared_context():
    context = {"value": None}
    yield context
    # Any teardown code can be added here

# test_module.py
def test_shared_context(shared_context):
    shared_context["value"] = "Hello"
    assert shared_context["value"] == "Hello"

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