pytest-curio: pytest support for curio

curio code is written in the form of async/await, which makes it slightly more difficult to test using normal testing tools. pytest-curio provides useful fixtures and markers to make testing easier.

@pytest.mark.curio
async def test_some_curio_code():
    res = await library.do_something()
    assert b'expected result' == res

pytest-curio has been strongly influenced by pytest-asyncio.

Features

• fixtures for injecting curio kernel
• pytest markers for treating tests as curio coroutines

Installation

To install pytest-curio, simply:

$ pip install pytest-curio

This is enough for pytest to pick up pytest-curio.

Fixtures

kernel

Creates and injects a new instance of the default curio kernel. The kernel will be stoped at the end of the test.

Note that just using the kernel fixture won't make your test function a coroutine. You'll need to interact with the kernel directly, using methods like kernel.run. See the pytest.mark.curio marker for treating test functions like coroutines.

def test_http_client(kernel):
    result = []
    async def my_coroutine(obj):
        result.append(obj)
    url = 'http://httpbin.org/get'
    task = kernel.run(my_coroutine(url))
    assert url in result

Markers

pytest.mark.curio

Mark your test coroutine with this marker and pytest will execute it as an curio task using the kernel provided by the kernel fixture. See the introductory section for an example.