Module pedantic.tests.test_in_subprocess

Classes

class TestInSubprocess (methodName='runTest')

A class whose instances are single test cases.

By default, the test code itself should be placed in a method named 'runTest'.

If the fixture may be used for many test cases, create as many test methods as are needed. When instantiating such a TestCase subclass, specify in the constructor arguments the name of the test method that the instance is to execute.

Test authors should subclass TestCase for their own tests. Construction and deconstruction of the test's environment ('fixture') can be implemented by overriding the 'setUp' and 'tearDown' methods respectively.

If it is necessary to override the init method, the base class init method must always be called. It is important that subclasses should not change the signature of their init method, since instances of the classes are instantiated automatically by parts of the framework in order to be run.

When subclassing TestCase, you can set these attributes: * failureException: determines which exception will be raised when the instance's assertion methods fail; test methods raising this exception will be deemed to have 'failed' rather than 'errored'. * longMessage: determines whether long messages (including repr of objects used in assert methods) will be printed on failure in addition to any explicit message passed. * maxDiff: sets the maximum length of a diff in failure messages by assert methods using difflib. It is looked up as an instance attribute so can be configured by individual tests if required.

Create an instance of the class that will use the named test method when executed. Raises a ValueError if the instance does not have a method with the specified name.

Expand source code

class TestInSubprocess(unittest.IsolatedAsyncioTestCase):
    async def test_in_subprocess_simple(self):
        @in_subprocess
        def f() -> int:
            return 42

        assert await f() == 42

    async def test_in_subprocess_custom_object(self):
        class Foo:
            def __init__(self, v) -> None:
                self._value = v

        @in_subprocess
        def f() -> Foo:
            return Foo(v=42)

        assert (await f())._value == 42

    async def test_in_subprocess_simple_async(self):
        @in_subprocess
        async def f() -> int:
            return 42

        assert await f() == 42

    async def test_in_subprocess_no_args(self):
        @in_subprocess
        def f() -> int:
            time.sleep(0.1)
            return 42

        async def t() -> None:
            for _ in range(6):
                await asyncio.sleep(0.01)
                nonlocal counter
                counter += 1

        counter = 0
        task = asyncio.create_task(t())
        assert await f() == 42
        assert counter >= 5
        await task

    async def test_in_subprocess_no_args_no_return(self):
        @in_subprocess
        def f() -> None:
            time.sleep(0.1)

        assert await f() is None

    async def test_in_subprocess_exception(self):
        @in_subprocess
        def f() -> NoReturn:
            raise RuntimeError('foo')

        with self.assertRaises(expected_exception=RuntimeError):
            await f()

    async def test_not_in_subprocess_blocks(self):
        async def f() -> int:
            time.sleep(0.1)
            return 42

        async def t() -> None:
            for _ in range(6):
                await asyncio.sleep(0.05)
                nonlocal counter
                counter += 1

        counter = 0
        task = asyncio.create_task(t())
        assert await f() == 42
        assert counter == 0
        await task

    async def test_in_subprocess_with_arguments(self):
        @in_subprocess
        def f(a: int, b: int) -> int:
            return a + b

        assert await f(4, 5) == 9
        assert await f(a=4, b=5) == 9

    def test_inner_function_sync(self):
        """ Needed for line coverage"""

        rx, tx = Pipe(duplex=False)
        _inner(tx, lambda x: 1 / x, x=42)
        assert rx.recv() == 1 / 42

        _inner(tx, lambda x: 1 / x, x=0)
        ex = rx.recv()
        assert isinstance(ex, SubprocessError)

    def test_inner_function_async(self):
        """ Needed for line coverage"""

        async def foo(x):
            return 1/x

        rx, tx = Pipe(duplex=False)
        _inner(tx, foo, x=42)
        assert rx.recv() == 1 / 42

        _inner(tx, foo, x=0)
        ex = rx.recv()
        assert isinstance(ex, SubprocessError)

    async def test_in_subprocess_instance_method(self):
        class Foo:
            async def pos_args(self) -> int:
                return await self.f(4, 5)

            async def kw_args(self) -> int:
                return await self.f(a=4, b=5)

            @in_subprocess
            def f(self, a: int, b: int) -> int:
                return a + b

        foo = Foo()
        assert await foo.pos_args() == 9
        assert await foo.kw_args() == 9

    async def test_in_subprocess_static_method(self):
        class Foo:
            async def pos_args(self) -> int:
                return await self.f(4, 5)

            async def kw_args(self) -> int:
                return await self.f(a=4, b=5)

            @staticmethod
            @in_subprocess
            def f(a: int, b: int) -> int:
                return a + b

        foo = Foo()
        assert await foo.pos_args() == 9
        assert await foo.kw_args() == 9

Ancestors

• unittest.async_case.IsolatedAsyncioTestCase
• unittest.case.TestCase

Methods

async def test_in_subprocess_custom_object(self)

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async def test_in_subprocess_custom_object(self):
    class Foo:
        def __init__(self, v) -> None:
            self._value = v

    @in_subprocess
    def f() -> Foo:
        return Foo(v=42)

    assert (await f())._value == 42

async def test_in_subprocess_exception(self)

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async def test_in_subprocess_exception(self):
    @in_subprocess
    def f() -> NoReturn:
        raise RuntimeError('foo')

    with self.assertRaises(expected_exception=RuntimeError):
        await f()

async def test_in_subprocess_instance_method(self)

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async def test_in_subprocess_instance_method(self):
    class Foo:
        async def pos_args(self) -> int:
            return await self.f(4, 5)

        async def kw_args(self) -> int:
            return await self.f(a=4, b=5)

        @in_subprocess
        def f(self, a: int, b: int) -> int:
            return a + b

    foo = Foo()
    assert await foo.pos_args() == 9
    assert await foo.kw_args() == 9

async def test_in_subprocess_no_args(self)

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async def test_in_subprocess_no_args(self):
    @in_subprocess
    def f() -> int:
        time.sleep(0.1)
        return 42

    async def t() -> None:
        for _ in range(6):
            await asyncio.sleep(0.01)
            nonlocal counter
            counter += 1

    counter = 0
    task = asyncio.create_task(t())
    assert await f() == 42
    assert counter >= 5
    await task

async def test_in_subprocess_no_args_no_return(self)

Expand source code

async def test_in_subprocess_no_args_no_return(self):
    @in_subprocess
    def f() -> None:
        time.sleep(0.1)

    assert await f() is None

async def test_in_subprocess_simple(self)

Expand source code

async def test_in_subprocess_simple(self):
    @in_subprocess
    def f() -> int:
        return 42

    assert await f() == 42

async def test_in_subprocess_simple_async(self)

Expand source code

async def test_in_subprocess_simple_async(self):
    @in_subprocess
    async def f() -> int:
        return 42

    assert await f() == 42

async def test_in_subprocess_static_method(self)

Expand source code

async def test_in_subprocess_static_method(self):
    class Foo:
        async def pos_args(self) -> int:
            return await self.f(4, 5)

        async def kw_args(self) -> int:
            return await self.f(a=4, b=5)

        @staticmethod
        @in_subprocess
        def f(a: int, b: int) -> int:
            return a + b

    foo = Foo()
    assert await foo.pos_args() == 9
    assert await foo.kw_args() == 9

async def test_in_subprocess_with_arguments(self)

Expand source code

async def test_in_subprocess_with_arguments(self):
    @in_subprocess
    def f(a: int, b: int) -> int:
        return a + b

    assert await f(4, 5) == 9
    assert await f(a=4, b=5) == 9

def test_inner_function_async(self)

Needed for line coverage

Expand source code

def test_inner_function_async(self):
    """ Needed for line coverage"""

    async def foo(x):
        return 1/x

    rx, tx = Pipe(duplex=False)
    _inner(tx, foo, x=42)
    assert rx.recv() == 1 / 42

    _inner(tx, foo, x=0)
    ex = rx.recv()
    assert isinstance(ex, SubprocessError)

def test_inner_function_sync(self)

Needed for line coverage

Expand source code

def test_inner_function_sync(self):
    """ Needed for line coverage"""

    rx, tx = Pipe(duplex=False)
    _inner(tx, lambda x: 1 / x, x=42)
    assert rx.recv() == 1 / 42

    _inner(tx, lambda x: 1 / x, x=0)
    ex = rx.recv()
    assert isinstance(ex, SubprocessError)

async def test_not_in_subprocess_blocks(self)

Expand source code

async def test_not_in_subprocess_blocks(self):
    async def f() -> int:
        time.sleep(0.1)
        return 42

    async def t() -> None:
        for _ in range(6):
            await asyncio.sleep(0.05)
            nonlocal counter
            counter += 1

    counter = 0
    task = asyncio.create_task(t())
    assert await f() == 42
    assert counter == 0
    await task