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Fake objects designed with OOP in mind.

Home Page: https://proofit404.github.io/primitives/

License: BSD 2-Clause "Simplified" License

JavaScript 3.02% TypeScript 18.62% Shell 13.68% Python 64.67%

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Generator return value.

from primitives import Generator, Argument, Return, Callable

gen = Callable(Generator(1, 2, 3, Return(4)), a=Argument('a'), b=Argument('b'))

it = gen(a='a', b='b')

next(it)  # 1

next(it)  # 2

next(it)  # 3

next(it)  # StopIteration: 4

Awaitable throw arguments.

from primitives import Awaitable, Callable, Throw, Argument

coro = Callable(Awaitable(1, Throw(ValueError, Argument(TypeError))))

it = coro()

await it  # 1

it.throw(TypeError())  # ValueError()

AsyncContext exit method return value.

from primitives import AsyncContext, Exit

resource = AsyncContext(1, Exit(True))

async with resource as r:
    r  # 1
    raise ValueError()
# Execution continues here without exception

Awaitable send arguments.

from primitives import Awaitable, Send, Argument

a = Awaitable(1, Send(3, Argument(2)))

it = gen()

await it  # 1

it.send(2)  # 3

AsyncContext return value.

from primitives import AsyncContext

resource = AsyncContext(1)

async with resource as r:
    r  # 1

Awaitable object representation.

Empty Instance object.

from primitives import Callable, Instance

user = Instance(greet=Callable('Hello, John'))

user.greet()  # Hello, John

Add comparison with mock library to the index page. Writing mock for use case below would be a nightmare:

def greet_many(repo):
    for user in repo.users():
        print(user.greet('Hello'))

You could try to check that third user received congratulations in French. Mock version would a homework to exercise.

Fake objects within scopes should be used.

All fake objects instantiated within particular scope should be used before scope will be finalized.

from primitives import Scope

with Scope() as scope:

    func1 = scope.Callable(1, a=scope.Argument('x'))

    func2 = scope.Callable(2, a=scope.Argument('y'))

    func1(a='x') # 1

# Error (func2 was never called)

Initialize repository.

AsyncContext object representation.

Inherited Instance object.

from primitives import Callable, Instance

user = Instance(User, greet=Callable())

isinstance(user, User)  # True

Callable return value.

from primitives import Callable

func = Callable('Hello, John')

func()  # 'Hello, John'

Empty Callable object.

from primitives import Callable

func = Callable()

func()  # None

Callable object should be able to ignore arguments.

from primitives import Callable, Argument, Ignore

func = Callable('Hello, John', Argument(Ignore()))

func('John')  # Hello, John

func('Kate')  # Hello, John

Context return value.

from primitives import Context

resource = Context(1)

with resource as r:
    r  # 1

Class object produces Instance objects.

from primitives import Class, Instance, Callable

FkUser = Class(Instance(greet=Callable('Hello, John')))

user = FkUser()

user.greet()  # Hello, John

from primitives import Class, Instance, Callable

FkUser = Class(User, Instance(greet=Callable('Hello, John')))

user = FkUser()

user.greet()  # Hello, John

Never object attribute error.

from primitives import Never

never = Never()

never() # Exception

never.foo # Exception

Instance object representation.

Empty AsyncContext object.

from primitives import AsyncContext

resource = AsyncContext()

async with resource as r:
     r  # None

Empty Context object.

from primitives import Context

resource = Context()

with resource as r:
     r  # None

AsyncContext exit method arguments.

from primitives import AsyncContext, Exit, Argument

resource = AsyncContext(1, Exit(Argument(ValueError)))

async with resource as r:
    r  # 1
    raise ValueError()  # Ok

async with resource as r:
    r  # 1
    raise TypeError()  # Error

Context exit method return value.

from primitives import Context, Exit

resource = Context(1, Exit(True))

with resource as r:
    r  # 1
    raise ValueError()
# Execution continues here without exception

Correct README description paragraph.

Context object representation.

Inherited Instance object can't break Liskov substitution principle.

from primitives import Callable, Instance, Argument

user = Instance(User, greet=Callable(foo=Argument('bar')))
#                                    ---
# `User.greet` does not have `foo` argument.

Inherited Class object.

from primitives import Class

FkUser = Class(User)

inspect.isclass(FkUser)  # True

issubclass(FkUser, User)  # True

fk_user = FkUser()

isinstance(fk_user, User)  # True

Happy new year!

Class object representation.

Callable object should be able to throw exceptions.

from primitives import Callable, Throw

func = Callable(Throw(Exception()))

func()  # Exception

Callable keyword arguments.

from primitives import Callable, Argument

func = Callable(1, a=Argument('x'), b=Argument('y'))

func('x', 'y')  # 1

func(b='y', a='x')  # 1

from primitives import Callable, Argument

func = Callable(a=Argument('x'), b=Argument('y'))

func('x', 'y')  # None

func(b='y', a='x')  # None

Generator object representation.

Empty Generator object.

from primitives import Generator

gen = Generator()

it = gen()

next(it)  # StopIteration

Callable object representation.

Callable positional arguments.

from primitives import Argument, Callable

func = Callable('Hello, John', Argument('John'))

func('John')  # Hello, John

func('Kate')  # Exception

from primitives import Argument, Callable

func = Callable(Argument('John'))

func('John')  # None

func('Kate')  # Exception

from primitives import Argument, Callable

func = Callable(Argument('John'))

func(a='John')  # Exception

Generator throw arguments.

from primitives import Generator, Callable, Throw, Argument

gen = Callable(Generator(1, Throw(ValueError, Argument(TypeError))))

it = gen()

next(it)  # 1

it.throw(TypeError())  # ValueError()

Instance object attributes.

from primitives import Attribute, Instance

user = Instance(name=Attribute('John'))

user.name  # 'John'

from primitives import Attribute, Instance

user = Instance(User, name=Attribute('John'))

user.greet()  # Hello, John

Context exit method arguments.

It should be possible to expect exception occurred within the context manager.

from primitives import Context, Exit, Argument

resource = Context(1, Exit(Argument(ValueError)))

with resource as r:
    r  # 1
    raise ValueError()  # Ok

with resource as r:
    r  # 1
    raise TypeError()  # Error

Generator yield value.

from primitives import Generator, Callable, Argument

genfunc = Callable(Generator(1, 2, 3), Argument('a'), Argument('b'))

it = genfunc('a', 'b')

next(it)  # 1

next(it)  # 2

next(it)  # 3

next(it)  # StopIteration

Class object constructors.

from primitives import Class, Instance, Callable, Variant

FkUser = Class(
    User,
    Variant(
        Callable(
            Instance(greet=Callable('Hello, John')),
            Argument('John'),
        ),
        Callable(
            Instance(greet=Callable(Exception())),
            Argument('Kate'),
        ),
    ),
)

j_user = FkUser('John')

user.greet()  # Hello, John

k_user = FkUser('Kate')

user.greet()  # Exception

Inherited Instance object can't define random methods.

from primitives import Callable, Instance

user = Instance(User, foo=Callable())
#                     ---
# `User` does not have `foo` method.

Generator send arguments.

from primitives import Generator, Send, Argument

gen = Generator(1, Send(3, Argument(2)))

it = gen()

next(it)  # 1

it.send(2)  # 3

Empty Awaitable object.

from primitives import Callable, Instance, Awaitable

user = Instance(greet=Callable(Awaitable('Hello, John')))

await user.greet()  # Hello, John

Empty Class object.

from primitives import Class

FkUser = Class()

inspect.isclass(FkUser)  # True

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