Add test to import all modules to check validity of stubs (#56)

* add import_all.test builder

* fix errors

* fix typechecking errors

* fix migrations typechecking

django-stubs/contrib/sessions/backends/cache.pyi

@@ -1,23 +1,11 @@
-from typing import Any, Dict, Optional
+from typing import Any, Optional
 
 from django.contrib.sessions.backends.base import SessionBase
 
-from django.contrib.sessions.serializers import JSONSerializer
-
 KEY_PREFIX: str
 
 class SessionStore(SessionBase):
-    accessed: bool
-    serializer: JSONSerializer
     cache_key_prefix: Any = ...
     def __init__(self, session_key: Optional[str] = ...) -> None: ...
     @property
     def cache_key(self) -> str: ...
-    def load(self) -> Dict[str, str]: ...
-    modified: bool = ...
-    def create(self) -> None: ...
-    def save(self, must_create: bool = ...) -> None: ...
-    def exists(self, session_key: Optional[str]) -> bool: ...
-    def delete(self, session_key: Optional[str] = ...) -> None: ...
-    @classmethod
-    def clear_expired(cls) -> None: ...

django-stubs/contrib/sessions/backends/cached_db.pyi

@@ -1,19 +1,11 @@
-from typing import Any, Dict, Optional
+from typing import Any, Optional
 
 from django.contrib.sessions.backends.db import SessionStore as DBStore
 
 KEY_PREFIX: str
 
 class SessionStore(DBStore):
-    accessed: bool
-    modified: bool
-    serializer: Type[django.core.signing.JSONSerializer]
     cache_key_prefix: Any = ...
     def __init__(self, session_key: Optional[str] = ...) -> None: ...
     @property
     def cache_key(self) -> str: ...
-    def load(self) -> Dict[str, str]: ...
-    def exists(self, session_key: Optional[str]) -> bool: ...
-    def save(self, must_create: bool = ...) -> None: ...
-    def delete(self, session_key: Optional[str] = ...) -> None: ...
-    def flush(self) -> None: ...

django-stubs/contrib/sessions/backends/db.pyi

@@ -1,24 +1,13 @@
-from typing import Dict, Optional, Type, Union
+from typing import Dict, Optional, Type
 
 from django.contrib.sessions.backends.base import SessionBase
 from django.contrib.sessions.base_session import AbstractBaseSession
 from django.contrib.sessions.models import Session
-from django.core.signing import Serializer
 from django.db.models.base import Model
 
 class SessionStore(SessionBase):
-    accessed: bool
-    serializer: Type[Serializer]
     def __init__(self, session_key: Optional[str] = ...) -> None: ...
     @classmethod
     def get_model_class(cls) -> Type[Session]: ...
     def model(self) -> Type[AbstractBaseSession]: ...
-    def load(self) -> Dict[str, Union[Model, int, str]]: ...
-    def exists(self, session_key: Optional[str]) -> bool: ...
-    modified: bool = ...
-    def create(self) -> None: ...
     def create_model_instance(self, data: Dict[str, Model]) -> AbstractBaseSession: ...
-    def save(self, must_create: bool = ...) -> None: ...
-    def delete(self, session_key: Optional[str] = ...) -> None: ...
-    @classmethod
-    def clear_expired(cls) -> None: ...

django-stubs/contrib/sessions/backends/file.pyi

@@ -1,19 +1,9 @@
-from typing import Any, Dict, Optional, Union
+from typing import Optional
 
 from django.contrib.sessions.backends.base import SessionBase
 
 class SessionStore(SessionBase):
-    accessed: bool
-    serializer: Type[django.core.signing.JSONSerializer]
     storage_path: str = ...
     file_prefix: str = ...
     def __init__(self, session_key: Optional[str] = ...) -> None: ...
-    def load(self) -> Dict[str, Union[int, str]]: ...
-    modified: bool = ...
-    def create(self) -> None: ...
-    def save(self, must_create: bool = ...) -> None: ...
-    def exists(self, session_key: Optional[str]) -> bool: ...
-    def delete(self, session_key: Optional[str] = ...) -> None: ...
     def clean(self) -> None: ...
-    @classmethod
-    def clear_expired(cls) -> None: ...

django-stubs/contrib/sessions/backends/signed_cookies.pyi

@@ -1,17 +1,3 @@
-from datetime import datetime
-from typing import Any, Dict, Optional, Union
-
 from django.contrib.sessions.backends.base import SessionBase
 
-class SessionStore(SessionBase):
-    accessed: bool
-    serializer: Type[django.core.signing.JSONSerializer]
-    def load(self) -> Dict[str, Union[datetime, str]]: ...
-    modified: bool = ...
-    def create(self) -> None: ...
-    def save(self, must_create: bool = ...) -> None: ...
-    def exists(self, session_key: Optional[str] = ...) -> bool: ...
-    def delete(self, session_key: Optional[str] = ...) -> None: ...
-    def cycle_key(self) -> None: ...
-    @classmethod
-    def clear_expired(cls) -> None: ...
+class SessionStore(SessionBase): ...

django-stubs/contrib/sessions/management/commands/clearsessions.pyi

@@ -1,10 +1,3 @@
-from typing import Any, Optional
-
 from django.core.management.base import BaseCommand
 
-class Command(BaseCommand):
-    stderr: django.core.management.base.OutputWrapper
-    stdout: django.core.management.base.OutputWrapper
-    style: django.core.management.color.Style
-    help: str = ...
-    def handle(self, **options: Any) -> None: ...
+class Command(BaseCommand): ...