Chore: Move model factories to the shared test layer (#14170)

The model factories lived in the documents test package, but three other
apps needed them. The AI, mail and testing suites all reached across an app
boundary to import from documents.tests.factories, which made a private test
package into a shared dependency.

The factories now live in the shared testing package, where cross-app use is
the intended use.

src/paperless_testing/factories.py

@@ -0,0 +1,98 @@
+"""
+Factory-boy factories for documents app models.
+"""
+
+from __future__ import annotations
+
+import factory
+from django.contrib.auth import get_user_model
+from factory.django import DjangoModelFactory
+
+from documents.models import Correspondent
+from documents.models import Document
+from documents.models import DocumentType
+from documents.models import MatchingModel
+from documents.models import PaperlessTask
+from documents.models import StoragePath
+from documents.models import Tag
+
+UserModelT = get_user_model()
+
+
+class CorrespondentFactory(DjangoModelFactory[Correspondent]):
+    class Meta:
+        model = Correspondent
+
+    name = factory.Sequence(lambda n: f"{factory.Faker('company')} {n}")
+    match = ""
+    matching_algorithm = MatchingModel.MATCH_NONE
+
+
+class DocumentTypeFactory(DjangoModelFactory[DocumentType]):
+    class Meta:
+        model = DocumentType
+
+    name = factory.Sequence(lambda n: f"{factory.Faker('bs')} {n}")
+    match = ""
+    matching_algorithm = MatchingModel.MATCH_NONE
+
+
+class TagFactory(DjangoModelFactory[Tag]):
+    class Meta:
+        model = Tag
+
+    name = factory.Sequence(lambda n: f"{factory.Faker('word')} {n}")
+    match = ""
+    matching_algorithm = MatchingModel.MATCH_NONE
+    is_inbox_tag = False
+
+
+class StoragePathFactory(DjangoModelFactory[StoragePath]):
+    class Meta:
+        model = StoragePath
+
+    name = factory.Sequence(
+        lambda n: f"{factory.Faker('file_path', depth=2, extension='')} {n}",
+    )
+    path = factory.LazyAttribute(lambda o: f"{o.name}/{{title}}")
+    match = ""
+    matching_algorithm = MatchingModel.MATCH_NONE
+
+
+class DocumentFactory(DjangoModelFactory[Document]):
+    class Meta:
+        model = Document
+
+    title = factory.Faker("sentence", nb_words=4)
+    checksum = factory.Faker("sha256")
+    content = factory.Faker("paragraph")
+    correspondent = None
+    document_type = None
+    storage_path = None
+
+
+class UserFactory(DjangoModelFactory[UserModelT]):
+    class Meta:
+        model = UserModelT
+
+    username = factory.Sequence(lambda n: f"user{n}")
+    is_staff = False
+    is_superuser = False
+    password = factory.django.Password("test")
+
+    class Params:
+        superuser = factory.Trait(is_staff=True, is_superuser=True)
+        staff = factory.Trait(is_staff=True)
+
+
+class PaperlessTaskFactory(DjangoModelFactory[PaperlessTask]):
+    class Meta:
+        model = PaperlessTask
+
+    task_id = factory.Faker("uuid4")
+    task_type = PaperlessTask.TaskType.CONSUME_FILE
+    trigger_source = PaperlessTask.TriggerSource.WEB_UI
+    status = PaperlessTask.Status.PENDING
+    input_data = factory.LazyFunction(dict)
+    result_data = None
+    acknowledged = False