Test fixtures for kmptoolkit-uploader: InMemoryUploaderStore, a complete UploaderStore you can run the real engine against without a database; UploaderStoreContract, which checks every invariant the store SPI promises so your own implementation can prove it holds them; FakeUploader for testing code that merely enqueues; plus a recording wake scheduler, a hand-driven constraint provider, and a movable clock. Pick this module as a testImplementation dependency alongside kmptoolkit-uploader.