Feature: Test Fakes (ManagedCode.Storage.TestFakes)

Purpose

Provide lightweight storage doubles for tests and demos, allowing consumers to replace real provider registrations without provisioning cloud resources.

These fakes are intended for fast tests where provider-specific behaviour is not the subject under test.

Main Flows

• Register a real provider (for production wiring).
• Replace it with a fake in tests using DI replacement helpers.

flowchart LR
  App[App/Test] --> DI[DI container]
  DI --> Real[Real provider registration]
  DI --> Fake["Replace*() -> Fake provider"]
  Fake --> Tests[Fast tests without cloud accounts]

Components

• ManagedCode.Storage.TestFakes/FakeAzureStorage.cs
• ManagedCode.Storage.TestFakes/FakeAzureDataLakeStorage.cs
• ManagedCode.Storage.TestFakes/FakeAWSStorage.cs
• ManagedCode.Storage.TestFakes/FakeGoogleStorage.cs
• ManagedCode.Storage.TestFakes/MockCollectionExtensions.cs (replacement helpers)

Current Behavior

• Fakes are resolved through Microsoft.Extensions.DependencyInjection and implement the same provider interfaces as the real storages.
• Prefer full integration tests (Testcontainers / HTTP fakes) for verifying provider-specific behaviour; use fakes for “consumer wiring” tests.

Tests

• Tests/ManagedCode.Storage.Tests/ExtensionsTests/ReplaceExtensionsTests.cs