How do I test cache expiration without waiting in real-time?

By using the FakeTimeProvider.Advance(TimeSpan) method, you can instantly jump the clock forward in your test environment, triggering expiration logic without any real-world delay.

Why should I use TimeProvider instead of DateTime.Now?

DateTime.Now is a static property that makes code non-deterministic and hard to test. TimeProvider allows you to inject time as a service, which can be swapped with FakeTimeProvider during tests to control exactly what 'now' means.

Can I test timezone-specific logic with this skill?

Yes, the skill covers using SetLocalTimeZone and SetLocalNow to simulate different geographic contexts, ensuring your application handles offsets and daylight savings correctly.

Does this support .NET 8 and .NET 9?

Yes, it specifically focuses on the Microsoft.Bcl.TimeProvider and Microsoft.Extensions.TimeProvider.Testing packages which are designed for modern .NET versions and back-compatible scenarios.

DotNet Time Testing with TimeProvider

Name: DotNet Time Testing with TimeProvider
Author: rudironsoni

byrudironsoni

•

Security & Testing

Streamlines testing of time-dependent .NET logic by implementing and manipulating TimeProvider and FakeTimeProvider abstractions.

This skill provides specialized guidance for refactoring .NET applications to use the TimeProvider abstraction, replacing static calls like DateTime.Now with testable dependencies. It offers implementation patterns for freezing time, fast-forwarding to test cache and token expirations, and managing timezone-sensitive logic. By leveraging Microsoft.Extensions.TimeProvider.Testing, it enables developers to create predictable, reproducible unit tests for complex temporal scenarios like business hour validation and scheduled task triggers.

Key Features

01Timezone-specific testing configurations

02Time manipulation techniques using Advance() and SetUtcNow()

032 GitHub stars

04Refactoring patterns for TimeProvider dependency injection

05AutoFixture integration for automated TimeProvider mocking

06Boundary testing for business hours and expiration logic

Use Cases

01Simulating race conditions and time-sensitive batch processing

02Testing cache and token expiration by fast-forwarding simulated time

03Validating business logic that depends on specific hours or holiday dates

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add rudironsoni/synaxis dotnet-testing-datetime-testing-timeprovider

For use in Claude.ai and ChatGPT

Key Features

01Timezone-specific testing configurations

02Time manipulation techniques using Advance() and SetUtcNow()

032 GitHub stars

04Refactoring patterns for TimeProvider dependency injection

05AutoFixture integration for automated TimeProvider mocking

06Boundary testing for business hours and expiration logic

Use Cases

01Simulating race conditions and time-sensitive batch processing

02Testing cache and token expiration by fast-forwarding simulated time

03Validating business logic that depends on specific hours or holiday dates

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add rudironsoni/synaxis dotnet-testing-datetime-testing-timeprovider

For use in Claude.ai and ChatGPT