How do you test asynchronous code in .NET?

Short answer: Mark test methods with async Task and use await to call asynchronous methods. Most test frameworks like xUnit, NUnit, and MSTest support async tests natively. [TestMethod] public async Task AsyncMethod_ShouldReturnTrue()

Example code

{
var result = await myService.DoWorkAsync(); Assert.IsTrue(result); }

Real-world example (ShopNest)

ShopNest unit tests cover pricing and discount rules so a bad coupon change fails in CI before customers see it.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.