• What strategies do you use to refactor code that is difficult to unit test?

  • How do you measure the effectiveness of your unit tests?

  • How would you approachunit testingacomplex workflowinvolvingmultiple services or components?

  • How do you unit test code that interacts with cloud services likeAzureorAWS? Expertise Level: Mid-Level / Senior

  • How would you unit test a .NET Core application that uses gRPC?

  • How do youunit test codethat useslocalizationorinternationalizationfeatures?

  • How do you unit test code that uses logging frameworks? Mid-Level Expertise Required

  • How do you unit test code that interacts with security features like authentication and authorization?

  • How would you design unit tests for a complex business rule or validation logic ?

  • How do you approach unit testing when working with large datasets?

  • How do you unit test code that interacts with hardware or external devices? Mid Level Developer Required to Answer this Question

  • How do you handle testing code that uses background tasks or scheduled jobs ?

  • How do you approach unit testing in a continuous integration/continuous deployment (CI/CD) pipeline ?

  • How do you ensure that your unit tests run quickly and efficiently ?

  • How would you unit test a component that uses a third-party library with limited or no testability features ?

  • What are some best practices for organizing and structuring unit tests? Expertise Level: Mid Level

  • How do you unit test code that uses dependency injection with different lifetimes (e.g., Singleton, Scoped, Transient)?

  • How can you use mocking frameworks to simulate different error scenarios ?

  • Explain how to usedata-driven testinginunit tests.Expertise Level: Mid Level

  • How do you unit test a.NET Core APIcontroller? Mid/Senior Level

  • How do you deal with testing code that has external dependencies that are difficult to mock ?

  • How do you unit test code that uses caching mechanisms? Mid-Level

  • How do you handle testing code that interacts with file system operations ?

  • How do you ensure your unit tests are maintainable and don't become brittle ?

  • What are some common pitfalls to avoid when writing unit tests ?