Technical interview questions and drills

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Showing the Testing & Quality Engineering curriculum. Technology tags describe each drill's actual implementation context; shared drills can belong to more than one track.

Comparison questionMedium~7 min

Choose between mocks, stubs, fakes, and real dependencies

Compares test doubles by purpose and explains when a real dependency provides a more trustworthy test.

In Testing & Quality EngineeringShared across 4 tracks

Comparison questionMedium

Drills

Choose between mocks, stubs, fakes, and real dependencies

Choose Testcontainers, SQLite, or EF Core InMemory

Choose test coverage from change risk

Choose the right test level for a change

Design a performance and load-test strategy

Design tests for safe parallel execution

Diagnose and fix a flaky test

Integration-test ASP.NET Core with WebApplicationFactory

Isolate database integration tests

Keep a growing test suite fast and trustworthy

Make time, randomness, and generated ids testable

Structure xUnit tests and fixture lifetimes

Test API contracts and compatibility

Test async code, cancellation, and timeouts

Test authorization and tenant isolation

Test background workers and message consumers

Test behavior without freezing implementation

Test database migrations and rolling compatibility

Test external dependency boundaries

What makes a unit test valuable?