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Aporeon interview preparation

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Testing & Quality

Spoken testing strategy, xUnit, integration, database, contract, and suite-reliability questions.

20 drillsPractice one at a timeOrdered pathComparison questionConcept questionArchitecture scenarioDebugging scenario

Recommended start

Choose Test Level

Explains how unit, integration, contract, component, and end-to-end tests cover different failure boundaries.

Easy~5 minStep 1 of 20

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1Choose Test LevelRecommended startExplains how unit, integration, contract, component, and end-to-end tests cover different failure boundaries.Comparison questionEasy~5 min.NETC#xUnitPractice 2

Practice order

20 drillsOne at a time

1Choose Test LevelUp next / Easy / ~5 min
2Valuable Unit TestsEasy / ~5 min
3Behavior Over InternalsMedium / ~7 min
4

Valuable Unit TestsFocuses unit tests on stable behavior, meaningful boundaries, deterministic outcomes, and useful failure messages.Concept questionEasy~5 min.NETC#xUnit

Practice

3Behavior Over InternalsDistinguishes observable contracts from incidental calls while preserving important interaction assertions.Concept questionMedium~7 min.NETC#xUnitPractice

4Risk-Based CoverageBuilds a proportionate test plan from blast radius, failure probability, detectability, and reversibility.Architecture scenarioMedium~10 min.NETASP.NET CoreC#Practice

5xUnit FixturesStructures xUnit tests around per-test instances and shares only expensive infrastructure through deliberate class, collection, or assembly fixture lifetimes while preserving isolation and parallel safety.Concept questionEasy~5 min.NETC#xUnitPractice

6Test DoublesCompares test doubles by purpose and explains when a real dependency provides a more trustworthy test.Comparison questionMedium~7 min.NETC#xUnitPractice

7Async Test DesignTests asynchronous completion, caller cancellation, owned timeouts, cleanup, and race-sensitive side effects deterministically with controlled dependencies and bounded diagnostics.Concept questionMedium~7 min.NETC#xUnitPractice

8Deterministic InputsControls nondeterministic inputs without weakening production behavior or hard-coding test-only branches.Concept questionMedium~7 min.NETC#xUnitPractice

9WebApplicationFactoryUses the real ASP.NET Core pipeline while replacing only environment-specific boundaries deliberately.Concept questionMedium~7 min.NETASP.NET CoreC#Practice

10Database IsolationCompares rollback, reset, schema, database, and tenant isolation without hiding transaction or parallelism limits.Comparison questionHard~9 min.NETASP.NET CoreC#Practice

11Database Test FidelityChooses database test infrastructure by the provider behavior a test must prove.Comparison questionMedium~7 min.NETASP.NET CoreC#Practice

12API Contract TestsCombines schema diffing, real provider tests, consumer expectations, generated clients, semantic scenarios, and rollout evidence to prevent accidental API breaks.Concept questionMedium~7 min.NETASP.NET CoreC#Practice

13Flaky Test DiagnosisTreats flakiness as an observable defect in timing, state, order, infrastructure, or product behavior.Debugging scenarioMedium~10 min.NETC#xUnitPractice

14Parallel Test IsolationUses unique namespaces and correctly scoped fixtures so parallel tests improve speed without creating collisions.Architecture scenarioMedium~10 min.NETASP.NET CoreC#Practice

15External Dependency TestsCombines protocol stubs, contract checks, sandbox tests, and failure simulation without depending on live production services.Architecture scenarioHard~12 min.NETASP.NET CoreC#Practice

16Fast, Trusted SuiteDesigns a reliable CI test system with fast feedback, deliberate test stages, bounded parallelism, visible flakiness, useful diagnostics, and clear ownership.Architecture scenarioHard~12 min.NETC#xUnitPractice

17Authorization TestsDesigns integration tests for authentication, capabilities, ownership, account status, and cross-tenant isolation without bypassing the real authorization pipeline.Architecture scenarioMedium~10 min.NETASP.NET CoreC#Practice

18Worker & Consumer TestsTests durable background processing across duplicate delivery, retries, acknowledgement timing, crashes, poison messages, and observable completion.Architecture scenarioMedium~10 min.NETC#SQL ServerPractice

19Migration Compatibility TestsVerifies migration SQL, data preservation, production-provider behavior, mixed application versions, backfills, and expand-contract releases.Architecture scenarioHard~12 min.NETC#EF CorePractice

20Performance Test StrategyDesigns realistic load, stress, spike, and soak tests from workload assumptions and SLOs while correlating client results with server bottlenecks.Architecture scenarioHard~12 min.NETASP.NET CoreC#Practice

Risk-Based Coverage

Medium / ~10 min

5xUnit FixturesEasy / ~5 min

6Test DoublesMedium / ~7 min

7Async Test DesignMedium / ~7 min

8Deterministic InputsMedium / ~7 min

+12 more drills in this section

Testing & Quality - .NET Backend | Aporeon