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API Testing Labs - .NET Backend | Aporeon

API Testing Labs

Hands-on ASP.NET Core integration, reliability, observability, incident, and regression exercises.

15 drillsPractice one at a timeOrdered pathCoding problem

Recommended start

Authenticated Endpoint Test

Uses WebApplicationFactory with test-only authentication and isolated dependencies to exercise the real ASP.NET Core pipeline.

Easy~15 minStep 1 of 15

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1Authenticated Endpoint TestRecommended startUses WebApplicationFactory with test-only authentication and isolated dependencies to exercise the real ASP.NET Core pipeline.Coding problemEasy~15 min.NETASP.NET CoreC#Practice

Practice order

15 drillsOne at a time

1Authenticated Endpoint TestUp next / Easy / ~15 min
2Capability MatrixMedium / ~25 min
3Ownership BoundaryMedium / ~25 min
4

2

Capability MatrixExpresses allowed and denied capability combinations as one parameterized API integration test.Coding problemMedium~25 min.NETASP.NET CoreC#

Practice

3Ownership BoundaryProves that one authenticated user cannot read or modify another user's private resource.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

4Validation ContractVerifies status, content type, stable error extensions, and field errors for an invalid API request.Coding problemEasy~15 min.NETASP.NET CoreC#Practice

5Idempotent POSTProves repeated requests with one idempotency key create one resource and return a consistent result.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

6Pagination RegressionWalks API pages through equal sort values and verifies no duplicate or missing resource ids.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

7Downstream CancellationUses a controllable fake HTTP handler to prove request cancellation reaches a downstream dependency.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

8Concurrency Integration TestUses two isolated EF Core contexts to reproduce a real optimistic-concurrency conflict through the API boundary.Coding problemHard~35 min.NETASP.NET CoreC#Practice

9Database Command GuardUses a test-only DbCommandInterceptor to fail a regression when database command count grows with page size.Coding problemHard~35 min.NETASP.NET CoreC#Practice

10Correlated ErrorTests that an unexpected failure returns a safe correlation identifier and records the same value in structured logs.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

11Trace PropagationCaptures test activities to prove one incoming request and its outgoing HTTP dependency share trace context.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

12Connection Pool PressurePairs a bounded isolated reproduction with telemetry and a disposal fix for leaked database connections.Coding problemHard~35 min.NETASP.NET CoreC#Practice

13Readiness CheckBuilds a bounded readiness check for one required dependency while keeping liveness independent and responses non-sensitive.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

14Incident RegressionTurns a production-only role and payload failure into the smallest durable API regression test.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

15Post-Deploy SmokeChecks health, authentication, and one critical read flow after deployment without creating persistent business data.Coding problemEasy~15 min.NETASP.NET CoreC#Practice

Validation Contract

Easy / ~15 min

5Idempotent POSTMedium / ~25 min

6Pagination RegressionMedium / ~25 min

7Downstream CancellationMedium / ~25 min

8Concurrency Integration TestHard / ~35 min

+7 more drills in this section