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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.

Concept questionMedium~7 min

Make time, randomness, and generated ids testable

Controls nondeterministic inputs without weakening production behavior or hard-coding test-only branches.

.NETC#xUnit

Concept questionEasy~5 min

Structure xUnit tests and fixture lifetimes

Structures 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 questionMedium~7 min

Test async code, cancellation, and timeouts

Tests asynchronous completion, caller cancellation, owned timeouts, cleanup, and race-sensitive side effects deterministically with controlled dependencies and bounded diagnostics.