Testing the untestable PART II – patterns, use cases and practices
summary
Shows concrete techniques: use jQuick property-based tests (default 1,000 tries, author recommends 10,000 for text) and it found a missed edge case (library reported 8 edge cases, author had 7), inject caches by making constructors protected and use fixture subclasses to supply a test cache, separate retry policy into a decorator and test it with a failing fake using FailSafe (retry policy maxRetries=3), make executors explicit and use a deterministic scheduler or ThreadsCollider/JCStress for concurrency, test logs with an SLF4J test appender, and use EqualsVerifier for BigDecimal equality pitfalls; testcontainers must match production versions.
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chapters (10)
- 0:00Introduction and motivation
- 2:29Testing value objects with PBT
- 15:32Testing internal caches
- 18:47Testing private immutable fields
- 21:17Fault tolerance and resilience
- 27:27Multi-threading and concurrency
- 33:53Testing logging as a feature
- 39:42Testing equals and hashCode
- 41:55Testing persistence options
- 44:04Summary and feedback
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