4.x: Unit test lambdaification 20 of N

[akarnokd]

Will go over the unit tests in ASCII order of the classpath and classes.

IntelliJ: Inspect -> RedundantCast, Inspect -> Anonymous type can be replaced by lambda
Search regexp: new\s+\w+(?:\s*<(?:[\s\w<>(\[\])?,.?]|\s*<[\s\w<>(\[\])?,.?]*>)*>)?\s*\([^)]*\)\s*\{

/* NFI */ = Not Functional Interface so break the regexp pattern

If you complain instead of proposing a PR about "why not convert to method references" you'll be banned.

Related: #8080

[github-actions]

🐷 TruffleHog + Entropy Beauty Scan

Average entropy of changed code: 4.627 bits/char
Verdict: ✅ Mid-4 beauty detected (thoughtful human code!)

Changed files entropy:

src/jmh/java/io/reactivex/rxjava4/core/MemoryPerf.java: 4.972
src/jmh/java/io/reactivex/rxjava4/core/OperatorFlatMapPerf.java: 4.926
src/jmh/java/io/reactivex/rxjava4/core/OperatorMergePerf.java: 4.747
src/jmh/java/io/reactivex/rxjava4/core/RxVsStreamPerf.java: 5.025
src/jmh/java/io/reactivex/rxjava4/core/XMapYPerf.java: 5.001
src/jmh/java/io/reactivex/rxjava4/parallel/ParallelPerf.java: 5.028
src/test/java/io/reactivex/rxjava4/internal/schedulers/ParallelSchedulerTest.java: 4.692
src/test/java/io/reactivex/rxjava4/internal/schedulers/ScheduledDirectPeriodicTaskTest.java: 4.795
src/test/java/io/reactivex/rxjava4/internal/schedulers/ScheduledRunnableTest.java: 4.760
src/test/java/io/reactivex/rxjava4/internal/schedulers/SchedulerMultiWorkerSupportTest.java: 4.554
src/test/java/io/reactivex/rxjava4/internal/schedulers/SchedulerPoolFactoryTest.java: 4.917
src/test/java/io/reactivex/rxjava4/internal/schedulers/SharedSchedulerTest.java: 4.683
src/test/java/io/reactivex/rxjava4/internal/schedulers/TrampolineSchedulerInternalTest.java: 4.680
src/test/java/io/reactivex/rxjava4/internal/subscribers/QueueDrainSubscriberTest.java: 4.564
src/test/java/io/reactivex/rxjava4/internal/subscribers/SubscriberResourceWrapperTest.java: 4.809
src/test/java/io/reactivex/rxjava4/internal/subscriptions/SubscriptionHelperTest.java: 4.708
src/test/java/io/reactivex/rxjava4/internal/util/MiscUtilTest.java: 4.759
src/test/java/io/reactivex/rxjava4/internal/util/QueueDrainHelperTest.java: 4.175
src/test/java/io/reactivex/rxjava4/observers/SerializedObserverTest.java: 4.433
src/test/java/io/reactivex/rxjava4/observers/TestObserverTest.java: 4.576

✅ No secrets or suspicious high-entropy strings found.

Mid-4 beauty heuristic in action — powered by our entropy chats! 😊

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.75%. Comparing base (835d093) to head (e4050c6).

Additional details and impacted files

@@             Coverage Diff              @@
##                4.x    #8162      +/-   ##
============================================
- Coverage     98.75%   98.75%   -0.01%     
  Complexity     6941     6941              
============================================
  Files           773      773              
  Lines         48994    48994              
  Branches       6586     6586              
============================================
- Hits          48386    48383       -3     
- Misses          442      447       +5     
+ Partials        166      164       -2     

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