4x unit test lambdas18

[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

Also fixed the ParallelScheduler test leak, detected in #8159.

[github-actions]

🐷 TruffleHog + Entropy Beauty Scan

Average entropy of changed code: 4.647 bits/char
Verdict: ✅ Mid-4 beauty detected (thoughtful human code!)

Changed files entropy:

src/main/java/io/reactivex/rxjava4/internal/schedulers/SchedulerToExecutorService.java: 4.455
src/test/java/io/reactivex/rxjava4/internal/schedulers/SchedulerToExecutorServiceTest.java: 4.839

✅ No secrets or suspicious high-entropy strings found.

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

[github-actions]

🐷 TruffleHog + Entropy Beauty Scan

Average entropy of changed code: 4.647 bits/char
Verdict: ✅ Mid-4 beauty detected (thoughtful human code!)

Changed files entropy:

src/main/java/io/reactivex/rxjava4/internal/schedulers/SchedulerToExecutorService.java: 4.455
src/test/java/io/reactivex/rxjava4/internal/schedulers/SchedulerToExecutorServiceTest.java: 4.839

✅ No secrets or suspicious high-entropy strings found.

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

[github-actions]

🐷 TruffleHog + Entropy Beauty Scan

Average entropy of changed code: 4.647 bits/char
Verdict: ✅ Mid-4 beauty detected (thoughtful human code!)

Changed files entropy:

src/main/java/io/reactivex/rxjava4/internal/schedulers/SchedulerToExecutorService.java: 4.455
src/test/java/io/reactivex/rxjava4/internal/schedulers/SchedulerToExecutorServiceTest.java: 4.839

✅ No secrets or suspicious high-entropy strings found.

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

[codecov]

Codecov Report

❌ Patch coverage is 40.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.76%. Comparing base (bb5ea04) to head (19dfae5).
⚠️ Report is 1 commits behind head on 4.x.

Files with missing lines	Patch %	Lines
.../reactivex/rxjava4/subscribers/TestSubscriber.java	0.00%	5 Missing ⚠️
...a/io/reactivex/rxjava4/observers/TestObserver.java	80.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (40.00%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##                4.x    #8160      +/-   ##
============================================
+ Coverage     98.75%   98.76%   +0.01%     
- Complexity     6934     6940       +6     
============================================
  Files           773      773              
  Lines         48984    48994      +10     
  Branches       6586     6586              
============================================
+ Hits          48372    48387      +15     
+ Misses          454      442      -12     
- Partials        158      165       +7     

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