4.x: Unit test lambdaification 2 of N

[akarnokd]

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

Search regexp: new\s+\w+(?:\s*<[^>]+>)?\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: 4.768 bits/char
Verdict: ⚠️ Consider review — entropy outside sweet spot

Changed files entropy:

docs/Plugins.md: 4.931
src/jmh/java/io/reactivex/rxjava4/core/TakeUntilPerf.java: 4.868
src/test/java/io/reactivex/rxjava4/completable/CompletableIsolatedTest.java: 4.791
src/test/java/io/reactivex/rxjava4/completable/CompletableRetryTest.java: 4.658
src/test/java/io/reactivex/rxjava4/completable/CompletableTest.java: 4.550
src/test/java/io/reactivex/rxjava4/completable/CompletableTimerTest.java: 4.976
src/test/java/io/reactivex/rxjava4/core/TransformerTest.java: 4.604

✅ 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 98.77%. Comparing base (881f84d) to head (806fdc9).

Additional details and impacted files

@@            Coverage Diff            @@
##                4.x    #8138   +/-   ##
=========================================
  Coverage     98.76%   98.77%           
- Complexity     6873     6874    +1     
=========================================
  Files           769      769           
  Lines         48659    48659           
  Branches       6516     6516           
=========================================
+ Hits          48058    48062    +4     
+ Misses          460      457    -3     
+ Partials        141      140    -1     

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