4.x: Unit test lambdaification 15 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: 4.833 bits/char
Verdict: ⚠️ Consider review — entropy outside sweet spot

Changed files entropy:

docs/How-To-Use-RxJava.md: 4.903
src/jmh/java/io/reactivex/rxjava4/core/BinaryFlatMapPerf.java: 4.968
src/jmh/java/io/reactivex/rxjava4/core/CallableAsyncPerf.java: 4.898
src/jmh/java/io/reactivex/rxjava4/core/EachTypeFlatMapPerf.java: 5.034
src/jmh/java/io/reactivex/rxjava4/core/FlatMapJustPerf.java: 5.156
src/jmh/java/io/reactivex/rxjava4/core/FlattenCrossMapPerf.java: 5.124
src/jmh/java/io/reactivex/rxjava4/core/FlattenJustPerf.java: 5.128
src/jmh/java/io/reactivex/rxjava4/core/FlattenRangePerf.java: 5.134
src/jmh/java/io/reactivex/rxjava4/core/ObservableFlatMapPerf.java: 5.122
src/jmh/java/io/reactivex/rxjava4/xmapz/FlowableConcatMapCompletablePerf.java: 5.113
src/jmh/java/io/reactivex/rxjava4/xmapz/FlowableConcatMapMaybeEmptyPerf.java: 5.149
src/jmh/java/io/reactivex/rxjava4/xmapz/FlowableFlatMapCompletablePerf.java: 5.117
src/jmh/java/io/reactivex/rxjava4/xmapz/FlowableFlatMapMaybeEmptyPerf.java: 5.143
src/jmh/java/io/reactivex/rxjava4/xmapz/FlowableFlatMapMaybePerf.java: 5.137
src/jmh/java/io/reactivex/rxjava4/xmapz/FlowableFlatMapSinglePerf.java: 5.131
src/test/java/io/reactivex/rxjava4/internal/operators/flowable/FlowableRefCountTest.java: 4.466
src/test/java/io/reactivex/rxjava4/internal/operators/flowable/FlowableSkipLastTest.java: 4.936
src/test/java/io/reactivex/rxjava4/internal/operators/flowable/FlowableSkipTest.java: 4.870
src/test/java/io/reactivex/rxjava4/internal/operators/flowable/FlowableSkipUntilTest.java: 4.784
src/test/java/io/reactivex/rxjava4/internal/operators/flowable/FlowableTakeLastOneTest.java: 4.754

✅ 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 98.72%. Comparing base (b1bd8e0) to head (4dec3eb).

Additional details and impacted files

@@             Coverage Diff              @@
##                4.x    #8156      +/-   ##
============================================
- Coverage     98.74%   98.72%   -0.03%     
  Complexity     6934     6934              
============================================
  Files           773      773              
  Lines         48990    48990              
  Branches       6586     6586              
============================================
- Hits          48375    48365      -10     
- Misses          453      456       +3     
- Partials        162      169       +7     

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