4.x: Unit test lambdaification 7 of N

[akarnokd]

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

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: 4.672 bits/char
Verdict: ✅ Mid-4 beauty detected (thoughtful human code!)

Changed files entropy:

src/test/java/io/reactivex/rxjava4/core/ConverterTest.java: 4.613
src/test/java/io/reactivex/rxjava4/flowable/FlowableCovarianceTest.java: 4.812
src/test/java/io/reactivex/rxjava4/flowable/FlowableDoOnTest.java: 4.780
src/test/java/io/reactivex/rxjava4/flowable/FlowableGroupByTests.java: 4.907
src/test/java/io/reactivex/rxjava4/flowable/FlowableMergeTests.java: 4.897
src/test/java/io/reactivex/rxjava4/flowable/FlowableNullTests.java: 4.915
src/test/java/io/reactivex/rxjava4/flowable/FlowableSubscriberTest.java: 4.438
src/test/java/io/reactivex/rxjava4/flowable/FlowableZipTests.java: 4.838
src/test/java/io/reactivex/rxjava4/internal/jdk8/ParallelMapOptionalTest.java: 4.567
src/test/java/io/reactivex/rxjava4/internal/observers/LambdaObserverTest.java: 4.587
src/test/java/io/reactivex/rxjava4/internal/observers/ObservableConsumersTest.java: 4.672
src/test/java/io/reactivex/rxjava4/internal/observers/QueueDrainObserverTest.java: 4.577
src/test/java/io/reactivex/rxjava4/internal/observers/SingleConsumersTest.java: 4.714
src/test/java/io/reactivex/rxjava4/internal/operators/completable/CompletableAmbTest.java: 4.651
src/test/java/io/reactivex/rxjava4/internal/operators/completable/CompletableAndThenCompletableTest.java: 4.391
src/test/java/io/reactivex/rxjava4/internal/operators/completable/CompletableCacheTest.java: 4.596
src/test/java/io/reactivex/rxjava4/internal/operators/completable/CompletableConcatTest.java: 4.583
src/test/java/io/reactivex/rxjava4/internal/operators/completable/CompletableCreateTest.java: 4.276
src/test/java/io/reactivex/rxjava4/internal/operators/completable/CompletableDelaySubscriptionTest.java: 4.852
src/test/java/io/reactivex/rxjava4/internal/operators/completable/CompletableDelayTest.java: 4.871

✅ 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 (c277517) to head (0c39c8d).

Additional details and impacted files

@@             Coverage Diff              @@
##                4.x    #8143      +/-   ##
============================================
- Coverage     98.78%   98.77%   -0.02%     
+ Complexity     6874     6873       -1     
============================================
  Files           769      769              
  Lines         48659    48659              
  Branches       6516     6516              
============================================
- Hits          48067    48062       -5     
- Misses          455      460       +5     
  Partials        137      137              

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.