Refactoring SingleSchedulerTest

[pwittchen]

Hi,

I refactored SingleSchedulerTest. Now it extends AbstractSchedulerTests, so redundant tests (with duplicated code) could be removed in favor of abstract tests. Now, thanks to the abstract test class, SingleScheduler has 21 unit tests instead of just 7. This approach is consistent with the test classes for other Schedulers.

Regards,
Piotr

[codecov]

Codecov Report

Merging #5462 into 2.x will increase coverage by 0.09%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5462      +/-   ##
============================================
+ Coverage     95.98%   96.07%   +0.09%     
- Complexity     5796     5804       +8     
============================================
  Files           631      631              
  Lines         41306    41306              
  Branches       5745     5745              
============================================
+ Hits          39647    39686      +39     
+ Misses          648      635      -13     
+ Partials       1011      985      -26

Impacted Files	Coverage Δ	Complexity Δ
...ternal/operators/flowable/FlowableSubscribeOn.java	91.52% <0%> (-6.78%)	2% <0%> (ø)
.../operators/completable/CompletableConcatArray.java	93.75% <0%> (-6.25%)	2% <0%> (ø)
.../internal/operators/maybe/MaybeTakeUntilMaybe.java	93.87% <0%> (-6.13%)	2% <0%> (ø)
...in/java/io/reactivex/subjects/BehaviorSubject.java	84.89% <0%> (-5.73%)	56% <0%> (ø)
...nternal/operators/parallel/ParallelSortedJoin.java	90.57% <0%> (-4.35%)	2% <0%> (ø)
...erators/completable/CompletableConcatIterable.java	95.91% <0%> (-4.09%)	2% <0%> (ø)
...reactivex/internal/operators/maybe/MaybeUsing.java	93.93% <0%> (-4.05%)	4% <0%> (ø)
...ernal/operators/maybe/MaybeTakeUntilPublisher.java	96% <0%> (-4%)	2% <0%> (ø)
...internal/operators/completable/CompletableAmb.java	94.91% <0%> (-3.39%)	10% <0%> (-1%)
.../internal/operators/flowable/FlowableInterval.java	94.44% <0%> (-2.78%)	3% <0%> (ø)
... and 50 more

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