Improve boxing/unboxing unit tests and remove useless code in isUnbox…

[jlerbsc]

The object of this PR is mainly to improve the codecov report

[codecov]

Codecov Report

Merging #2984 (aacec37) into master (6a09130) will decrease coverage by 0.013%.
The diff coverage is 100.000%.

@@               Coverage Diff               @@
##              master     #2984       +/-   ##
===============================================
- Coverage     54.963%   54.950%   -0.014%     
- Complexity      2437      2438        +1     
===============================================
  Files            602       602               
  Lines          33351     33348        -3     
  Branches        5629      5629               
===============================================
- Hits           18331     18325        -6     
- Misses         13155     13159        +4     
+ Partials        1865      1864        -1     

Flag	Coverage Δ	Complexity Δ
AlsoSlowTests	54.950% <100.000%> (-0.014%)	0.000 <0.000> (ø)
javaparser-core	50.517% <0.000%> (-0.008%)	0.000 <0.000> (ø)
javaparser-symbol-solver	39.678% <100.000%> (-0.018%)	0.000 <0.000> (ø)
jdk-10	54.920% <100.000%> (-0.009%)	0.000 <0.000> (ø)
jdk-11	54.920% <100.000%> (-0.009%)	0.000 <0.000> (ø)
jdk-12	54.920% <100.000%> (-0.009%)	0.000 <0.000> (ø)
jdk-13	54.920% <100.000%> (-0.009%)	0.000 <0.000> (ø)
jdk-14	54.920% <100.000%> (-0.009%)	0.000 <0.000> (ø)
jdk-15	54.950% <100.000%> (-0.009%)	0.000 <0.000> (ø)
jdk-8	50.515% <0.000%> (-4.419%)	0.000 <0.000> (ø)
jdk-9	50.513% <0.000%> (-4.416%)	0.000 <0.000> (ø)
macos-latest	?	?
ubuntu-latest	54.950% <100.000%> (+0.004%)	0.000 <0.000> (ø)
windows-latest	?	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...parser/resolution/types/ResolvedReferenceType.java	81.382% <100.000%> (+0.856%)	0.000 <0.000> (ø)
.../resolution/typesolvers/ClassLoaderTypeSolver.java	76.470% <0.000%> (-5.883%)	10.000% <0.000%> (ø%)
...urces/com/github/javaparser/TokenMgrException.java	69.230% <0.000%> (-5.129%)	0.000% <0.000%> (ø%)
...olver/resolution/typesolvers/MemoryTypeSolver.java	50.000% <0.000%> (-4.167%)	7.000% <0.000%> (-1.000%)
...nter/configuration/PrettyPrinterConfiguration.java	17.187% <0.000%> (-1.563%)	0.000% <0.000%> (ø%)
...ava/com/github/javaparser/utils/LineSeparator.java	83.076% <0.000%> (-1.539%)	0.000% <0.000%> (ø%)
...avaparsermodel/contexts/MethodCallExprContext.java	76.250% <0.000%> (-0.099%)	89.000% <0.000%> (ø%)
...er/symbolsolver/javaparsermodel/TypeExtractor.java	71.323% <0.000%> (+0.735%)	85.000% <0.000%> (+2.000%)

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