Add test cases for NoChange API

[jlerbsc]

No description provided.

[codecov]

Codecov Report

Merging #3431 (5adeee4) into master (e1fe9e8) will increase coverage by 0.007%.
The diff coverage is 85.714%.

@@               Coverage Diff               @@
##              master     #3431       +/-   ##
===============================================
+ Coverage     58.166%   58.173%   +0.007%     
  Complexity      2633      2633               
===============================================
  Files            628       628               
  Lines          34264     34265        +1     
  Branches        5843      5843               
===============================================
+ Hits           19930     19933        +3     
+ Misses         12292     12290        -2     
  Partials        2042      2042               

Flag	Coverage Δ
AlsoSlowTests	58.173% <85.714%> (+0.007%)	⬆️
javaparser-core	53.845% <ø> (+0.007%)	⬆️
javaparser-symbol-solver	35.885% <85.714%> (+0.001%)	⬆️
jdk-10	58.166% <85.714%> (+0.007%)	⬆️
jdk-11	58.166% <85.714%> (+0.007%)	⬆️
jdk-12	58.163% <85.714%> (+0.009%)	⬆️
jdk-13	58.166% <85.714%> (+0.009%)	⬆️
jdk-14	58.166% <85.714%> (+0.007%)	⬆️
jdk-15	58.166% <85.714%> (+0.007%)	⬆️
jdk-16	58.163% <85.714%> (+0.004%)	⬆️
jdk-8	58.170% <85.714%> (+0.012%)	⬆️
jdk-9	58.166% <85.714%> (+0.009%)	⬆️
macos-latest	58.164% <85.714%> (+0.007%)	⬆️
ubuntu-latest	58.152% <85.714%> (+0.007%)	⬆️
windows-latest	58.155% <85.714%> (+0.007%)	⬆️

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

Impacted Files	Coverage Δ
...mbolsolver/model/typesystem/ReferenceTypeImpl.java	85.046% <85.714%> (+0.141%)	⬆️
...ub/javaparser/ast/observer/ObservableProperty.java	86.127% <0.000%> (+1.156%)	⬆️

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