Added nested block unit tests.
Added nested block unit tests.

zetlen/swig,Lochlan/swig,Thunf/swiger,gold3bear/swig,mahdaen/swig,mrazvan92/swig-template-callback,zongkelong/swig,zetlen/swig,DragWeb/swig,zongkelong/swig,Lochlan/swig,jrvldam/swig,cwhatley/swig,notthetup/swig,xiaoyang2022/swig,zetlen/swig,benpptung/swig,mrazvan92/swig-async,notthetup/swig,Thunf/swiger,genify/swig,cwhatley/swig,genify/swig,paularmstrong/swig,zongkelong/swig,cgvarela/swig,benpptung/swig,mrazvan92/swig-template-callback,CuteSephiroth/swig,DragWeb/swig,mahdaen/swig,mrazvan92/swig-async,xiaoyang2022/swig,mahdaen/swig,xiaoyang2022/swig,cgvarela/swig,cgvarela/swig,paularmstrong/swig,gold3bear/swig,Thunf/swiger,jerrylin1002/swig,gogobook/swig,CuteSephiroth/swig,gitoneman/swig,gogobook/swig,cwhatley/swig,Lochlan/swig,paularmstrong/swig,gold3bear/swig,benpptung/swig,CuteSephiroth/swig,gogobook/swig,gitoneman/swig,jrvldam/swig,mrazvan92/swig-template-callback,DragWeb/swig,mrazvan92/swig-async,gitoneman/swig,jerrylin1002/swig,jerrylin1002/swig,genify/swig,notthetup/swig,jrvldam/swig