[ 2644473 ] [Selftest] Define the selftest for the feature handling Python builtIn code in JSONP

[namsonx]

The feature handling Python builtIn code in JSONP is mentioned in #456

[HolQue]

Testcases implemented:
#462

Limitations:

• Tests are commented out
• Expected results not yet defined

Reason: Feature currently under construction

t.b.c.

[HolQue]

Mostly done with #465

But nevertheless, feature, docu and test are still under construction. => t.b.c.