Add tests for different concepts in python

src/test/resources/de/hhu/stups/codegenerator/RecordAccessNested3.stpy

+if __name__ == '__main__':
+    record = RecordAccessNested3()
+    record.calculate()
+    print(record.getRes())
\ No newline at end of file

src/test/resources/de/hhu/stups/codegenerator/RecordsAccess3.stpy

+if __name__ == '__main__':
+    record = RecordsAccess3()
+    record.calculate()
+    print(record.getRes())
\ No newline at end of file

src/test/resources/de/hhu/stups/codegenerator/Swap2Addition.stpy

+if __name__ == '__main__':
+    swap = Swap2()
+    swap.swap()
+    print(swap.getXX() + " ")
+    print(swap.getYY())
\ No newline at end of file

src/test/resources/de/hhu/stups/codegenerator/SwapAddition.stpy

+if __name__ == '__main__':
+    swap = Swap()
+    swap.swap()
+    print(swap.getXX())
+    print(swap.getYY())
\ No newline at end of file

src/test/resources/de/hhu/stups/codegenerator/UnionAddition.stpy

+if __name__ == '__main__':
+    union = Union()
+    union.calculate()
+    print(union.getRes())
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src/test/resources/de/hhu/stups/codegenerator/WhileAddition.stpy

+if __name__ == '__main__':
+    while1 = While()
+    print(while1.Inc(BInteger(1)))
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