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added automated doctest to decimal_to_hexadecimal.py in conversions (#1071)

* added automated doctest to decimal_to_hexadecimal.py in conversions

* improved error handling and added more test cases in decimal_to_hexadecimal.py

* implemented 0x notation and simplified AssertionError

* fixed negative notation and added comparison test against Python hex function
J
Jasper committed
3b63857b657ef9e552368d66fe536a0454c6307f
Parent: 46bc673
Committed by Christian Clauss <cclauss@me.com> on 7/26/2019, 4:28:32 PM