tests/basics/list_slice_3arg: Add more tests for negative slicing.
tests/basics/list_slice_3arg: Add more tests for negative slicing.

micropython/micropython-esp32,chrisdearman/micropython,HenrikSolver/micropython,pfalcon/micropython,bvernoux/micropython,alex-robbins/micropython,Timmenem/micropython,hiway/micropython,MrSurly/micropython-esp32,chrisdearman/micropython,tobbad/micropython,adafruit/circuitpython,blazewicz/micropython,MrSurly/micropython-esp32,infinnovation/micropython,swegener/micropython,hiway/micropython,TDAbboud/micropython,lowRISC/micropython,pfalcon/micropython,cwyark/micropython,SHA2017-badge/micropython-esp32,adafruit/micropython,henriknelson/micropython,tralamazza/micropython,pfalcon/micropython,cwyark/micropython,adafruit/micropython,Timmenem/micropython,oopy/micropython,trezor/micropython,blazewicz/micropython,pramasoul/micropython,infinnovation/micropython,kerneltask/micropython,tobbad/micropython,blazewicz/micropython,trezor/micropython,ryannathans/micropython,blazewicz/micropython,pozetroninc/micropython,MrSurly/micropython-esp32,pfalcon/micropython,hiway/micropython,bvernoux/micropython,SHA2017-badge/micropython-esp32,chrisdearman/micropython,lowRISC/micropython,swegener/micropython,cwyark/micropython,pramasoul/micropython,MrSurly/micropython,ryannathans/micropython,cwyark/micropython,MrSurly/micropython,adafruit/micropython,pozetroninc/micropython,henriknelson/micropython,AriZuu/micropython,dmazzella/micropython,selste/micropython,infinnovation/micropython,TDAbboud/micropython,deshipu/micropython,AriZuu/micropython,cwyark/micropython,alex-robbins/micropython,MrSurly/micropython,henriknelson/micropython,AriZuu/micropython,hiway/micropython,HenrikSolver/micropython,micropython/micropython-esp32,torwag/micropython,oopy/micropython,adafruit/circuitpython,pozetroninc/micropython,infinnovation/micropython,tobbad/micropython,infinnovation/micropython,AriZuu/micropython,selste/micropython,adafruit/circuitpython,tobbad/micropython,ryannathans/micropython,SHA2017-badge/micropython-esp32,alex-robbins/micropython,pramasoul/micropython,micropython/micropython-esp32,dmazzella/micropython,kerneltask/micropython,TDAbboud/micropython,swegener/micropython,MrSurly/micropython-esp32,Timmenem/micropython,HenrikSolver/micropython,torwag/micropython,ryannathans/micropython,tobbad/micropython,kerneltask/micropython,PappaPeppar/micropython,selste/micropython,Timmenem/micropython,selste/micropython,tralamazza/micropython,oopy/micropython,TDAbboud/micropython,trezor/micropython,tralamazza/micropython,MrSurly/micropython,deshipu/micropython,alex-robbins/micropython,torwag/micropython,kerneltask/micropython,trezor/micropython,adafruit/micropython,pramasoul/micropython,lowRISC/micropython,Timmenem/micropython,dmazzella/micropython,PappaPeppar/micropython,ryannathans/micropython,swegener/micropython,pfalcon/micropython,deshipu/micropython,swegener/micropython,tralamazza/micropython,selste/micropython,HenrikSolver/micropython,AriZuu/micropython,micropython/micropython-esp32,PappaPeppar/micropython,lowRISC/micropython,torwag/micropython,blazewicz/micropython,oopy/micropython,bvernoux/micropython,MrSurly/micropython,SHA2017-badge/micropython-esp32,trezor/micropython,pozetroninc/micropython,henriknelson/micropython,PappaPeppar/micropython,micropython/micropython-esp32,adafruit/micropython,bvernoux/micropython,lowRISC/micropython,deshipu/micropython,deshipu/micropython,bvernoux/micropython,dmazzella/micropython,adafruit/circuitpython,oopy/micropython,kerneltask/micropython,MrSurly/micropython-esp32,hiway/micropython,chrisdearman/micropython,adafruit/circuitpython,henriknelson/micropython,TDAbboud/micropython,pramasoul/micropython,alex-robbins/micropython,HenrikSolver/micropython,chrisdearman/micropython,torwag/micropython,pozetroninc/micropython,adafruit/circuitpython,PappaPeppar/micropython,SHA2017-badge/micropython-esp32