TODO: Implement thorough testbench

[rejunity]

• ZEXALL test suite with "illegal" instructions https://mdfs.net/Software/Z80/Exerciser, https://mdfs.net/Software/Z80/Exerciser/Spectrum/
• Modern JSON based test-suite (related to JSMoo emulator): https://github.com/SingleStepTests/z80
• z80test suite for "undocumented" flag behaviors and MEMPTR register https://github.com/raxoft/z80test
• ZX Spectrum suite including MEMPTR register [https://web.archive.org/web/20130511214919id_/http://homepage.ntlworld.com/mark.woodmass/z80tests.tap]

Also check test suite: https://github.com/redcode/Z80/wiki/Tests
And hardware recordings: https://stardot.org.uk/forums/viewtopic.php?t=15464

[redcode]

You should also take a look at this: https://github.com/SingleStepTests/z80

[rejunity]

You should also take a look at this: https://github.com/SingleStepTests/z80

This looks great! Thank you for a hint!
I updated the list above.