6502_65C02_functional_tests VS ProcessorTests

Klaus Dormann's 6502 tests don't rely on a particular emulator environment. They could be used with Ghidra.

https://github.com/Klaus2m5/6502_65C02_functional_tests

How about some assembler code to test all of the opcodes? https://github.com/klaus2m5/6502_65c02_functional_tests

https://github.com/Klaus2m5/6502_65C02_functional_tests might be worth a look, it's a comprehensive test suite

Great! (and not surprising). You may want to look into using a 6520 test suite to check correctness of your emulator, like this one -- note: I have no experience with it, but it took me some time to iron out the last error of my 6502 emulator, and in hindsight I should probably have used such test suite.

Currently i'm trying to implement 6502's instructions one by one using TDD. I was curious are there any test - corner cases already been written ? I found out ( https://github.com/Klaus2m5/6502_65C02_functional_tests ) but this requires all instructions to be implemented which I don't currently. Is there any way to test a single instruction in isolation for all the edge cases ?

By "bad branch", I mean the emulator takes the wrong branch because it fails to emulate some part of the Apple hardware properly. The 65C02 emulation has passed some pretty stringent tests (https://github.com/Klaus2m5/6502_65C02_functional_tests/blob/master/bin_files/65C02_extended_opcodes_test.lst), so I'm pretty confident in it. But the instruction trace file is around 90,000 lines, so is kinda hard to slog through.

If you want to test processor only, use https://github.com/TomHarte/ProcessorTests/tree/main/6502

Unit tests! Here are mine.

As part of development of JSMoo, my multi-system emulator, I implemented a series of 1,000+ tests per possible valid opcode (including undocumented opcodes). These tests are inspired by the amazing work of Tomas Harte at https://github.com/TomHarte/ProcessorTests , and after some people exercise them a bit I'd like it to be integrated there if he agrees.

I have added slightly more than a million 68000 test cases to my processor test collection.

Verify your 65816 and spc700 cores with this: https://github.com/TomHarte/ProcessorTests I contributed the spc700 tests and worked to improve and validate the 65816 tests. Neither core has had a single issue in any game so far.

I've yet really to go to town on producing public 68000 resources, but my limited contribution is: a complete list of [mostly-]decoded official 68000 instructions.