Swan tests
Redcode (ZJoyKiler) maintains the great collection of tests for Z80 cpu and for ZX Spectrum computer.
Tests for processor: https://github.com/redcode/Z80/wiki/Tests
Other tests for ZX Spectrum: https://github.com/redcode/ZXSpectrum/wiki/Tests
Swan tries to keep up with testing against new entries there.
Patrik Rak's test v. 1.2, z80full:
48K Fullscreen Multicolor Example:
