[show output]
Actual output:
Expected output:
- Failed assertion: got pixel [0,0,0,0] at (25,25), expected [191,191,63,63] +/- 3
- Failed assertion: got pixel [0,0,0,0] at (50,25), expected [127,127,127,127] +/- 3
- Failed assertion: got pixel [0,0,0,0] at (75,25), expected [63,63,191,191] +/- 3