Gemma now has a test that runs the IBM Logo and verifies the video is as expected when done.

gemma/src/chip8/instructions.rs

@@ -1190,7 +1190,7 @@ mod test {
         x.registers.poke(0x1, 0x10);
         x.registers.poke(0x2, 0x08);
         Chip8CpuInstructions::SubVxVy(0x1, 0x02).execute(&mut x);
-        assert_eq!(x.registers.peek(0xf), 0);
+        assert_eq!(x.registers.peek(0xf), 1);
         assert_eq!(x.registers.peek(0x1), 0x8);
         assert_eq!(x.registers.peek_pc(), 0x202);
     }
@@ -1249,7 +1249,7 @@ mod test {
         // expect the result to be 0x0b
         assert_eq!(x.registers.peek(0x1), 0x0b);
         // expect the vf register to be set to 1 as there was overflow
-        assert_eq!(x.registers.peek(0xf), 0x0);
+        assert_eq!(x.registers.peek(0xf), 0x1);
 
         let mut x = Chip8Computer::new();
         x.registers.poke(0x01, 0xab);
@@ -1258,7 +1258,7 @@ mod test {
 
         // expect the result to be 11110101, -0xB, -11, 245, 0xF5
         assert_eq!(x.registers.peek(0x1), 0xf5);
-        assert_eq!(x.registers.peek(0xf), 0x1);
+        assert_eq!(x.registers.peek(0xf), 0x0);
     }
 
     #[test]

gemma/tests/computer_tests.rs

@@ -6,11 +6,17 @@ fn smoke() { assert!(true) }
 #[test]
 fn test_rom_1_works() {
     let mut x = Chip8Computer::new();
-    // Load the IBM rom and run it...
+    // Load the IBM rom and run it.
+    // it takes 39 cycles to get to the end so lets run it 40.
+    
+    let test_rom_to_run = std::fs::read("../resources/roms/2-ibm-logo.ch8").unwrap();
+    x.load_bytes_to_memory(0x200, test_rom_to_run.into());
 
+    for i in 0..40 {
+        x.step_system();
+    }
     // ...then verify that the current video memory of the chip-8
     // simulator matches what we expect it to be
 
-    assert_eq!(x.dump_video_to_string(), );
-
+    assert_eq!(x.dump_video_to_string(), std::fs::read_to_string("../resources/test/gemma_integration_ibm_rom_output.asc").unwrap());
 }