620 lines
20 KiB
Rust
620 lines
20 KiB
Rust
mod test_utils;
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use log::debug;
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use gemma::chip8::computer::Chip8Computer;
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use gemma::chip8::instructions::Chip8CpuInstructions;
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use gemma::constants::{CHIP8FONT_2, CHIP8_VIDEO_MEMORY};
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use crate::test_utils::read_compressed_test_result;
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/// START OF THE EXECUTION TESTS
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#[test]
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fn instruction_tests() {
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// 0x0nnn Exit to System Call
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let mut x = Chip8Computer::new();
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Chip8CpuInstructions::SYS(0).execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0);
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let mut x = Chip8Computer::new();
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Chip8CpuInstructions::SYS(0xFA0).execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0xFA0);
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let mut x = Chip8Computer::new();
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Chip8CpuInstructions::SYS(0x0AF).execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0x0AF);
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// 0x1nnn Jump to Address
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let mut x = Chip8Computer::new();
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Chip8CpuInstructions::JPA(0).execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0);
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let mut x = Chip8Computer::new();
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Chip8CpuInstructions::JPA(0xABC).execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0xABC);
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// 0x6xkk Set Vx = kk
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let mut x = Chip8Computer::new();
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Chip8CpuInstructions::LDR(1, 0x12).execute(&mut x);
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assert_eq!(x.registers.peek(1), 0x12);
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let mut x = Chip8Computer::new();
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Chip8CpuInstructions::LDR(2, 0x21).execute(&mut x);
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assert_eq!(x.registers.peek(2), 0x21);
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// 0x3xkk Skip next instruction if Vx = kk.
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// The interpreter compares register Vx to kk,
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// and if they are equal, increments the program counter by 2.
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// test setup: Load value 0x84 into V1
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let mut x = Chip8Computer::new();
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x.registers.poke(0x1, 0x84);
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Chip8CpuInstructions::SEX(1, 0x48).execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0x202);
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let mut x = Chip8Computer::new();
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x.registers.poke(0x1, 0x84);
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Chip8CpuInstructions::SEX(1, 0x84).execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0x204);
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// 0x4xkk Skip next instruction if Vx != kk
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let mut x = Chip8Computer::new();
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x.registers.poke(0x01, 0x84);
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x.registers.poke(0x2, 0x84);
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// skip, compare 0x84 to 0x84
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Chip8CpuInstructions::SEY(0x1, 0x2).execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0x204);
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let mut x = Chip8Computer::new();
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x.registers.poke(0x01, 0x84);
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x.registers.poke(0x2, 0x48);
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Chip8CpuInstructions::SEY(0x01, 0x02).execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0x202);
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// 0x8xy0 Set value of Vy in Vx
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let mut x = Chip8Computer::new();
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x.registers.poke(0x01, 0x01);
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x.registers.poke(0x02, 0x02);
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Chip8CpuInstructions::LDRY(0x01, 0x02).execute(&mut x);
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assert_eq!(x.registers.peek(1), 0x02);
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// 0x8xy1 Set Vx = Vx OR Vy
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// 0b0101 0000 (0x50)
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// | 0b0000 1010 (0x0A)
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// 0b0101 1010 (0x5A)
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let mut x = Chip8Computer::new();
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x.registers.poke(0x01, 0b01010000);
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x.registers.poke(0x02, 0b00001010);
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Chip8CpuInstructions::OR(1, 2).execute(&mut x);
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assert_eq!(x.registers.peek(1), 0b01011010);
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// 0x8xy2 Set Vx = Vx AND Vy
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// 0b1111 1100 (0xFC)
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// & 0b1100 1010 (0xCA)
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// 0b1100 1000 (0xC8)
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let mut x = Chip8Computer::new();
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x.registers.poke(0x01, 0xFC);
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x.registers.poke(0x02, 0xCA);
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Chip8CpuInstructions::AND(1, 2).execute(&mut x);
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assert_eq!(x.registers.peek(1), 0xC8);
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// 0x8xy3 Set Vx = Vx XOR Vy
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// 0b1111 1100 (0xFC)
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// ^ 0b1100 1010 (0xCA)
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// 0b0011 0110 (0x36)
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let mut x = Chip8Computer::new();
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x.registers.poke(0x01, 0b11111100);
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x.registers.poke(0x02, 0b11001010);
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Chip8CpuInstructions::ORY(1, 2).execute(&mut x);
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assert_eq!(x.registers.peek(1), 0b00110110);
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// 0x8xy4 Set Vx = Vx + Vy (SET VF on Carry)
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// T1 T2: Judgement Test
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// 0x01 0xFF
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// + 0x01 0x01
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// 0x02 F0 0x00 F1
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let mut x = Chip8Computer::new();
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x.registers.poke(0x0f, 00);
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x.registers.poke(0x01, 0x01);
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x.registers.poke(0x02, 0x01);
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Chip8CpuInstructions::ADDR(0x01, 0x02).execute(&mut x);
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assert_eq!(x.registers.peek(0xf), 0x00);
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assert_eq!(x.registers.peek(0x01), 0x02);
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let mut x = Chip8Computer::new();
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x.registers.poke(0x0f, 0x00);
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x.registers.poke(0x01, 0xff);
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x.registers.poke(0x02, 0x01);
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Chip8CpuInstructions::ADDR(1, 2).execute(&mut x);
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assert_eq!(x.registers.peek(0xf), 1);
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assert_eq!(x.registers.peek(1), 0);
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/*
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Set Vx = Vx SHR 1.
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If the least-significant bit of Vx is 1, then VF is set to 1, otherwise 0. Then Vx is divided by 2.
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*/
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let mut x = Chip8Computer::new();
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x.registers.poke(0x0f, 0x00);
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x.registers.poke(0x01, 0b00001000);
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x.registers.poke(0x02, 0b00000000);
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Chip8CpuInstructions::SHR(0x1, 0x2).execute(&mut x); // 0b0000 0010 (0x02) (Not Set)
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assert_eq!(x.registers.peek(1), 0b00000100);
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assert_eq!(x.registers.peek(0xf), 0);
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x = Chip8Computer::new();
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x.registers.poke(0x0f, 0x00);
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x.registers.poke(0x01, 0b00001001);
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Chip8CpuInstructions::SHR(0x1, 0x2).execute(&mut x);
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assert_eq!(x.registers.peek(1), 0b00000100);
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assert_eq!(x.registers.peek(0xf), 1);
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let mut x = Chip8Computer::new();
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Chip8CpuInstructions::LDIA(0x123).execute(&mut x);
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assert_eq!(x.registers.peek_i(), 0x123);
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assert_eq!(x.registers.peek_pc(), 0x202);
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}
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#[test]
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fn jp_v0addr_test() {
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let mut x = Chip8Computer::new();
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/// jump to I + nnn
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x.registers.poke(0x0, 0xff);
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Chip8CpuInstructions::JPI(0x100).execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0x1FF);
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}
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#[test]
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fn cls_test() {
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let mut x = Chip8Computer::new();
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Chip8CpuInstructions::CLS.execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0x202);
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for i in 0..CHIP8_VIDEO_MEMORY {
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assert!(!x.video_memory.peek(i as u16));
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}
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// draw some thing to the video memory
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x.video_memory.poke(0x01, true);
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x.video_memory.poke(0x03, true);
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x.video_memory.poke(0x05, true);
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Chip8CpuInstructions::CLS.execute(&mut x);
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for i in 0..CHIP8_VIDEO_MEMORY {
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assert!(!x.video_memory.peek(i as u16));
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}
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}
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#[test]
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fn skip_next_instruction_ne_text() {
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let mut x = Chip8Computer::new();
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x.registers.poke(0x1, 0xf0);
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Chip8CpuInstructions::SNEB(0x1, 0x0f).execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0x204);
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let mut x = Chip8Computer::new();
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x.registers.poke(0x1, 0xf0);
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Chip8CpuInstructions::SNEB(0x1, 0xf0).execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0x202);
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}
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#[test]
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fn addivx_test() {
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let mut x = Chip8Computer::new();
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x.registers.poke_i(0xabc);
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x.registers.poke(0x0, 0x10);
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Chip8CpuInstructions::ADDI(0x0).execute(&mut x);
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assert_eq!(x.registers.peek_i(), 0xacc);
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}
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#[test]
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fn ldstvt_test() {
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let mut x = Chip8Computer::new();
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x.registers.poke(0x1, 0xf0);
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Chip8CpuInstructions::LDIS(0x01).execute(&mut x);
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assert_eq!(x.sound_timer.current(), 0xf0);
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x.sound_timer.tick();
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x.sound_timer.tick();
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x.sound_timer.tick();
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assert_eq!(x.sound_timer.current(), 0xed);
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}
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#[test]
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fn rnd_vx_byte_text() {
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let mut x = Chip8Computer::new();
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Chip8CpuInstructions::RND(0x1, 0x0f).execute(&mut x);
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let new_value = x.registers.peek(0x1);
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assert!(new_value < 0x10);
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}
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#[test]
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fn add_vx_byte_test() {
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let mut x = Chip8Computer::new();
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// set a value in the register
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x.registers.poke(0x01, 0xab);
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// add 0x10 to register
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Chip8CpuInstructions::ADD(0x1, 0x10).execute(&mut x);
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assert_eq!(x.registers.peek(1), 0xbb);
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}
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#[test]
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fn sub_vx_vy_test() {
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let mut x = Chip8Computer::new();
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// load values in 2 registers
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x.registers.poke(0x1, 0x10);
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x.registers.poke(0x2, 0x08);
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Chip8CpuInstructions::SUB(0x1, 0x02).execute(&mut x);
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assert_eq!(x.registers.peek(0xf), 1);
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assert_eq!(x.registers.peek(0x1), 0x8);
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assert_eq!(x.registers.peek_pc(), 0x202);
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}
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#[test]
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fn sne_vx_vy_test() {
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let mut x = Chip8Computer::new();
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x.registers.poke(0x1, 0x10);
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x.registers.poke(0x2, 0x10);
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Chip8CpuInstructions::SNEY(0x1, 0x2).execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0x202);
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let mut x = Chip8Computer::new();
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x.registers.poke(0x1, 0x10);
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x.registers.poke(0x2, 0x00);
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Chip8CpuInstructions::SNEY(0x01, 0x02).execute(&mut x);
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assert_eq!(x.registers.peek_pc(), 0x204)
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}
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#[test]
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fn ld_dt_vx_test() {
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let mut x = Chip8Computer::new();
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x.registers.poke(0x1, 0x10);
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Chip8CpuInstructions::LDD(0x1).execute(&mut x);
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assert_eq!(x.delay_timer.current(), 0x10);
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for _ in 0..0x20 {
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x.delay_timer.tick();
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}
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assert_eq!(x.delay_timer.current(), 0);
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}
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#[test]
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fn ld_vx_dt_test() {
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let mut x = Chip8Computer::new();
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x.registers.poke(0x1, 0xf0);
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Chip8CpuInstructions::LDD(0x1).execute(&mut x);
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x.delay_timer.tick();
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x.delay_timer.tick();
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x.delay_timer.tick();
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assert_eq!(x.delay_timer.current(), 0xed);
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}
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#[test]
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fn subn_vx_vy_test() {
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// This instruction subtracts the value in
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// register Vx from the value in register Vy and stores the result in register Vx.
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// The subtraction is performed as follows: Vx = Vy - Vx. If Vy is less than Vx,
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// the result will wrap around (due to the 8-bit nature of the registers).
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// The carry flag (VF) is set to 1 if there is no borrow (i.e., Vy is greater
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// than or equal to Vx), and it is set to 0 if there is a borrow.
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let mut x = Chip8Computer::new();
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x.registers.poke(0x1, 0xa0);
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x.registers.poke(0x2, 0xab);
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Chip8CpuInstructions::SUBC(0x1, 0x2).execute(&mut x);
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// expect the result to be 0x0b
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assert_eq!(x.registers.peek(0x1), 0x0b);
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// expect the vf register to be set to 1 as there was overflow
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assert_eq!(x.registers.peek(0xf), 0x1);
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let mut x = Chip8Computer::new();
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x.registers.poke(0x01, 0xab);
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x.registers.poke(0x02, 0xa0);
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Chip8CpuInstructions::SUBC(0x1, 0x2).execute(&mut x);
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// expect the result to be 11110101, -0xB, -11, 245, 0xF5
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assert_eq!(x.registers.peek(0x1), 0xf5);
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assert_eq!(x.registers.peek(0xf), 0x0);
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// 8xyE - SHL Vx {, Vy}
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// Set Vx = Vx SHL 1.
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//
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// If the most-significant bit of Vx is 1, then VF is set to 1, otherwise to 0. Then Vx is multiplied by 2.
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let mut x = Chip8Computer::new();
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x.registers.poke(0x1, 0b00100000);
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Chip8CpuInstructions::SHL(0x1, 0x1).execute(&mut x);
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assert_eq!(x.registers.peek(0x1), 0b01000000);
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assert_eq!(x.registers.peek(0xf), 0x0);
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let mut x = Chip8Computer::new();
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x.registers.poke(0x1, 0b10101010);
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Chip8CpuInstructions::SHL(0x1, 0x1).execute(&mut x);
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assert_eq!(x.registers.peek(0x1), 0b01010100);
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assert_eq!(x.registers.peek(0xf), 0x1);
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// Fx29 - LD F, Vx
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// Set I = location of sprite for digit Vx.
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//
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// The value of I is set to the location for the hexadecimal sprite corresponding to the value of Vx. See section 2.4, Display, for more information on the Chip-8 hexadecimal font.
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let mut x = Chip8Computer::new();
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// target_sprite = 2
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// target_offset = 0x5
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x.registers.poke(0x1, 0x2);
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Chip8CpuInstructions::LDFX(0x1).execute(&mut x);
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assert_eq!(x.registers.peek_i(), 10);
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let mut x = Chip8Computer::new();
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x.registers.poke(0x01, 0x06);
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Chip8CpuInstructions::LDFX(0x1).execute(&mut x);
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assert_eq!(x.registers.peek_i(), 30);
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// Fx33 - LD B, Vx
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// Store BCD representation of Vx in memory locations I, I+1, and I+2.
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//
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// The interpreter takes the decimal value of Vx, and places the hundreds digit
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// in memory at location in I, the tens digit at location I+1,
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// and the ones digit at location I+2.
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let mut x = Chip8Computer::new();
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// load the value 123 (0x7b)
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x.registers.poke(0x1, 0x7b);
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x.registers.poke_i(0x500);
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Chip8CpuInstructions::BCD(0x1).execute(&mut x);
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assert_eq!(x.memory.peek(0x500), 0x1);
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assert_eq!(x.memory.peek(0x501), 0x2);
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assert_eq!(x.memory.peek(0x502), 0x3);
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// Store registers V0 through Vx in memory starting at location I.
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//
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// The interpreter copies the values of registers V0 through Vx into memory,
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// starting at the address in I.
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let mut x = Chip8Computer::new();
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// Load Registers.
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let to_load = [0xab, 0xba, 0xca, 0xca, 0xbe, 0xef];
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for (idx, val) in to_load.iter().enumerate() {
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x.registers.poke(idx as u8, *val);
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}
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x.registers.poke_i(0x500);
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Chip8CpuInstructions::LDIX(to_load.len() as u8).execute(&mut x);
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// Verify the values are in memory from 0x500 to 0x507
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for (idx, value) in to_load.iter().enumerate() {
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assert_eq!(x.memory.peek(0x500 + idx as u16), *value);
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}
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// Read registers V0 through Vx from memory starting at location I.
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//
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// The interpreter reads values from memory starting at location I into registers V0 through Vx.
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let mut x = Chip8Computer::new();
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let base_offset = 0x500;
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let to_load = [0xab, 0xba, 0xca, 0xca, 0xbe, 0xef];
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// start by setting values in memory
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for (idx, memory) in to_load.iter().enumerate() {
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let target_address = base_offset + idx;
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let target_value = *memory;
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x.memory.poke(target_address as u16, target_value);
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}
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// where to load from
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x.registers.poke_i(0x500);
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// how much to load
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x.registers.poke(0x6, to_load.len() as u8);
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// then copying them values memory to registers
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Chip8CpuInstructions::LDRI(0x6).execute(&mut x);
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// now check that we have the right values in our registers
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for (idx, value) in to_load.iter().enumerate() {
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assert_eq!(x.registers.peek(idx as u8), *value);
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}
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// ExA1 - SKNP Vx
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// Skip next instruction if key with the value of Vx is not pressed.
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//
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// Checks the keyboard,
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// and if the key corresponding to the value of Vx is currently in the up position,
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// PC is increased by 2.
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let mut x = Chip8Computer::new();
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x.keypad.push_key(0x5);
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x.registers.poke(0x1, 0x5);
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Chip8CpuInstructions::SKNP(0x1).execute(&mut x);
|
|
assert_eq!(x.registers.peek_pc(), 0x202);
|
|
x.keypad.release_key(0x5);
|
|
Chip8CpuInstructions::SKNP(0x1).execute(&mut x);
|
|
assert_eq!(x.registers.peek_pc(), 0x206);
|
|
|
|
// Ex9E - SKP Vx
|
|
// Skip next instruction if key with the value of Vx is pressed.
|
|
//
|
|
// Checks the keyboard, and if the key corresponding to the value of Vx is currently in the down position, PC is increased by 2.
|
|
let mut x = Chip8Computer::new();
|
|
x.keypad.push_key(0x5);
|
|
x.registers.poke(0x1, 0x5);
|
|
Chip8CpuInstructions::SKP(0x1).execute(&mut x);
|
|
assert_eq!(x.registers.peek_pc(), 0x204);
|
|
|
|
x.keypad.release_key(0x5);
|
|
Chip8CpuInstructions::SKP(0x1).execute(&mut x);
|
|
assert_eq!(x.registers.peek_pc(), 0x206);
|
|
}
|
|
|
|
#[test]
|
|
#[ignore]
|
|
fn draw_nibble_vx_vy_n_test_hd() {
|
|
let mut x = Chip8Computer::new();
|
|
|
|
let x_register = 0x01;
|
|
let x_offset = 0x03;
|
|
let y_register = 0x02;
|
|
let y_offset = 0x04;
|
|
let char_offset = 0x100;
|
|
x.registers.poke(x_register, x_offset);
|
|
x.registers.poke(y_register, y_offset);
|
|
x.video_memory.set_highres();
|
|
x.registers.poke_i(char_offset);
|
|
Chip8CpuInstructions::DRW(x_register, y_register, 0).execute(&mut x);
|
|
|
|
println!("[[{}]]", x.video_memory.format_as_string());
|
|
|
|
assert_eq!(read_compressed_test_result(""), x.video_memory.format_as_string());
|
|
}
|
|
|
|
#[test]
|
|
fn draw_nibble_vx_vy_n_test_sd() {
|
|
let mut x = Chip8Computer::new();
|
|
let x_register = 0x1;
|
|
let y_register = 0x2;
|
|
let x_offset = 1;
|
|
let y_offset = 2;
|
|
let char_offset = 0x0A;
|
|
|
|
// now lets set the X and Y to 1,2
|
|
x.registers.poke(x_register, x_offset);
|
|
x.registers.poke(y_register, y_offset);
|
|
x.registers.poke_i(char_offset);
|
|
// we are using 5 rows.
|
|
Chip8CpuInstructions::DRW(x_register, y_register, 5).execute(&mut x);
|
|
|
|
// now check that video memory has the values at
|
|
// 1,2->1,9
|
|
// 2,2->2,9
|
|
// 3,2->3,9
|
|
// 4,2->4,9
|
|
// 5,2->5,9
|
|
// let byte_to_check = CHIP8FONT_0[0];
|
|
for row_in_sprite in 0..5 {
|
|
let row_data = CHIP8FONT_2[row_in_sprite];
|
|
for bit_in_byte in 0..8 {
|
|
let data_offset =
|
|
(x_offset as u16 + row_in_sprite as u16) * 64 + (bit_in_byte + y_offset) as u16;
|
|
let real_bit_in_byte = 7 - bit_in_byte;
|
|
let shifted_one = 0x01 << real_bit_in_byte;
|
|
let one_shift_set = (shifted_one & row_data) > 0;
|
|
debug!("ROWDATA = \t\t[{row_data:08b}]\tBIT IN BYTE = \t[{bit_in_byte}]\tONE_SHIFT_SET = [{one_shift_set}]\tSHIFTED ONE = [{shifted_one:08b}]");
|
|
debug!("DATA_OFFSET FOR SOURCE DATA {}x{} is {} / offset by {}x{} and should be {} working with byte {:08b}",
|
|
bit_in_byte, row_in_sprite, data_offset, x_offset, y_offset, one_shift_set, row_data);
|
|
}
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn sub_test() {
|
|
// 2nnn
|
|
// Call a subroutine at 2nnn
|
|
let mut x = Chip8Computer::new();
|
|
Chip8CpuInstructions::CALL(0x124).execute(&mut x);
|
|
assert_eq!(x.registers.peek_pc(), 0x124);
|
|
assert_eq!(x.stack.depth(), 1);
|
|
Chip8CpuInstructions::CALL(0x564).execute(&mut x);
|
|
assert_eq!(x.registers.peek_pc(), 0x564);
|
|
assert_eq!(x.stack.depth(), 2);
|
|
|
|
// SETUP
|
|
// Return from a subroutine.
|
|
let mut x = Chip8Computer::new();
|
|
x.stack.push(&0x132);
|
|
x.stack.push(&0xabc);
|
|
// EXECUTE
|
|
Chip8CpuInstructions::RET.execute(&mut x);
|
|
// VERIFY
|
|
assert_eq!(x.registers.peek_pc(), 0xabc);
|
|
assert_eq!(x.stack.depth(), 1);
|
|
// EXECUTE
|
|
Chip8CpuInstructions::RET.execute(&mut x);
|
|
// VERIFY
|
|
assert_eq!(x.registers.peek_pc(), 0x132);
|
|
assert_eq!(x.stack.depth(), 0);
|
|
}
|
|
|
|
#[test]
|
|
fn ldvxk_test() {
|
|
// SETUP
|
|
let mut x = Chip8Computer::new();
|
|
x.registers.poke(0x01, 0x01);
|
|
Chip8CpuInstructions::LDRK(0x1).execute(&mut x);
|
|
assert!(matches!(
|
|
x.state,
|
|
gemma::chip8::cpu_states::Chip8CpuStates::WaitingForKey
|
|
));
|
|
}
|
|
|
|
#[test]
|
|
fn series8xy4_corex_tests() {
|
|
/// 8xy4
|
|
/// Set Vx = Vx + Vy
|
|
/// Set VF=1 if Carry
|
|
///
|
|
// 1 + 1
|
|
let mut x = Chip8Computer::new();
|
|
x.registers.poke(0x01, 0x01);
|
|
x.registers.poke(0x02, 0x01);
|
|
Chip8CpuInstructions::ADDR(0x01, 0x02).execute(&mut x);
|
|
assert_eq!(x.registers.peek(0x01), 0x02);
|
|
assert_eq!(x.registers.peek(0x0f), 0x00);
|
|
|
|
// 255+1
|
|
let mut x = Chip8Computer::new();
|
|
x.registers.poke(0x01, 0xff);
|
|
x.registers.poke(0x02, 0x01);
|
|
Chip8CpuInstructions::ADDR(0x01, 0x02).execute(&mut x);
|
|
assert_eq!(x.registers.peek(0x01), 0x00);
|
|
assert_eq!(x.registers.peek(0x0f), 0x01);
|
|
|
|
// 128+192
|
|
let mut x = Chip8Computer::new();
|
|
x.registers.poke(0x01, 128);
|
|
x.registers.poke(0x02, 192);
|
|
Chip8CpuInstructions::ADDR(0x01, 0x02).execute(&mut x);
|
|
assert_eq!(x.registers.peek(0x01), 64);
|
|
assert_eq!(x.registers.peek(0x0f), 1);
|
|
|
|
// 8xy6 - SHR Vx {, Vy}
|
|
// Set Vx = Vx SHR 1.
|
|
//
|
|
// If the least-significant bit of Vx is 1, then VF is set to 1,
|
|
// otherwise 0. Then Vx is divided by 2.
|
|
let mut x = Chip8Computer::new();
|
|
// 0b10101010 -> 0b01010101
|
|
x.registers.poke(0x01, 0b10101010);
|
|
x.registers.poke(0x0f, 0x0);
|
|
|
|
Chip8CpuInstructions::SHL(0x01, 0x00).execute(&mut x);
|
|
assert_eq!(x.registers.peek(0x01), 0b01010100);
|
|
assert_eq!(x.registers.peek(0x0f), 1);
|
|
|
|
Chip8CpuInstructions::SHL(0x01, 0x00).execute(&mut x);
|
|
assert_eq!(x.registers.peek(0x01), 0b10101000);
|
|
assert_eq!(x.registers.peek(0x0f), 0x00);
|
|
|
|
Chip8CpuInstructions::SHL(0x01, 0x00).execute(&mut x);
|
|
assert_eq!(x.registers.peek(0x01), 0b01010000);
|
|
assert_eq!(x.registers.peek(0x0f), 0x01);
|
|
|
|
Chip8CpuInstructions::SHL(0x01, 0x00).execute(&mut x);
|
|
assert_eq!(x.registers.peek(0x01), 0b10100000);
|
|
assert_eq!(x.registers.peek(0x0f), 0x00);
|
|
|
|
Chip8CpuInstructions::SHL(0x01, 0x00).execute(&mut x);
|
|
assert_eq!(x.registers.peek(0x01), 0b01000000);
|
|
assert_eq!(x.registers.peek(0x0f), 0x01);
|
|
}
|
|
|
|
#[test]
|
|
fn random_produces_different_numbers() {
|
|
let mut x = Chip8Computer::new();
|
|
x.registers.poke(0x01, 0x00);
|
|
let first_number = Chip8CpuInstructions::RND(0x01, 0xff)
|
|
.execute(&mut x)
|
|
.registers
|
|
.peek(0x01);
|
|
let second_number = Chip8CpuInstructions::RND(0x01, 0xff)
|
|
.execute(&mut x)
|
|
.registers
|
|
.peek(0x01);
|
|
assert_ne!(first_number, second_number);
|
|
}
|
|
|