const std = @import("std");
const sys = @import("system.zig");

test "load value into accumulator" {
    var system: sys.System = .{};

    const program = [_]u8{
        0x01, 0x52, // ldai 0x52
    };

    system.loadProgramRaw(&program);
    try system.step();
    try std.testing.expectEqual(0x52, system.a);
}

test "load values and check registers afterwards" {
    var system: sys.System = .{};

    const program = [_]u8{
        0x01, 0x01, // ladi 0x01
        0x0c, 0x00, 0x02, // mov a, c
        0x06, 0x02, // addr c
    };

    system.loadProgramRaw(&program);

    while (system.read(system.pc) != 0x00) {
        try system.step();
    }

    try std.testing.expectEqual(2, system.a);
    try std.testing.expectEqual(1, system.c);
}

test "load values, add values, jump" {
    var system: sys.System = .{};

    const program = [_]u8{
        0x01, 0x03, // ladi 0x03
        0x0c, 0x00, 0x02, // mov a, c
        0x0b, 0x02, // cmp c
        0x09, 0x11, 0xa9, // jz 0xa911
        0x08, 0x15, 0xa9, // jmp 0xa915
    };

    system.loadProgramRaw(&program);

    while (system.read(system.pc) != 0x00) {
        try system.step();
    }

    try std.testing.expectEqual(0x03, system.a);
    try std.testing.expectEqual(0x03, system.c);
    try std.testing.expectEqual(0xa911, system.pc);
}