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stack and mem tests

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This commit is contained in:
Jeeves 2024-04-22 10:55:25 -06:00
parent b7057bfabe
commit 9155b5a686
1 changed files with 29 additions and 146 deletions
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175
src/main.zig
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@ -14,7 +14,7 @@ pub fn main() !void {
if (rom_path) |path| {
var file = try std.fs.cwd().openFile(path, .{});
defer file.close();
const rom = try file.readToEndAlloc(allocator, 0xFFFF);
const rom = try file.readToEndAlloc(allocator, 0xFF00);
defer allocator.free(rom);
const mem: [0x10000]u8 = undefined;
@ -59,7 +59,7 @@ pub const Uxn = struct {
pub fn peek(self: *Memory, comptime T: type, idx: u16) T {
return switch (T) {
u8 => self.m[idx],
u16 => self.m[idx],
u16 => @as(u16, @intCast(self.m[idx])) << 8 | self.m[idx +% 1],
else => unreachable,
};
}
@ -67,7 +67,10 @@ pub const Uxn = struct {
pub fn poke(self: *Memory, comptime T: type, idx: u16, val: T) void {
switch (T) {
u8 => self.m[idx] = val,
u16 => {},
u16 => {
self.m[idx] = @truncate(val >> 8);
self.m[idx +% 1] = @truncate(val & 0xFF);
},
else => unreachable,
}
}
@ -80,7 +83,7 @@ pub const Uxn = struct {
pub fn peek(self: *Stack, comptime T: type) T {
return switch (T) {
u8 => self.s[self.sp],
u16 => @intCast(self.s[self.sp]), // but actually do the conversion
u16 => @as(u16, @intCast(self.s[self.sp])) << 8 | self.s[self.sp +% 1],
else => unreachable,
};
}
@ -88,37 +91,22 @@ pub const Uxn = struct {
pub fn poke(self: *Stack, comptime T: type, v: T) void {
switch (T) {
u8 => self.s[self.sp] = v,
u16 => {},
u16 => {
self.s[self.sp] = @truncate(v >> 8);
self.s[self.sp +% 1] = @truncate(v & 0xFF);
},
else => unreachable,
}
}
pub fn pop(self: *Stack, comptime T: type) T {
switch (T) {
u8 => {
self.sp -%= 1;
return self.s[self.sp +% 1];
},
u16 => {
self.sp -%= 2;
return self.s[self.sp +% 1];
},
else => unreachable,
}
self.sp -%= @intCast(@divExact(@typeInfo(T).Int.bits, 8));
return self.peek(T);
}
pub fn push(self: *Stack, comptime T: type, v: T) void {
switch (T) {
u8 => {
self.sp +%= 1;
self.s[self.sp] = v;
},
u16 => {
self.sp +%= 2;
self.s[self.sp] = @truncate(v);
},
else => unreachable,
}
self.poke(T, v);
self.sp +%= @intCast(@divExact(@typeInfo(T).Int.bits, 8));
}
};
@ -612,123 +600,18 @@ pub const Uxn = struct {
}
};
test "uxnasm" {
const rom = [_]u8{
0xa0, 0x01, 0x07, 0x80, 0x10, 0x37, 0x00, 0x80, 0x12, 0x16, 0x06, 0x20, 0x00, 0x05, 0x02, 0x60,
0x00, 0x65, 0x00, 0x60, 0x00, 0x01, 0x00, 0x80, 0x20, 0x8a, 0x0c, 0x04, 0x02, 0x80, 0x20, 0x07,
0x80, 0xfb, 0x13, 0x26, 0xa0, 0x20, 0x20, 0x28, 0x20, 0x00, 0x42, 0x80, 0x20, 0x09, 0x20, 0x00,
0x1c, 0x06, 0x80, 0x5b, 0x08, 0x20, 0x00, 0x1a, 0x06, 0x80, 0x5d, 0x08, 0x20, 0x00, 0x13, 0x06,
0x80, 0x28, 0x08, 0x20, 0x00, 0x29, 0x06, 0x80, 0x29, 0x08, 0x20, 0x00, 0x22, 0x80, 0x01, 0x20,
0x00, 0x02, 0x02, 0x6c, 0x80, 0x20, 0x07, 0x80, 0xfb, 0x13, 0x26, 0xa0, 0x20, 0x20, 0x28, 0x20,
0x00, 0x0b, 0x02, 0x80, 0x00, 0xa0, 0x08, 0x6b, 0xb5, 0x21, 0x80, 0xf9, 0x33, 0x22, 0x6c, 0x80,
0x28, 0x19, 0xa0, 0x01, 0x4e, 0x15, 0x6c, 0xa0, 0x01, 0x66, 0x34, 0x21, 0x26, 0xa0, 0x04, 0x1a,
0x35, 0xa0, 0x04, 0x51, 0x35, 0xa0, 0x08, 0x6b, 0x60, 0x04, 0x6d, 0x80, 0x01, 0x60, 0x00, 0x91,
0x20, 0x00, 0x85, 0x80, 0x00, 0x60, 0x00, 0x89, 0x20, 0x00, 0x7d, 0xa0, 0x80, 0x00, 0x80, 0x62,
0x30, 0x21, 0x38, 0xa0, 0x81, 0x00, 0x94, 0x80, 0x18, 0x17, 0x21, 0xa9, 0x20, 0xff, 0xf7, 0x22,
0x22, 0xa0, 0x04, 0x1a, 0x34, 0xa0, 0x04, 0x51, 0x34, 0xa1, 0x21, 0x14, 0x20, 0x00, 0x26, 0xa0,
0x00, 0x03, 0x38, 0x94, 0x80, 0x41, 0x19, 0x80, 0x1a, 0x0b, 0x20, 0x00, 0x18, 0x26, 0xa0, 0x06,
0x5e, 0x60, 0x03, 0xd1, 0x20, 0x00, 0x0e, 0xa0, 0x06, 0x52, 0x60, 0x04, 0x3d, 0x26, 0x60, 0x04,
0x3e, 0xa0, 0x0a, 0x19, 0x17, 0x60, 0x03, 0xb1, 0x21, 0xaa, 0x20, 0xff, 0xcc, 0x22, 0x22, 0xa0,
0x06, 0x64, 0x60, 0x04, 0x25, 0x80, 0x62, 0x30, 0xa0, 0x00, 0xff, 0x39, 0x60, 0x04, 0x26, 0xa0,
0x06, 0x74, 0x60, 0x04, 0x15, 0xa0, 0x04, 0x34, 0x34, 0x60, 0x04, 0x19, 0xa0, 0x06, 0x80, 0x60,
0x04, 0x08, 0xa0, 0x06, 0x7c, 0x60, 0x04, 0x02, 0xa0, 0x80, 0x66, 0x10, 0x1d, 0x80, 0x0f, 0x17,
0x6c, 0x80, 0x67, 0x11, 0xa0, 0x01, 0x00, 0x60, 0x01, 0x24, 0x80, 0x00, 0xa0, 0x05, 0x6a, 0x15,
0xa0, 0x06, 0x5e, 0x60, 0x01, 0x94, 0xa0, 0x08, 0x6b, 0x26, 0x80, 0x64, 0x31, 0x26, 0x60, 0x00,
0x13, 0x80, 0x66, 0x10, 0x20, 0x00, 0x08, 0x60, 0x03, 0x4f, 0x21, 0x94, 0x20, 0xff, 0xea, 0x22,
0x80, 0x66, 0x10, 0x6c, 0x94, 0x80, 0x08, 0x13, 0xa0, 0x07, 0x6b, 0xa0, 0x07, 0x3b, 0x94, 0x80,
0x00, 0x09, 0x20, 0x00, 0x04, 0x23, 0x21, 0x34, 0x2c, 0xa0, 0x00, 0x03, 0x38, 0xaa, 0x20, 0xff,
0xed, 0x22, 0x22, 0x60, 0x02, 0x71, 0x20, 0x00, 0x8f, 0x60, 0x02, 0x81, 0x20, 0x00, 0x6e, 0x40,
0x00, 0x4e, 0x21, 0x60, 0x01, 0xf3, 0x40, 0x00, 0xc5, 0x21, 0x60, 0x01, 0xec, 0x80, 0x60, 0x30,
0x38, 0x40, 0x00, 0xba, 0x21, 0x40, 0x01, 0x32, 0x21, 0x60, 0x01, 0x0c, 0x40, 0x01, 0x5a, 0x80,
0x80, 0x60, 0x00, 0x9b, 0x21, 0x60, 0x02, 0x1b, 0x40, 0x00, 0x94, 0x80, 0x80, 0x60, 0x00, 0x8f,
0x21, 0x60, 0x01, 0xce, 0x03, 0x40, 0x00, 0x87, 0x80, 0xa0, 0x60, 0x00, 0x82, 0x21, 0x60, 0x01,
0xc1, 0x40, 0x00, 0x77, 0x21, 0x80, 0x20, 0x40, 0x00, 0x65, 0x21, 0x80, 0x40, 0x40, 0x00, 0x5f,
0x80, 0x60, 0x40, 0x00, 0x5a, 0x21, 0x40, 0x00, 0x1a, 0x21, 0x40, 0x00, 0x0a, 0x22, 0x40, 0x02,
0xa1, 0x6c, 0x94, 0x60, 0x00, 0x59, 0x21, 0x94, 0x20, 0xff, 0xf7, 0x22, 0x6c, 0x60, 0x02, 0x1e,
0x40, 0x00, 0x4c, 0x26, 0x60, 0x02, 0xa7, 0x03, 0x06, 0x80, 0x04, 0x08, 0x80, 0x50, 0x1f, 0x80,
0x80, 0x1d, 0x60, 0x00, 0x3a, 0x40, 0x00, 0x05, 0x26, 0x60, 0x02, 0x92, 0x03, 0x06, 0x80, 0x02,
0x09, 0x20, 0x00, 0x08, 0x02, 0x60, 0x02, 0xca, 0x03, 0x40, 0x00, 0x23, 0x80, 0x04, 0x09, 0x20,
0x00, 0x06, 0x60, 0x02, 0xbd, 0x40, 0x00, 0x13, 0x22, 0xa0, 0x06, 0x9d, 0x40, 0x00, 0x23, 0x60,
0x00, 0x0d, 0x60, 0x01, 0x4d, 0x80, 0x60, 0x30, 0x21, 0x21, 0x39, 0x04, 0x60, 0x00, 0x00, 0x06,
0x80, 0x60, 0x30, 0xa1, 0x2f, 0xa0, 0x80, 0x00, 0x38, 0x15, 0x60, 0x00, 0x31, 0x6f, 0x80, 0x60,
0x31, 0x6c, 0xa0, 0x06, 0x88, 0x60, 0x02, 0xc2, 0x60, 0x02, 0xbf, 0xa0, 0x20, 0x19, 0x17, 0x80,
0x64, 0x30, 0x60, 0x02, 0xba, 0xa0, 0x06, 0x6f, 0x60, 0x02, 0xaf, 0x80, 0x00, 0x30, 0x60, 0x02,
0xae, 0xa0, 0x2e, 0x19, 0x17, 0xa0, 0x0a, 0x19, 0x17, 0xa0, 0x01, 0x66, 0x11, 0x6c, 0x20, 0x00,
0x01, 0x6c, 0x80, 0x67, 0x10, 0x20, 0x00, 0x01, 0x6c, 0x80, 0x60, 0x30, 0x26, 0x07, 0x20, 0x00,
0x06, 0xa0, 0x06, 0xce, 0x60, 0xff, 0xbb, 0xa0, 0x80, 0x00, 0x2b, 0x20, 0x00, 0x06, 0xa0, 0x06,
0xa4, 0x60, 0xff, 0xae, 0x80, 0x62, 0x31, 0x6c, 0x26, 0x60, 0x01, 0xf2, 0xa0, 0x00, 0x30, 0x60,
0x01, 0xec, 0x38, 0xa0, 0x00, 0x30, 0x2b, 0x20, 0x00, 0x06, 0xa0, 0x06, 0xb5, 0x40, 0xff, 0x92,
0xa0, 0x00, 0x00, 0x60, 0x02, 0x45, 0xa0, 0x00, 0x30, 0x6c, 0x26, 0xc0, 0x00, 0x94, 0x80, 0x2f,
0x08, 0x20, 0x00, 0x09, 0x94, 0xcf, 0x11, 0x41, 0x21, 0x94, 0x20, 0xff, 0xf0, 0x22, 0x80, 0x00,
0x4f, 0x11, 0xa0, 0x00, 0x00, 0xa0, 0x00, 0x30, 0x60, 0x02, 0x20, 0xa0, 0x2f, 0x00, 0xa0, 0x00,
0x30, 0x60, 0x01, 0xa5, 0xa1, 0x80, 0xc9, 0x33, 0x35, 0x80, 0x67, 0x10, 0x20, 0x00, 0x02, 0x22,
0x6c, 0x60, 0x00, 0xe3, 0x20, 0x00, 0x34, 0x60, 0x00, 0xf3, 0x20, 0x00, 0x2e, 0x26, 0x60, 0x00,
0x38, 0x21, 0x1d, 0x20, 0x00, 0x2c, 0x80, 0x60, 0x30, 0xa0, 0x00, 0x00, 0xaf, 0x61, 0x61, 0x35,
0x80, 0x00, 0xef, 0x61, 0x15, 0x26, 0xef, 0x60, 0x01, 0xe1, 0x60, 0x01, 0x71, 0x6f, 0x38, 0x21,
0x80, 0xe7, 0x33, 0xa0, 0x00, 0x00, 0x21, 0x80, 0xfa, 0x33, 0x6c, 0x22, 0xa0, 0x06, 0xc7, 0x40,
0xff, 0x10, 0x22, 0xa0, 0x06, 0x93, 0x40, 0xff, 0x09, 0x80, 0x11, 0x33, 0xa0, 0x04, 0x1a, 0x34,
0xa0, 0x00, 0x00, 0xa8, 0x20, 0x00, 0x16, 0xa0, 0x00, 0x03, 0x38, 0x26, 0xa0, 0x00, 0x00, 0x60,
0x01, 0x43, 0x20, 0x00, 0x0e, 0x60, 0x01, 0x31, 0x21, 0xaa, 0x20, 0xff, 0xe6, 0x22, 0x22, 0xa0,
0xff, 0xff, 0x6c, 0xa0, 0x00, 0x03, 0x39, 0x23, 0x6c, 0x60, 0x00, 0x6b, 0x20, 0x01, 0x63, 0x40,
0x00, 0x11, 0x94, 0x80, 0x7b, 0x09, 0x20, 0x00, 0x04, 0x22, 0x60, 0x00, 0xdc, 0x80, 0x67, 0x10,
0x20, 0x00, 0x29, 0x94, 0x80, 0x26, 0x09, 0x20, 0x00, 0x04, 0x21, 0x60, 0xff, 0x0a, 0x94, 0x80,
0x2f, 0x09, 0x20, 0x00, 0x04, 0x21, 0x60, 0xfe, 0xff, 0x60, 0xff, 0x9d, 0xa1, 0xa0, 0x00, 0x00,
0x28, 0x20, 0x00, 0x09, 0xa1, 0x21, 0x94, 0x01, 0x05, 0x05, 0x15, 0x34, 0x6c, 0xa0, 0x06, 0xab,
0x40, 0xfe, 0x8f, 0x60, 0xff, 0xbc, 0x80, 0x60, 0x30, 0x21, 0x21, 0x39, 0x26, 0xa0, 0x00, 0x80,
0x38, 0x02, 0x20, 0x00, 0x02, 0x03, 0x6c, 0x80, 0x67, 0x10, 0x20, 0x00, 0x06, 0xa0, 0x06, 0xbe,
0x60, 0xfe, 0x6f, 0x22, 0x80, 0xff, 0x6c, 0x26, 0x94, 0x60, 0x00, 0xde, 0x01, 0x20, 0x00, 0x04,
0x22, 0x80, 0x00, 0x6c, 0x21, 0x94, 0x20, 0xff, 0xef, 0x22, 0x80, 0x01, 0x6c, 0x26, 0x60, 0x00,
0x0d, 0x20, 0x00, 0x07, 0x26, 0xa0, 0x07, 0x38, 0x40, 0x00, 0xb0, 0x80, 0x01, 0x6c, 0x26, 0x80,
0x0e, 0x33, 0xa0, 0x20, 0x00, 0x80, 0x00, 0x07, 0x80, 0x03, 0x1a, 0xa0, 0x06, 0xd8, 0x38, 0xa0,
0x00, 0x00, 0x60, 0x00, 0x96, 0x20, 0x00, 0x0a, 0x01, 0x8a, 0x20, 0xff, 0xe8, 0x22, 0x22, 0x80,
0x00, 0x6c, 0x03, 0x06, 0x80, 0x00, 0x08, 0x80, 0x70, 0x1f, 0x1d, 0x0f, 0xa0, 0x00, 0x03, 0x38,
0x94, 0x20, 0x00, 0x03, 0x22, 0x4f, 0x6c, 0x94, 0x80, 0x32, 0x09, 0x20, 0x00, 0x03, 0xc0, 0x20,
0x5d, 0x94, 0x80, 0x6b, 0x09, 0x20, 0x00, 0x03, 0xc0, 0x80, 0x5d, 0x94, 0x80, 0x72, 0x09, 0x20,
0x00, 0x03, 0xc0, 0x40, 0x5d, 0x21, 0x40, 0xff, 0xd7, 0x80, 0x00, 0x81, 0x80, 0xfb, 0x13, 0x06,
0xa0, 0x07, 0x6b, 0xa1, 0x80, 0xfa, 0x33, 0x15, 0x80, 0x21, 0x18, 0x80, 0x18, 0x13, 0xa0, 0x05,
0x94, 0x6c, 0x80, 0xec, 0x32, 0xa0, 0x00, 0x01, 0x39, 0x94, 0x60, 0xff, 0xeb, 0x60, 0xfe, 0x69,
0x80, 0xde, 0x33, 0x6c, 0xce, 0xbb, 0x00, 0x00, 0x21, 0x94, 0x20, 0xff, 0xfb, 0x6c, 0x26, 0x60,
0xff, 0xf7, 0x24, 0x39, 0x6c, 0x2f, 0x94, 0x20, 0x00, 0x05, 0x14, 0x54, 0x4f, 0x08, 0x6c, 0x94,
0xd4, 0x4f, 0x09, 0x20, 0xff, 0xf4, 0x21, 0x61, 0x40, 0xff, 0xeb, 0x2f, 0xd4, 0x94, 0x4f, 0x09,
0x20, 0x00, 0x02, 0x61, 0x21, 0x74, 0x34, 0x6f, 0x28, 0x6c, 0x80, 0x30, 0x19, 0x06, 0x80, 0x0a,
0x0b, 0x20, 0x00, 0x0d, 0x80, 0x27, 0x19, 0x06, 0x80, 0x10, 0x0b, 0x20, 0x00, 0x03, 0x02, 0x80,
0xff, 0x6c, 0xe0, 0x00, 0x00, 0xc0, 0x40, 0x7f, 0x94, 0x60, 0xff, 0xde, 0xc0, 0x00, 0x0f, 0x78,
0x21, 0x94, 0x20, 0xff, 0xf0, 0x22, 0x6f, 0x6c, 0x80, 0x00, 0x05, 0x05, 0x94, 0x80, 0x20, 0x0a,
0x20, 0x00, 0x01, 0x95, 0x21, 0x94, 0x20, 0xff, 0xf3, 0x15, 0x6c, 0x2f, 0x94, 0x80, 0x00, 0xef,
0x35, 0x61, 0x21, 0x94, 0x20, 0xff, 0xf5, 0x22, 0x62, 0x6c, 0x94, 0x80, 0x19, 0x17, 0x21, 0x94,
0x20, 0xff, 0xf7, 0x22, 0x6c, 0xa0, 0x27, 0x10, 0xe0, 0x00, 0xfb, 0xbb, 0xa0, 0x00, 0x0a, 0xbb,
0x3a, 0x39, 0x44, 0x88, 0x07, 0xcf, 0x08, 0x1c, 0x20, 0x00, 0x08, 0x06, 0x80, 0x30, 0x18, 0x80,
0x19, 0x17, 0x41, 0x22, 0xa0, 0x00, 0x0a, 0x3b, 0x44, 0x41, 0xcf, 0x20, 0xff, 0xdd, 0x62, 0x22,
0x22, 0x6c, 0x2d, 0x2d, 0x20, 0x55, 0x6e, 0x75, 0x73, 0x65, 0x64, 0x3a, 0x20, 0x00, 0x52, 0x45,
0x53, 0x45, 0x54, 0x00, 0x41, 0x73, 0x73, 0x65, 0x6d, 0x62, 0x6c, 0x65, 0x64, 0x20, 0x00, 0x20,
0x69, 0x6e, 0x20, 0x00, 0x20, 0x62, 0x79, 0x74, 0x65, 0x73, 0x28, 0x00, 0x29, 0x2e, 0x0a, 0x00,
0x20, 0x6c, 0x61, 0x62, 0x65, 0x6c, 0x73, 0x00, 0x21, 0x21, 0x20, 0x45, 0x72, 0x72, 0x6f, 0x72,
0x3a, 0x20, 0x00, 0x44, 0x75, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x65, 0x00, 0x4e, 0x75, 0x6d,
0x62, 0x65, 0x72, 0x00, 0x4c, 0x65, 0x6e, 0x67, 0x74, 0x68, 0x00, 0x52, 0x65, 0x66, 0x65, 0x72,
0x65, 0x6e, 0x63, 0x65, 0x00, 0x53, 0x75, 0x62, 0x6c, 0x61, 0x62, 0x65, 0x6c, 0x00, 0x44, 0x69,
0x73, 0x74, 0x61, 0x6e, 0x63, 0x65, 0x00, 0x53, 0x79, 0x6d, 0x62, 0x6f, 0x6c, 0x00, 0x5a, 0x65,
0x72, 0x6f, 0x2d, 0x70, 0x61, 0x67, 0x65, 0x00, 0x4c, 0x49, 0x54, 0x49, 0x4e, 0x43, 0x50, 0x4f,
0x50, 0x4e, 0x49, 0x50, 0x53, 0x57, 0x50, 0x52, 0x4f, 0x54, 0x44, 0x55, 0x50, 0x4f, 0x56, 0x52,
0x45, 0x51, 0x55, 0x4e, 0x45, 0x51, 0x47, 0x54, 0x48, 0x4c, 0x54, 0x48, 0x4a, 0x4d, 0x50, 0x4a,
0x43, 0x4e, 0x4a, 0x53, 0x52, 0x53, 0x54, 0x48, 0x4c, 0x44, 0x5a, 0x53, 0x54, 0x5a, 0x4c, 0x44,
0x52, 0x53, 0x54, 0x52, 0x4c, 0x44, 0x41, 0x53, 0x54, 0x41, 0x44, 0x45, 0x49, 0x44, 0x45, 0x4f,
0x41, 0x44, 0x44, 0x53, 0x55, 0x42, 0x4d, 0x55, 0x4c, 0x44, 0x49, 0x56, 0x41, 0x4e, 0x44, 0x4f,
0x52, 0x41, 0x45, 0x4f, 0x52, 0x53, 0x46, 0x54, 0x42, 0x52, 0x4b, 0x7c, 0x02, 0x82, 0x24, 0x02,
0x89, 0x40, 0x02, 0x94, 0x26, 0x02, 0x98, 0x23, 0x02, 0xd5, 0x7d, 0x02, 0xdd, 0x2c, 0x02, 0x9f,
0x5f, 0x02, 0xa4, 0x2e, 0x02, 0xab, 0x2d, 0x02, 0xb0, 0x3b, 0x02, 0xb8, 0x3d, 0x02, 0xbd, 0x3f,
0x02, 0xc4, 0x21, 0x02, 0xca, 0x22, 0x02, 0xd9, 0x7e, 0x02, 0xe1,
};
const mem: [0xFFFF]u8 = undefined;
const ws: [0xFF]u8 = undefined;
const rs: [0xFF]u8 = undefined;
var uxn = Uxn{
.mem = .{ .m = mem },
.ws = .{ .s = ws, .sp = 0 },
.rs = .{ .s = rs, .sp = 0 },
.pc = 0x100,
};
@memcpy(uxn.mem.m[0x100 .. 0x100 + rom.len], &rom);
while (true) uxn.loop();
test "memory peek/poke" {
var mem = Uxn.Memory{ .m = undefined };
mem.poke(u16, 0, 0xABCD);
mem.poke(u8, 2, 0xAA);
try std.testing.expectEqual(0xABCD, mem.peek(u16, 0));
try std.testing.expectEqual(0xAA, mem.peek(u8, 2));
}
test "stack push/pop" {
var stack = Uxn.Stack{ .s = undefined };
stack.push(u16, 0xABCD);
stack.push(u8, 0xAA);
try std.testing.expectEqual(0xAA, stack.pop(u8));
try std.testing.expectEqual(0xABCD, stack.pop(u16));
}