const std = @import("std");
const gpa = std.testing.allocator;
test {
var list: std.ArrayList(u8) = .empty;
defer list.deinit(gpa);
try list.append(gpa, 'H');
try list.append(gpa, 'e');
try list.append(gpa, 'l');
try list.append(gpa, 'l');
try list.append(gpa, 'o');
try list.appendSlice(gpa, " World!");
try std.testing.expectEqualStrings(list.items, "Hello World!");
}