testAllocator

pub fn testAllocator(base_allocator: mem.Allocator) !void {
    var validationAllocator = mem.validationWrap(base_allocator);
    const allocator = validationAllocator.allocator();

    var slice = try allocator.alloc(*i32, 100);
    try testing.expect(slice.len == 100);
    for (slice, 0..) |*item, i| {
        item.* = try allocator.create(i32);
        item.*.* = @as(i32, @intCast(i));
    }

    slice = try allocator.realloc(slice, 20000);
    try testing.expect(slice.len == 20000);

    for (slice[0..100], 0..) |item, i| {
        try testing.expect(item.* == @as(i32, @intCast(i)));
        allocator.destroy(item);
    }

    if (allocator.resize(slice, 50)) {
        slice = slice[0..50];
        if (allocator.resize(slice, 25)) {
            slice = slice[0..25];
            try testing.expect(allocator.resize(slice, 0));
            slice = slice[0..0];
            slice = try allocator.realloc(slice, 10);
            try testing.expect(slice.len == 10);
        }
    }
    allocator.free(slice);

    // Zero-length allocation
    const empty = try allocator.alloc(u8, 0);
    allocator.free(empty);
    // Allocation with zero-sized types
    const zero_bit_ptr = try allocator.create(u0);
    zero_bit_ptr.* = 0;
    allocator.destroy(zero_bit_ptr);
    const zero_len_array = try allocator.create([0]u64);
    allocator.destroy(zero_len_array);

    const oversize = try allocator.alignedAlloc(u32, null, 5);
    try testing.expect(oversize.len >= 5);
    for (oversize) |*item| {
        item.* = 0xDEADBEEF;
    }
    allocator.free(oversize);
}