shouldBeSameSetAs

import std.range: iota;

auto inOrder = iota(4);
auto noOrder = [2, 3, 0, 1];
auto oops = [2, 3, 4, 5];

inOrder.shouldBeSameSetAs(noOrder);
inOrder.shouldBeSameSetAs(oops).shouldThrow!UnitTestException;

struct Struct
{
    int i;
}

[Struct(1), Struct(4)].shouldBeSameSetAs([Struct(4), Struct(1)]);