package ID

import "testing"

func TestUnique(t *testing.T) {
	gen := New(0)
	ids := make(map[Type]struct{})

	start := gen.Next()
	ids[start] = struct{}{}

	for current := gen.Next(); current != start; current = gen.Next() {
		if _, ok := ids[current]; ok {
			t.Fatal("generator returned known id")
		}

		ids[current] = struct{}{}
	}

	if len(ids) == 1 {
		t.Error("generator always returns same id")
	}

	t.Log("generator returned", len(ids), "ids")
}