package regression

import "testing"

func TestToSetDeduplicates(t *testing.T) {
	items := []string{"a", "b", "a", "c"}
	s := toSet(items)

	if len(s) != 3 {
		t.Fatalf("expected 3 unique entries, got %d", len(s))
	}
	for _, key := range []string{"a", "b", "c"} {
		if !s[key] {
			t.Fatalf("expected key %q in set", key)
		}
	}
}