package builderkeys

import "testing"

// 1886/AC1: a builder that keeps no say, or a say without the word, is a builder that does not write references; one
// instance that says it is enough, since it builds every key done without a reference again (ADR 0498 §8).
func TestTheBuilderSaysReferencesOnlyWhenAnInstanceSaysTheWord(t *testing.T) {
	cases := []struct {
		name   string
		values [][]byte
		want   bool
	}{
		{"no instance", nil, false},
		{"an instance saying nothing", [][]byte{[]byte(`{"writes":[]}`)}, false},
		{"a value not read", [][]byte{[]byte(`{not json`)}, false},
		{"another word", [][]byte{[]byte(`{"writes":["digests"]}`)}, false},
		{"one instance says it", [][]byte{[]byte(`{"writes":["digests"]}`), []byte(`{"v":1,"writes":["references"]}`)}, true},
	}
	for _, c := range cases {
		if got := saysReferences(c.values); got != c.want {
			t.Errorf("%s: says references %v, want %v", c.name, got, c.want)
		}
	}
}