package control

import "testing"

func TestEngineKeysAreTheSameForTheSameReplicaAndNoOther(t *testing.T) {
	// A control plane that restarts, or a second one, must compute the key a
	// running engine was started with; a key taken from one node must open
	// that replica only.
	a, b := EngineKeys([]byte("s")), EngineKeys([]byte("s"))
	if a("r1") != b("r1") {
		t.Error("the same secret gave two keys for one replica")
	}
	if a("r1") == a("r2") {
		t.Error("two replicas share a key")
	}
	if a("r1") == EngineKeys([]byte("other"))("r1") {
		t.Error("the key does not depend on the secret")
	}
}