package main

import (
	"encoding/json"
	"testing"
)

// A module that declares nothing to back up on this machine is not backed up before it moves, and so never held for a
// backup that cannot run (issue 1945, live on 2026-10-25: redis and searxng on ace were held: "redis declares nothing to
// back up on this machine"). What node-backup.backed-up answers decides it.
func TestAModuleWithNothingToBackUpIsNotBackedUp(t *testing.T) {
	for _, c := range []struct {
		said    string
		nothing bool
	}{
		{`[{"module":"postgres","runs":1,"paths":["/var/lib/postgres"]}]`, true},
		{`[{"module":"redis","runs":0,"paths":null,"data":[{"item":"cache"}]}]`, true},
		{`[]`, true},
		{`[{"module":"redis","runs":1,"paths":["/var/lib/redis"]}]`, false},
	} {
		nothing, ok := declaresNothingToBackUp(json.RawMessage(c.said), "redis")
		if !ok || nothing != c.nothing {
			t.Errorf("%s: nothing %v (read %v), want %v", c.said, nothing, ok, c.nothing)
		}
	}
	if _, ok := declaresNothingToBackUp(json.RawMessage(`{"error":"x"}`), "redis"); ok {
		t.Error("an answer that is not the list was read")
	}
}