package system

import (
	"context"
	"errors"
	"os/exec"
	"testing"
)

// A user that does not exist yet is "absent", in the words the host's own runner uses
// ("getent exited 2"), not only Go's ("exit status 2"). Matched as text, the runner's wording read as
// a user database that did not answer, and the controller's account was never created.
func TestAMissingUserIsAbsentInTheRunnersWords(t *testing.T) {
	for _, words := range []string{"getent exited 2: ", "exit status 2"} {
		run := func(context.Context, string, ...string) (string, error) { return "", errors.New(words) }
		_, found, err := LookUpUser(context.Background(), run, "nobody-here")
		if err != nil || found {
			t.Errorf("%q: found %v, err %v; want absent", words, found, err)
		}
	}
	run := func(context.Context, string, ...string) (string, error) { return "", errors.New("getent exited 1: ") }
	if _, _, err := LookUpUser(context.Background(), run, "x"); err == nil {
		t.Error("a database that failed read as an answer")
	}
}

// The real command, through a real exit: getent's code for a key not found.
func TestAMissingUserIsAbsentFromTheRealGetent(t *testing.T) {
	if _, err := exec.LookPath("getent"); err != nil {
		t.Skip("no getent here")
	}
	run := func(ctx context.Context, name string, args ...string) (string, error) {
		out, err := exec.CommandContext(ctx, name, args...).Output()
		return string(out), err
	}
	_, found, err := LookUpUser(context.Background(), run, "mesh-no-such-user-0b1f")
	if err != nil || found {
		t.Errorf("found %v, err %v; want absent", found, err)
	}
}