//go:build !windows

package version

import (
	"errors"
	"os"
	"path/filepath"
	"testing"
)

func TestUpdateDirectoryAnchorSurvivesLockPathReplacement(t *testing.T) {
	path := filepath.Join(t.TempDir(), "manager.update.lock")
	first, err := tryAcquireUpdateLock(path)
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { _ = first.release() })

	if err := os.Rename(path, path+".replaced"); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(path, nil, 0600); err != nil {
		t.Fatal(err)
	}
	second, err := tryAcquireUpdateLock(path)
	if second != nil {
		_ = second.release()
		t.Fatal("replacement lock pathname bypassed the active transaction")
	}
	if !errors.Is(err, ErrUpdateInProgress) {
		t.Fatalf("replacement lock attempt returned %v", err)
	}
}