//go:build darwin

package safeio

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

	"golang.org/x/sys/unix"
)

func TestWriteCanonicalExclusiveClassifiesUnlinkFailureAsIndeterminate(t *testing.T) {
	root := t.TempDir()
	stage := filepath.Join(root, "stage")
	if err := os.WriteFile(stage, []byte("candidate"), 0o600); err != nil {
		t.Fatal(err)
	}
	dir, err := unix.Open(root, unix.O_RDONLY|unix.O_DIRECTORY, 0)
	if err != nil {
		t.Fatal(err)
	}
	defer unix.Close(dir)
	fd, err := unix.Openat(dir, "stage", unix.O_RDWR, 0)
	if err != nil {
		t.Fatal(err)
	}
	file := os.NewFile(uintptr(fd), "stage")
	if file == nil {
		t.Fatal("os.NewFile returned nil")
	}
	defer file.Close()
	var staged unix.Stat_t
	if err := unix.Fstat(fd, &staged); err != nil {
		t.Fatal(err)
	}
	oldUnlink := darwinUnlinkat
	t.Cleanup(func() { darwinUnlinkat = oldUnlink })
	darwinUnlinkat = func(int, string, int) error { return errors.New("injected unlink failure") }
	if err := cleanupDarwinStage(dir, "stage", &staged, file.Close); !errors.Is(err, ErrIndeterminateFile) {
		t.Fatalf("unlink failure = %v, want ErrIndeterminateFile", err)
	}
}