file_test.go

package editpro

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

func TestEditFilePreservesMode(t *testing.T) {
	path := filepath.Join(t.TempDir(), "input.txt")
	if err := os.WriteFile(path, []byte("old old"), 0o640); err != nil {
		t.Fatal(err)
	}
	result, err := EditFile(path, []byte("old"), []byte("new"), ReplaceOptions{ExpectedMatches: 2}, WriteOptions{})
	if err != nil {
		t.Fatal(err)
	}
	data, err := os.ReadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	info, err := os.Stat(path)
	if err != nil {
		t.Fatal(err)
	}
	if string(data) != "new new" || result.Replaced != 2 || info.Mode().Perm() != 0o640 {
		t.Fatalf("data=%q result=%#v mode=%o", data, result, info.Mode().Perm())
	}
}

func TestEditFileValidationLeavesFileUnchanged(t *testing.T) {
	path := filepath.Join(t.TempDir(), "input.txt")
	if err := os.WriteFile(path, []byte("old old"), 0o600); err != nil {
		t.Fatal(err)
	}
	_, err := EditFile(path, []byte("old"), []byte("new"), ReplaceOptions{ExpectedMatches: 1}, WriteOptions{})
	if err == nil {
		t.Fatal("expected an error")
	}
	data, readErr := os.ReadFile(path)
	if readErr != nil || string(data) != "old old" {
		t.Fatalf("file changed after validation error: %q, %v", data, readErr)
	}
}

func TestEditFileRejectsSymlink(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("symlink creation commonly requires elevated privileges")
	}
	dir := t.TempDir()
	target := filepath.Join(dir, "target")
	link := filepath.Join(dir, "link")
	if err := os.WriteFile(target, []byte("old"), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.Symlink(target, link); err != nil {
		t.Fatal(err)
	}
	_, err := EditFile(link, []byte("old"), []byte("new"), ReplaceOptions{}, WriteOptions{})
	if !errors.Is(err, ErrSymlink) {
		t.Fatalf("error = %v, want ErrSymlink", err)
	}
}