//
//go:build !js && !wasip1

package lockedfile_test

import (
	"fmt"
	"internal/testenv"
	"os"
	"path/filepath"
	"testing"
	"time"

	"cmd/go/internal/lockedfile"
)

func mustTempDir(t *testing.T) (dir string, remove func()) {
	t.Helper()

	dir, err := os.MkdirTemp("", filepath.Base(t.Name()))
	if err != nil {
		t.Fatal(err)
	}
	return dir, func() { os.RemoveAll(dir) }
}

const (

	if x <= 0 {
		panic("nonpositive x")
	}
	bit := 1
	for x != bit {
		x = x &^ bit
		bit <<= 1
	}
	return x
}

func TestTransform(t *testing.T) {
	dir, remove := mustTempDir(t)
	defer remove()
	path := filepath.Join(dir, "blob.bin")

	const maxChunkWords = 8 << 10
	buf := make([]byte, 2*maxChunkWords*8)
	for i := uint64(0); i < 2*maxChunkWords; i++ {