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package helper
import (
"os"
"path/filepath"
"testing"
"github.com/stretchr/testify/require"
)
func createTempDir(t *testing.T) string {
t.Helper()
dir, err := os.MkdirTemp("", "fuzzing-helper")
require.NoError(t, err)
t.Cleanup(func() { os.RemoveAll(dir) })
return dir
}
func TestWriteCorpusFile(t *testing.T) {
const data = "lorem ipsum"
const expectedShaSum = "bfb7759a67daeb65410490b4d98bb9da7d1ea2ce"
dir := createTempDir(t)
require.NoError(t, WriteCorpusFile(dir, []byte(data)))
path := filepath.Join(dir, expectedShaSum)
require.FileExists(t, path)
b, err := os.ReadFile(path)
require.NoError(t, err)
require.Equal(t, data, string(b))
}
func TestWriteCorpusFileWithPrefix(t *testing.T) {
const data = "lorem ipsum"
const expectedShaSum = "523f5cab80fab0c7889dbf50dd310ab8c8879f9c"
const prefixLen = 7
dir := createTempDir(t)
require.NoError(t, WriteCorpusFileWithPrefix(dir, []byte(data), prefixLen))
path := filepath.Join(dir, expectedShaSum)
require.FileExists(t, path)
b, err := os.ReadFile(path)
require.NoError(t, err)
require.Equal(t, make([]byte, prefixLen), b[:prefixLen])
require.Equal(t, data, string(b[prefixLen:]))
}
func TestCreateDirectoryIfNotExists(t *testing.T) {
dir := createTempDir(t)
subdir := filepath.Join(dir, "corpus")
require.NoDirExists(t, subdir)
require.NoError(t, WriteCorpusFile(subdir, []byte("lorem ipsum")))
require.DirExists(t, subdir)
}
func TestNthBit(t *testing.T) {
const val = 0b10010001
require.True(t, NthBit(val, 0))
require.False(t, NthBit(val, 1))
require.False(t, NthBit(val, 2))
require.False(t, NthBit(val, 3))
require.True(t, NthBit(val, 4))
require.False(t, NthBit(val, 5))
require.False(t, NthBit(val, 6))
require.True(t, NthBit(val, 7))
}
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