lotus/itests/kit/files.go

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2021-06-18 18:45:29 +00:00
package kit
import (
"bytes"
"io"
"math/rand"
"os"
"testing"
"github.com/minio/blake2b-simd"
"github.com/stretchr/testify/require"
)
// CreateRandomFile creates a random file with the provided seed and the
// provided size.
func CreateRandomFile(t *testing.T, rseed, size int) (path string) {
if size == 0 {
size = 1600
}
source := io.LimitReader(rand.New(rand.NewSource(int64(rseed))), int64(size))
file, err := os.CreateTemp(t.TempDir(), "sourcefile.dat")
require.NoError(t, err)
n, err := io.Copy(file, source)
require.NoError(t, err)
require.EqualValues(t, n, size)
return file.Name()
}
// AssertFilesEqual compares two files by blake2b hash equality and
// fails the test if unequal.
func AssertFilesEqual(t *testing.T, left, right string) {
// initialize hashes.
leftH, rightH := blake2b.New256(), blake2b.New256()
// open files.
leftF, err := os.Open(left)
require.NoError(t, err)
rightF, err := os.Open(right)
require.NoError(t, err)
// feed hash functions.
_, err = io.Copy(leftH, leftF)
require.NoError(t, err)
_, err = io.Copy(rightH, rightF)
require.NoError(t, err)
// compute digests.
leftD, rightD := leftH.Sum(nil), rightH.Sum(nil)
require.True(t, bytes.Equal(leftD, rightD))
}