105 lines
2.1 KiB
Go
105 lines
2.1 KiB
Go
package layer
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import (
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"bytes"
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"crypto/rand"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func testBuffer(t *testing.T) []byte {
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buf := make([]byte, 1024)
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_, err := rand.Read(buf)
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require.NoError(t, err)
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return buf
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}
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func TestOffsetWriter(t *testing.T) {
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b := testBuffer(t)
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k := 64
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d := len(b) / k
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s := int64(len(b))
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t.Run("1024 / 100 / 100 bytes success", func(t *testing.T) {
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w := new(bytes.Buffer)
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o := int64(100)
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l := int64(100)
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wt := newWriter(w, o, l)
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for i := 0; i < k; i++ {
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_, err := wt.Write(b[i*d : (i+1)*d])
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require.NoError(t, err)
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}
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require.Equal(t, o, wt.skipped)
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require.Equal(t, l, wt.written)
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require.Equal(t, b[o:o+l], w.Bytes())
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})
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t.Run("1024 / 0 / 100 bytes success", func(t *testing.T) {
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w := new(bytes.Buffer)
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o := int64(0)
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l := int64(100)
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wt := newWriter(w, o, l)
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for i := 0; i < k; i++ {
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_, err := wt.Write(b[i*d : (i+1)*d])
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require.NoError(t, err)
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}
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require.Equal(t, o, wt.skipped)
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require.Equal(t, l, wt.written)
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require.Equal(t, b[o:o+l], w.Bytes())
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})
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t.Run("1024 / 0 / 1024 bytes success", func(t *testing.T) {
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w := new(bytes.Buffer)
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o := int64(0)
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l := int64(1024)
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wt := newWriter(w, o, l)
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for i := 0; i < k; i++ {
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_, err := wt.Write(b[i*d : (i+1)*d])
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require.NoError(t, err)
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}
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require.Equal(t, o, wt.skipped)
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require.Equal(t, l, wt.written)
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require.Equal(t, b[o:o+l], w.Bytes())
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})
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t.Run("should read all data when empty length passed", func(t *testing.T) {
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w := new(bytes.Buffer)
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o := int64(0)
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l := int64(0)
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wt := newWriter(w, o, l)
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for i := 0; i < k; i++ {
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_, err := wt.Write(b[i*d : (i+1)*d])
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require.NoError(t, err)
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}
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require.Equal(t, o, wt.skipped)
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require.Equal(t, s, wt.written)
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require.Equal(t, b, w.Bytes())
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})
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t.Run("should read all data when empty length passed", func(t *testing.T) {
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w := new(bytes.Buffer)
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o := int64(0)
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l := s + 1
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wt := newWriter(w, o, l)
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for i := 0; i < k; i++ {
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_, err := wt.Write(b[i*d : (i+1)*d])
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require.NoError(t, err)
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}
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require.Equal(t, o, wt.skipped)
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require.Equal(t, s, wt.written)
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require.Equal(t, b, w.Bytes())
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})
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}
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