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package readers
import (
"io"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestPatternReader(t *testing.T) {
b2 := make([]byte, 1)
r := NewPatternReader(0)
b, err := io.ReadAll(r)
require.NoError(t, err)
assert.Equal(t, []byte{}, b)
n, err := r.Read(b2)
require.Equal(t, io.EOF, err)
require.Equal(t, 0, n)
r = NewPatternReader(10)
b, err = io.ReadAll(r)
require.NoError(t, err)
assert.Equal(t, []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, b)
n, err = r.Read(b2)
require.Equal(t, io.EOF, err)
require.Equal(t, 0, n)
}
func TestPatternReaderSeek(t *testing.T) {
r := NewPatternReader(1024)
b, err := io.ReadAll(r)
require.NoError(t, err)
for i := range b {
assert.Equal(t, byte(i%251), b[i])
}
n, err := r.Seek(1, io.SeekStart)
require.NoError(t, err)
assert.Equal(t, int64(1), n)
// pos 1
b2 := make([]byte, 10)
nn, err := r.Read(b2)
require.NoError(t, err)
assert.Equal(t, 10, nn)
assert.Equal(t, b[1:11], b2)
// pos 11
n, err = r.Seek(9, io.SeekCurrent)
require.NoError(t, err)
assert.Equal(t, int64(20), n)
// pos 20
nn, err = r.Read(b2)
require.NoError(t, err)
assert.Equal(t, 10, nn)
assert.Equal(t, b[20:30], b2)
n, err = r.Seek(-24, io.SeekEnd)
require.NoError(t, err)
assert.Equal(t, int64(1000), n)
// pos 1000
nn, err = r.Read(b2)
require.NoError(t, err)
assert.Equal(t, 10, nn)
assert.Equal(t, b[1000:1010], b2)
// Now test errors
n, err = r.Seek(1, 400)
require.Error(t, err)
assert.Contains(t, err.Error(), "invalid whence")
assert.Equal(t, int64(0), n)
n, err = r.Seek(-1, io.SeekStart)
require.Error(t, err)
assert.Contains(t, err.Error(), "negative position")
assert.Equal(t, int64(0), n)
}
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