12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788 |
- 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)
- }
|