github.com/rclone/rclone@v1.66.1-0.20240517100346-7b89735ae726/lib/readers/pattern_reader_test.go (about)

     1  package readers
     2  
     3  import (
     4  	"io"
     5  	"testing"
     6  
     7  	"github.com/stretchr/testify/assert"
     8  	"github.com/stretchr/testify/require"
     9  )
    10  
    11  func TestPatternReader(t *testing.T) {
    12  	b2 := make([]byte, 1)
    13  
    14  	r := NewPatternReader(0)
    15  	b, err := io.ReadAll(r)
    16  	require.NoError(t, err)
    17  	assert.Equal(t, []byte{}, b)
    18  	n, err := r.Read(b2)
    19  	require.Equal(t, io.EOF, err)
    20  	require.Equal(t, 0, n)
    21  
    22  	r = NewPatternReader(10)
    23  	b, err = io.ReadAll(r)
    24  	require.NoError(t, err)
    25  	assert.Equal(t, []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, b)
    26  	n, err = r.Read(b2)
    27  	require.Equal(t, io.EOF, err)
    28  	require.Equal(t, 0, n)
    29  }
    30  
    31  func TestPatternReaderSeek(t *testing.T) {
    32  	r := NewPatternReader(1024)
    33  	b, err := io.ReadAll(r)
    34  	require.NoError(t, err)
    35  
    36  	for i := range b {
    37  		assert.Equal(t, byte(i%251), b[i])
    38  	}
    39  
    40  	n, err := r.Seek(1, io.SeekStart)
    41  	require.NoError(t, err)
    42  	assert.Equal(t, int64(1), n)
    43  
    44  	// pos 1
    45  
    46  	b2 := make([]byte, 10)
    47  	nn, err := r.Read(b2)
    48  	require.NoError(t, err)
    49  	assert.Equal(t, 10, nn)
    50  	assert.Equal(t, b[1:11], b2)
    51  
    52  	// pos 11
    53  
    54  	n, err = r.Seek(9, io.SeekCurrent)
    55  	require.NoError(t, err)
    56  	assert.Equal(t, int64(20), n)
    57  
    58  	// pos 20
    59  
    60  	nn, err = r.Read(b2)
    61  	require.NoError(t, err)
    62  	assert.Equal(t, 10, nn)
    63  	assert.Equal(t, b[20:30], b2)
    64  
    65  	n, err = r.Seek(-24, io.SeekEnd)
    66  	require.NoError(t, err)
    67  	assert.Equal(t, int64(1000), n)
    68  
    69  	// pos 1000
    70  
    71  	nn, err = r.Read(b2)
    72  	require.NoError(t, err)
    73  	assert.Equal(t, 10, nn)
    74  	assert.Equal(t, b[1000:1010], b2)
    75  
    76  	// Now test errors
    77  
    78  	n, err = r.Seek(1, 400)
    79  	require.Error(t, err)
    80  	assert.Contains(t, err.Error(), "invalid whence")
    81  	assert.Equal(t, int64(0), n)
    82  
    83  	n, err = r.Seek(-1, io.SeekStart)
    84  	require.Error(t, err)
    85  	assert.Contains(t, err.Error(), "negative position")
    86  	assert.Equal(t, int64(0), n)
    87  }