100 lines
2.3 KiB
Go
100 lines
2.3 KiB
Go
package readers
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import (
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"bytes"
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"io"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestRepeatableReader(t *testing.T) {
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var dst []byte
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var n int
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var pos int64
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var err error
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b := []byte("Testbuffer")
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buf := bytes.NewBuffer(b)
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r := NewRepeatableReader(buf)
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dst = make([]byte, 100)
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n, err = r.Read(dst)
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assert.Nil(t, err)
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assert.Equal(t, 10, n)
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require.Equal(t, b, dst[0:10])
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// Test read EOF
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n, err = r.Read(dst)
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assert.Equal(t, io.EOF, err)
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assert.Equal(t, 0, n)
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// Test Seek Back to start
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dst = make([]byte, 10)
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pos, err = r.Seek(0, io.SeekStart)
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assert.Nil(t, err)
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require.Equal(t, 0, int(pos))
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n, err = r.Read(dst)
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assert.Nil(t, err)
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assert.Equal(t, 10, n)
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require.Equal(t, b, dst)
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// Test partial read
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buf = bytes.NewBuffer(b)
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r = NewRepeatableReader(buf)
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dst = make([]byte, 5)
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n, err = r.Read(dst)
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assert.Nil(t, err)
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assert.Equal(t, 5, n)
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require.Equal(t, b[0:5], dst)
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n, err = r.Read(dst)
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assert.Nil(t, err)
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assert.Equal(t, 5, n)
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require.Equal(t, b[5:], dst)
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// Test Seek
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buf = bytes.NewBuffer(b)
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r = NewRepeatableReader(buf)
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// Should not allow seek past cache index
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pos, err = r.Seek(5, io.SeekCurrent)
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assert.NotNil(t, err)
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assert.Equal(t, "fs.RepeatableReader.Seek: offset is unavailable", err.Error())
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assert.Equal(t, 0, int(pos))
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// Should not allow seek to negative position start
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pos, err = r.Seek(-1, io.SeekCurrent)
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assert.NotNil(t, err)
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assert.Equal(t, "fs.RepeatableReader.Seek: negative position", err.Error())
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assert.Equal(t, 0, int(pos))
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// Should not allow seek with invalid whence
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pos, err = r.Seek(0, 3)
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assert.NotNil(t, err)
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assert.Equal(t, "fs.RepeatableReader.Seek: invalid whence", err.Error())
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assert.Equal(t, 0, int(pos))
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// Should seek from index with io.SeekCurrent(1) whence
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dst = make([]byte, 5)
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_, _ = r.Read(dst)
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pos, err = r.Seek(-3, io.SeekCurrent)
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assert.Nil(t, err)
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require.Equal(t, 2, int(pos))
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pos, err = r.Seek(1, io.SeekCurrent)
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assert.Nil(t, err)
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require.Equal(t, 3, int(pos))
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// Should seek from cache end with io.SeekEnd(2) whence
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pos, err = r.Seek(-3, io.SeekEnd)
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assert.Nil(t, err)
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require.Equal(t, 2, int(pos))
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// Should read from seek position and past it
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dst = make([]byte, 5)
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n, err = io.ReadFull(r, dst)
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assert.Nil(t, err)
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assert.Equal(t, 5, n)
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assert.Equal(t, b[2:7], dst)
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}
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