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