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package azblob
import (
"bytes"
chk "gopkg.in/check.v1"
)
func (s *aztestsSuite) TestBytesWriterWriteAt(c *chk.C) {
b := make([]byte, 10)
buffer := newBytesWriter(b)
count, err := buffer.WriteAt([]byte{1, 2}, 10)
c.Assert(err, chk.ErrorMatches, "Offset value is out of range")
c.Assert(count, chk.Equals, 0)
count, err = buffer.WriteAt([]byte{1, 2}, -1)
c.Assert(err, chk.ErrorMatches, "Offset value is out of range")
c.Assert(count, chk.Equals, 0)
count, err = buffer.WriteAt([]byte{1, 2}, 9)
c.Assert(err, chk.ErrorMatches, "Not enough space for all bytes")
c.Assert(count, chk.Equals, 1)
c.Assert(bytes.Compare(b, []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 1}), chk.Equals, 0)
count, err = buffer.WriteAt([]byte{1, 2}, 8)
c.Assert(err, chk.IsNil)
c.Assert(count, chk.Equals, 2)
c.Assert(bytes.Compare(b, []byte{0, 0, 0, 0, 0, 0, 0, 0, 1, 2}), chk.Equals, 0)
}
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