Package iotest implements Readers and Writers useful mainly for testing.
var ErrTimeout = errors.New("timeout") func DataErrReader(r io.Reader) io.Reader
DataErrReader changes the way errors are handled by a Reader. Normally, a Reader returns an error (typically EOF) from the first Read call after the last piece of data is read. DataErrReader wraps a Reader and changes its behavior so the final error is returned along with the final data, instead of in the first call after the final data.
func HalfReader(r io.Reader) io.Reader
HalfReader returns a Reader that implements Read by reading half as many requested bytes from r.
func NewReadLogger(prefix string, r io.Reader) io.Reader
NewReadLogger returns a reader that behaves like r except that it logs (using log.Print) each read to standard error, printing the prefix and the hexadecimal data read.
func NewWriteLogger(prefix string, w io.Writer) io.Writer
NewWriteLogger returns a writer that behaves like w except that it logs (using log.Printf) each write to standard error, printing the prefix and the hexadecimal data written.
func OneByteReader(r io.Reader) io.Reader
OneByteReader returns a Reader that implements each non-empty Read by reading one byte from r.
func TimeoutReader(r io.Reader) io.Reader
TimeoutReader returns ErrTimeout on the second read with no data. Subsequent calls to read succeed.
func TruncateWriter(w io.Writer, n int64) io.Writer
TruncateWriter returns a Writer that writes to w but stops silently after n bytes.
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https://golang.org/pkg/testing/iotest/