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  <h1>Package iotest</h1>


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			<dd><code>import "testing/iotest"</code></dd>
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			<dd><a href="index.html#pkg-overview" class="overviewLink">Overview</a></dd>
			<dd><a href="index.html#pkg-index" class="indexLink">Index</a></dd>
			
			
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				<p>
Package iotest implements Readers and Writers useful mainly for testing.
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				<dd><a href="index.html#pkg-variables">Variables</a></dd>
			
			
				<dd><a href="index.html#DataErrReader">func DataErrReader(r io.Reader) io.Reader</a></dd>
			
				
				<dd><a href="index.html#HalfReader">func HalfReader(r io.Reader) io.Reader</a></dd>
			
				
				<dd><a href="index.html#NewReadLogger">func NewReadLogger(prefix string, r io.Reader) io.Reader</a></dd>
			
				
				<dd><a href="index.html#NewWriteLogger">func NewWriteLogger(prefix string, w io.Writer) io.Writer</a></dd>
			
				
				<dd><a href="index.html#OneByteReader">func OneByteReader(r io.Reader) io.Reader</a></dd>
			
				
				<dd><a href="index.html#TimeoutReader">func TimeoutReader(r io.Reader) io.Reader</a></dd>
			
				
				<dd><a href="index.html#TruncateWriter">func TruncateWriter(w io.Writer, n int64) io.Writer</a></dd>
			
			
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			<h4>Package files</h4>
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				<a href="http://localhost:6060/src/testing/iotest/logger.go">logger.go</a>
			
				<a href="http://localhost:6060/src/testing/iotest/reader.go">reader.go</a>
			
				<a href="http://localhost:6060/src/testing/iotest/writer.go">writer.go</a>
			
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			  In the call graph viewer below, each node
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			  Click a node to visit that function's source code.
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			<h2 id="pkg-variables">Variables</h2>
			
				<pre>var <span id="ErrTimeout">ErrTimeout</span> = <a href="../../errors/index.html">errors</a>.<a href="../../errors/index.html#New">New</a>(&#34;timeout&#34;)</pre>
				
			
			<h2 id="DataErrReader">func <a href="http://localhost:6060/src/testing/iotest/reader.go?s=1273:1314#L35">DataErrReader</a></h2>
			<pre>func DataErrReader(r <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Reader">Reader</a>) <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Reader">Reader</a></pre>
			<p>
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.
</p>

			
			<h2 id="HalfReader">func <a href="http://localhost:6060/src/testing/iotest/reader.go?s=719:757#L20">HalfReader</a></h2>
			<pre>func HalfReader(r <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Reader">Reader</a>) <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Reader">Reader</a></pre>
			<p>
HalfReader returns a Reader that implements Read
by reading half as many requested bytes from r.
</p>

			
			<h2 id="NewReadLogger">func <a href="http://localhost:6060/src/testing/iotest/logger.go?s=1202:1258#L42">NewReadLogger</a></h2>
			<pre>func NewReadLogger(prefix <a href="../../builtin/index.html#string">string</a>, r <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Reader">Reader</a>) <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Reader">Reader</a></pre>
			<p>
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.
</p>

			
			<h2 id="NewWriteLogger">func <a href="http://localhost:6060/src/testing/iotest/logger.go?s=659:716#L20">NewWriteLogger</a></h2>
			<pre>func NewWriteLogger(prefix <a href="../../builtin/index.html#string">string</a>, w <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Writer">Writer</a>) <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Writer">Writer</a></pre>
			<p>
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.
</p>

			
			<h2 id="OneByteReader">func <a href="http://localhost:6060/src/testing/iotest/reader.go?s=381:422#L5">OneByteReader</a></h2>
			<pre>func OneByteReader(r <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Reader">Reader</a>) <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Reader">Reader</a></pre>
			<p>
OneByteReader returns a Reader that implements
each non-empty Read by reading one byte from r.
</p>

			
			<h2 id="TimeoutReader">func <a href="http://localhost:6060/src/testing/iotest/reader.go?s=1970:2011#L65">TimeoutReader</a></h2>
			<pre>func TimeoutReader(r <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Reader">Reader</a>) <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Reader">Reader</a></pre>
			<p>
TimeoutReader returns ErrTimeout on the second read
with no data.  Subsequent calls to read succeed.
</p>

			
			<h2 id="TruncateWriter">func <a href="http://localhost:6060/src/testing/iotest/writer.go?s=278:329#L1">TruncateWriter</a></h2>
			<pre>func TruncateWriter(w <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Writer">Writer</a>, n <a href="../../builtin/index.html#int64">int64</a>) <a href="../../io/index.html">io</a>.<a href="../../io/index.html#Writer">Writer</a></pre>
			<p>
TruncateWriter returns a Writer that writes to w
but stops silently after n bytes.
</p>

			
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