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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System;
using System.IO;
namespace Microsoft.TestCommon
{
//// TODO RONCAIN using System.Runtime.Serialization.Json;
/// <summary>
/// MSTest utility for testing code operating against a stream.
/// </summary>
public class StreamAssert
{
private static StreamAssert singleton = new StreamAssert();
public static StreamAssert Singleton { get { return singleton; } }
/// <summary>
/// Creates a <see cref="MemoryStream"/>, invokes <paramref name="codeThatWrites"/> to write to it,
/// rewinds the stream to the beginning and invokes <paramref name="codeThatReads"/>.
/// </summary>
/// <param name="codeThatWrites">Code to write to the stream. It cannot be <c>null</c>.</param>
/// <param name="codeThatReads">Code that reads from the stream. It cannot be <c>null</c>.</param>
public void WriteAndRead(Action<MemoryStream> codeThatWrites, Action<Stream> codeThatReads)
{
if (codeThatWrites == null)
{
throw new ArgumentNullException("codeThatWrites");
}
if (codeThatReads == null)
{
throw new ArgumentNullException("codeThatReads");
}
using (MemoryStream stream = new MemoryStream())
{
codeThatWrites(stream);
stream.Flush();
stream.Seek(0L, SeekOrigin.Begin);
codeThatReads(stream);
}
}
/// <summary>
/// Creates a <see cref="Stream"/>, invokes <paramref name="codeThatWrites"/> to write to it,
/// rewinds the stream to the beginning and invokes <paramref name="codeThatReads"/> to obtain
/// the result to return from this method.
/// </summary>
/// <param name="codeThatWrites">Code to write to the stream. It cannot be <c>null</c>.</param>
/// <param name="codeThatReads">Code that reads from the stream and returns the result. It cannot be <c>null</c>.</param>
/// <returns>The value returned from <paramref name="codeThatReads"/>.</returns>
public static object WriteAndReadResult(Action<Stream> codeThatWrites, Func<Stream, object> codeThatReads)
{
if (codeThatWrites == null)
{
throw new ArgumentNullException("codeThatWrites");
}
if (codeThatReads == null)
{
throw new ArgumentNullException("codeThatReads");
}
object result = null;
using (MemoryStream stream = new MemoryStream())
{
codeThatWrites(stream);
stream.Flush();
stream.Seek(0L, SeekOrigin.Begin);
result = codeThatReads(stream);
}
return result;
}
/// <summary>
/// Creates a <see cref="Stream"/>, invokes <paramref name="codeThatWrites"/> to write to it,
/// rewinds the stream to the beginning and invokes <paramref name="codeThatReads"/> to obtain
/// the result to return from this method.
/// </summary>
/// <typeparam name="T">The type of the result expected.</typeparam>
/// <param name="codeThatWrites">Code to write to the stream. It cannot be <c>null</c>.</param>
/// <param name="codeThatReads">Code that reads from the stream and returns the result. It cannot be <c>null</c>.</param>
/// <returns>The value returned from <paramref name="codeThatReads"/>.</returns>
public T WriteAndReadResult<T>(Action<Stream> codeThatWrites, Func<Stream, object> codeThatReads)
{
return (T)WriteAndReadResult(codeThatWrites, codeThatReads);
}
}
}
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