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