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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.IO;
using System.Text;
using System.Threading;
using System.Collections.Generic;
using Xunit;
namespace System.Diagnostics.Tests
{
public class ProcessStreamReadTests : ProcessTestBase
{
[Fact]
public void TestSyncErrorStream()
{
Process p = CreateProcess(ErrorProcessBody);
p.StartInfo.RedirectStandardError = true;
p.Start();
string expected = TestConsoleApp + " started error stream" + Environment.NewLine +
TestConsoleApp + " closed error stream" + Environment.NewLine;
Assert.Equal(expected, p.StandardError.ReadToEnd());
Assert.True(p.WaitForExit(WaitInMS));
}
[Fact]
public void TestAsyncErrorStream()
{
for (int i = 0; i < 2; ++i)
{
StringBuilder sb = new StringBuilder();
Process p = CreateProcess(ErrorProcessBody);
p.StartInfo.RedirectStandardError = true;
p.ErrorDataReceived += (s, e) =>
{
sb.Append(e.Data);
if (i == 1)
{
((Process)s).CancelErrorRead();
}
};
p.Start();
p.BeginErrorReadLine();
Assert.True(p.WaitForExit(WaitInMS));
p.WaitForExit(); // This ensures async event handlers are finished processing.
string expected = TestConsoleApp + " started error stream" + (i == 1 ? "" : TestConsoleApp + " closed error stream");
Assert.Equal(expected, sb.ToString());
}
}
private static int ErrorProcessBody()
{
Console.Error.WriteLine(TestConsoleApp + " started error stream");
Console.Error.WriteLine(TestConsoleApp + " closed error stream");
return SuccessExitCode;
}
[Fact]
public void TestSyncOutputStream()
{
Process p = CreateProcess(StreamBody);
p.StartInfo.RedirectStandardOutput = true;
p.Start();
string s = p.StandardOutput.ReadToEnd();
Assert.True(p.WaitForExit(WaitInMS));
Assert.Equal(TestConsoleApp + " started" + Environment.NewLine + TestConsoleApp + " closed" + Environment.NewLine, s);
}
[Fact]
public void TestAsyncOutputStream()
{
for (int i = 0; i < 2; ++i)
{
StringBuilder sb = new StringBuilder();
Process p = CreateProcess(StreamBody);
p.StartInfo.RedirectStandardOutput = true;
p.OutputDataReceived += (s, e) =>
{
sb.Append(e.Data);
if (i == 1)
{
((Process)s).CancelOutputRead();
}
};
p.Start();
p.BeginOutputReadLine();
Assert.True(p.WaitForExit(WaitInMS));
p.WaitForExit(); // This ensures async event handlers are finished processing.
string expected = TestConsoleApp + " started" + (i == 1 ? "" : TestConsoleApp + " closed");
Assert.Equal(expected, sb.ToString());
}
}
private static int StreamBody()
{
Console.WriteLine(TestConsoleApp + " started");
Console.WriteLine(TestConsoleApp + " closed");
return SuccessExitCode;
}
[Fact]
public void TestSyncStreams()
{
const string expected = "This string should come as output";
Process p = CreateProcess(() =>
{
Console.ReadLine();
return SuccessExitCode;
});
p.StartInfo.RedirectStandardInput = true;
p.StartInfo.RedirectStandardOutput = true;
p.OutputDataReceived += (s, e) => { Assert.Equal(expected, e.Data); };
p.Start();
using (StreamWriter writer = p.StandardInput)
{
writer.WriteLine(expected);
}
Assert.True(p.WaitForExit(WaitInMS));
}
[Fact]
public void TestAsyncHalfCharacterAtATime()
{
var receivedOutput = false;
var collectedExceptions = new List<Exception>();
Process p = CreateProcess(() =>
{
var stdout = Console.OpenStandardOutput();
var bytes = new byte[] { 97, 0 }; //Encoding.Unicode.GetBytes("a");
for (int i = 0; i != bytes.Length; ++i)
{
stdout.WriteByte(bytes[i]);
stdout.Flush();
Thread.Sleep(100);
}
return SuccessExitCode;
});
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.StandardOutputEncoding = Encoding.Unicode;
p.OutputDataReceived += (s, e) =>
{
try
{
if (!receivedOutput)
{
Assert.Equal(e.Data, "a");
}
receivedOutput = true;
}
catch (Exception ex)
{
// This ensures that the exception in event handlers does not break
// the whole unittest
collectedExceptions.Add(ex);
}
};
p.Start();
p.BeginOutputReadLine();
Assert.True(p.WaitForExit(WaitInMS));
p.WaitForExit(); // This ensures async event handlers are finished processing.
Assert.True(receivedOutput);
if (collectedExceptions.Count > 0)
{
// Re-throw collected exceptions
throw new AggregateException(collectedExceptions);
}
}
[Fact]
public void TestManyOutputLines()
{
const int ExpectedLineCount = 144;
int nonWhitespaceLinesReceived = 0;
int totalLinesReceived = 0;
Process p = CreateProcess(() =>
{
for (int i = 0; i < ExpectedLineCount; i++)
{
Console.WriteLine("This is line #" + i + ".");
}
return SuccessExitCode;
});
p.StartInfo.RedirectStandardOutput = true;
p.OutputDataReceived += (s, e) =>
{
if (!string.IsNullOrWhiteSpace(e.Data))
{
nonWhitespaceLinesReceived++;
}
totalLinesReceived++;
};
p.Start();
p.BeginOutputReadLine();
Assert.True(p.WaitForExit(WaitInMS));
p.WaitForExit(); // This ensures async event handlers are finished processing.
Assert.Equal(ExpectedLineCount, nonWhitespaceLinesReceived);
Assert.Equal(ExpectedLineCount + 1, totalLinesReceived);
}
[Fact]
public void TestStreamNegativeTests()
{
{
Process p = new Process();
Assert.Throws<InvalidOperationException>(() => p.StandardOutput);
Assert.Throws<InvalidOperationException>(() => p.StandardError);
Assert.Throws<InvalidOperationException>(() => p.BeginOutputReadLine());
Assert.Throws<InvalidOperationException>(() => p.BeginErrorReadLine());
Assert.Throws<InvalidOperationException>(() => p.CancelOutputRead());
Assert.Throws<InvalidOperationException>(() => p.CancelErrorRead());
}
{
Process p = CreateProcess(StreamBody);
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.RedirectStandardError = true;
p.OutputDataReceived += (s, e) => {};
p.ErrorDataReceived += (s, e) => {};
p.Start();
p.BeginOutputReadLine();
p.BeginErrorReadLine();
Assert.Throws<InvalidOperationException>(() => p.StandardOutput);
Assert.Throws<InvalidOperationException>(() => p.StandardError);
Assert.True(p.WaitForExit(WaitInMS));
}
{
Process p = CreateProcess(StreamBody);
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.RedirectStandardError = true;
p.OutputDataReceived += (s, e) => {};
p.ErrorDataReceived += (s, e) => {};
p.Start();
StreamReader output = p.StandardOutput;
StreamReader error = p.StandardError;
Assert.Throws<InvalidOperationException>(() => p.BeginOutputReadLine());
Assert.Throws<InvalidOperationException>(() => p.BeginErrorReadLine());
Assert.True(p.WaitForExit(WaitInMS));
}
}
}
}
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