从单元测试中获取发送到 Console.Out 的输出?

问题描述

我正在使用 NUnit 在 C# 中构建单元测试，我想测试主程序是否根据命令行参数实际输出正确的输出.

I am building a unit test in C# with NUnit, and I'd like to test that the main program actually outputs the right output depending on the command line arguments.

有没有办法从调用 Program.Main(...) 的 NUnit 测试方法中获取写入 Console.Out 和 Console.Error 以便我可以验证它?

Is there a way from an NUnit test method that calls Program.Main(...) to grab everything written to Console.Out and Console.Error so that I can verify against it?

推荐答案

你可以重定向 Console.In, Console.Out 和 Console.Error 到自定义 StringWriters，像这样

You can redirect Console.In, Console.Out and Console.Error to custom StringWriters, like this

[TestMethod]
public void ValidateConsoleOutput()
{
    using (StringWriter sw = new StringWriter())
    {
        Console.SetOut(sw);

        ConsoleUser cu = new ConsoleUser();
        cu.DoWork();

        string expected = string.Format("Ploeh{0}", Environment.NewLine);
        Assert.AreEqual<string>(expected, sw.ToString());
    }
}

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