C#单元测试StreamWriter参数 [英] C# Unit Test a StreamWriter parameter

问题描述

我有一堆都实现接口的类，其中一个参数是StreamWriter.

I have a bunch of classes that all implement an Interface and one of the parameters is a StreamWriter.

我需要检查StreamWriter的内容.

I need to check the contents of the StreamWriter.

我试图找到一种避免在测试服务器上写入文本文件并打开它们以检查其内容的方法.

I am trying to find a way to avoid writing text files on the test server and opening them to check the contents.

是否可以快速将StreamWriter的内容/流转换为StringBuilder变量?

Is there is a way to quickly convert the StreamWriter contents/stream to a StringBuilder variable?

推荐答案

您不能检查 StreamWriter .您可以检查其正在写入的基础流.因此，您可以在单元测试中使用 MemoryStream 并将此 StreamWriter 指向它.完成编写后，您可以从中读取内容.

You cannot check the StreamWriter. You could check the underlying stream it is writing to. So you could use a MemoryStream in your unit test and point this StreamWriter to it. Once it has finished writing you could read from it.

[TestMethod]
public void SomeMethod_Should_Write_Some_Expected_Output()
{
    // arrange
    using (var stream = new MemoryStream())
    using (var writer = new StreamWriter(stream))
    {
        // act
        sut.SomeMethod(writer);

        // assert
        string actual = Encoding.UTF8.GetString(stream.ToArray());
        Assert.AreEqual("some expected output", actual);
    }
}

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