了解MSTest TestContext [英] Understanding the MSTest TestContext

问题描述

使用MSTest，我需要从[TestInitialize]方法中获取当前测试的名称.您可以从TestContext.TestName属性中获取.

Using MSTest, I needed to obtain the name of the current test from within the [TestInitialize] method. You can get this from the TestContext.TestName property.

我发现传递给[ClassInitialize]方法的静态TestContext与声明为公共属性(并由测试运行程序设置)的静态TestContext在行为上存在意外的差异.

I found an unexpected difference in behaviour between a static TestContext that is passed in to the [ClassInitialize] method and one that is declared as a public property (and gets set by the test runner).

考虑以下代码:

using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace TestContext.Tests
{
    [TestClass]
    public class UnitTest1
    {
        public TestContext TestContext { get; set; }

        private static TestContext _testContext;

        [ClassInitialize]
        public static void SetupTests(TestContext testContext)
        {
            _testContext = testContext;
        }

        [TestInitialize]
        public void SetupTest()
        {
            Console.WriteLine(
                "TestContext.TestName='{0}'  static _testContext.TestName='{1}'",
                TestContext.TestName,
                _testContext.TestName);
        }

        [TestMethod] public void TestMethod1() { Assert.IsTrue(true); }

        [TestMethod] public void TestMethod2() { Assert.IsTrue(true); }

        [TestMethod] public void TestMethod3() { Assert.IsTrue(true); }
    }
}

这将导致输出以下内容(从VS2013中的Resharper测试运行程序输出中复制粘贴):

This causes the following to be output (copy-pasted from the Resharper test runner output in VS2013):

TestContext.TestName='TestMethod1'  static _testContext.TestName='TestMethod1'
TestContext.TestName='TestMethod2'  static _testContext.TestName='TestMethod1'
TestContext.TestName='TestMethod3'  static _testContext.TestName='TestMethod1'

我以前曾假设TestContext的两个实例是等效的，但显然它们不是.

I had previously assumed that the two instances of TestContext would be equivalent, but clearly they're not.

• public TestContext属性的行为符合我的预期
• 传递给[ClassInitialize]方法的private static TestContext值没有.由于TestContext具有与当前正在运行的测试有关的属性，因此此实现似乎会误导和破坏

• The public TestContext property behaves as I expect
• The private static TestContext value that gets passed to the [ClassInitialize] method does not. Since TestContext has properties that relate to the currently running test, this implementation seems misleading and broken

在任何情况下，您实际上是否更喜欢使用传递给[ClassInitialize]方法的TestContext，还是最好将其忽略并且永远不要使用?

Is there any scenario where you would actually prefer to use the TestContext passed to the [ClassInitialize] method, or it is best ignored and never used?

推荐答案

由于仅在开头调用[ClassInitialize]，因此测试名称为TestMethod1.在第一次测试运行后，这已经过时了.

As [ClassInitialize] is only called at the beginning, the test name is TestMethod1. This is stale after the first test run.

TestContext为每种方法设置，因此具有当前的测试名称.

TestContext is set for every method, and thus has the current test name.

是的，这有点愚蠢.

这篇关于了解MSTest TestContext的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！