blocks|key|1386847|text|这是测试套件的标准行为:在每次测试之前和之后进行设置和拆卸。其哲学是测试不应该相互依赖。如果您想要另一种行为，您可能应该使用在每次测试之间持久存在的静态对象。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1386848|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

this is rather standard behaviour for test suites: setup and teardown before and after each test. The philosophy is that tests should not depend on each other. If you want another behaviour, you should probably use static objects that persist between each test.

blocks|key|1171600|text|在每次测试之前和之后都会运行TestInitialize和TestCleanup，这是为了确保不耦合任何测试。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1171601|如果要在所有测试之前和之后运行方法，请使用ClassInitialize和ClassCleanup属性修饰相关方法。|1171602|Visual+Studio中自动生成的测试文件中的相关信息：|1171603|您可以在编写测试时使用以下附加属性：|1171604|//+Use+ClassInitialize+to+run+code+before+running+the+first+test+in+the+class
[ClassInitialize()]
public+static+void+MyClassInitialize(TestContext+testContext)+{+}

//+Use+ClassCleanup+to+run+code+after+all+tests+in+a+class+have+run
[ClassCleanup()]
public+static+void+MyClassCleanup()+{+}

//+Use+TestInitialize+to+run+code+before+running+each+test+
[TestInitialize()]
public+void+MyTestInitialize()+{+}

//+Use+TestCleanup+to+run+code+after+each+test+has+run
[TestCleanup()]
public+void+MyTestCleanup()+{+}|code-block|syntax|javascript|1171605|entityMap^0|E|E|T|B|0|L|F|11|C|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|12|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|13|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|14|8|@]|D|@]|E|$O|P]]|$1|Q|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|R|$]]

<code>TestInitialize</code> and <code>TestCleanup</code> are ran before and after each test, this is to ensure that no tests are coupled.

If you want to run methods before and after ALL tests, decorate relevant methods with the <code>ClassInitialize</code> and <code>ClassCleanup</code> attributes.

Relevant information from the auto generated test-file in Visual Studio:

You can use the following additional attributes as you write your tests:

<pre class="lang-cs prettyprint-override"><code>// Use ClassInitialize to run code before running the first test in the class
[ClassInitialize()]
public static void MyClassInitialize(TestContext testContext) { }

// Use ClassCleanup to run code after all tests in a class have run
[ClassCleanup()]
public static void MyClassCleanup() { }

// Use TestInitialize to run code before running each test 
[TestInitialize()]
public void MyTestInitialize() { }

// Use TestCleanup to run code after each test has run
[TestCleanup()]
public void MyTestCleanup() { }
</code></pre>

blocks|key|1171672|text|使用TestInitialize()属性标记的方法用于准备单元测试将在其中运行的环境的各个方面。这样做的目的是建立一个运行单元测试的已知状态。您可以使用TestInitialize()方法来复制、更改或创建测试将使用的某些数据文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1171673|创建标记有TestCleanUp{}属性的方法，以便在测试运行后将环境返回到已知状态。这可能意味着删除文件夹中的文件或将数据库恢复到已知状态。例如，在测试订单输入应用程序中使用的方法后，将库存数据库重置为初始状态。|1171674|如需更多信息，请访问：http://msdn.microsoft.com/en-us/library/ms182517%2528v=vs.100%2529.aspx|offset|length|1171675|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/ms182517%2528v=vs.100%2529.aspx^0|0|0|B|1V|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

Methods that are marked with [TestInitialize()] attribute are used to prepare aspects of the environment in which your unit test will run. The purpose of this is to establish a known state for running your unit test. You may use the [TestInitialize()] method to copy, alter, or create certain data files that your test will use.

Create methods that are marked with [TestCleanUp{}] attribute to return the environment to a known state after a test has run. This might mean the deletion of files in folders or the return of a database to a known state. An example of this is to reset an inventory database to an initial state after testing a method that is used in an order-entry application. 

For more information please refer :
<a href="http://msdn.microsoft.com/en-us/library/ms182517%28v=vs.100%29.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/ms182517%28v=vs.100%29.aspx</a>

blocks|key|1171736|text|取自microsoft+documentation的完整示例|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1171737|using+Microsoft.VisualStudio.TestTools.UnitTesting;
using+SampleClassLib;
using+System;
using+System.Windows.Forms;

namespace+TestNamespace
{
++++[TestClass()]
++++public+sealed+class+DivideClassTest
++++{
++++++++[AssemblyInitialize()]
++++++++public+static+void+AssemblyInit(TestContext+context)
++++++++{
++++++++++++MessageBox.Show("AssemblyInit+"+%2B+context.TestName);
++++++++}

++++++++[ClassInitialize()]
++++++++public+static+void+ClassInit(TestContext+context)
++++++++{
++++++++++++MessageBox.Show("ClassInit+"+%2B+context.TestName);
++++++++}

++++++++[TestInitialize()]
++++++++public+void+Initialize()
++++++++{
++++++++++++MessageBox.Show("TestMethodInit");
++++++++}

++++++++[TestCleanup()]
++++++++public+void+Cleanup()
++++++++{
++++++++++++MessageBox.Show("TestMethodCleanup");
++++++++}

++++++++[ClassCleanup()]
++++++++public+static+void+ClassCleanup()
++++++++{
++++++++++++MessageBox.Show("ClassCleanup");
++++++++}

++++++++[AssemblyCleanup()]
++++++++public+static+void+AssemblyCleanup()
++++++++{
++++++++++++MessageBox.Show("AssemblyCleanup");
++++++++}

++++++++[TestMethod()]
++++++++[ExpectedException(typeof(System.DivideByZeroException))]
++++++++public+void+DivideMethodTest()
++++++++{
++++++++++++DivideClass.DivideMethod(0);
++++++++}
++++}
}|code-block|syntax|javascript|1171738|entityMap|0|LINK|mutability|MUTABLE|url|https://msdn.microsoft.com/en-us/library/microsoft.visualstudio.testtools.unittesting.testinitializeattribute.aspx#Examples^0|2|N|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Full example taken from the <a href="https://msdn.microsoft.com/en-us/library/microsoft.visualstudio.testtools.unittesting.testinitializeattribute.aspx#Examples" rel="noreferrer">microsoft documentation</a>:

<pre><code>using Microsoft.VisualStudio.TestTools.UnitTesting;
using SampleClassLib;
using System;
using System.Windows.Forms;

namespace TestNamespace
{
 [TestClass()]
 public sealed class DivideClassTest
 {
 [AssemblyInitialize()]
 public static void AssemblyInit(TestContext context)
 {
 MessageBox.Show("AssemblyInit " + context.TestName);
 }

 [ClassInitialize()]
 public static void ClassInit(TestContext context)
 {
 MessageBox.Show("ClassInit " + context.TestName);
 }

 [TestInitialize()]
 public void Initialize()
 {
 MessageBox.Show("TestMethodInit");
 }

 [TestCleanup()]
 public void Cleanup()
 {
 MessageBox.Show("TestMethodCleanup");
 }

 [ClassCleanup()]
 public static void ClassCleanup()
 {
 MessageBox.Show("ClassCleanup");
 }

 [AssemblyCleanup()]
 public static void AssemblyCleanup()
 {
 MessageBox.Show("AssemblyCleanup");
 }

 [TestMethod()]
 [ExpectedException(typeof(System.DivideByZeroException))]
 public void DivideMethodTest()
 {
 DivideClass.DivideMethod(0);
 }
 }
}
</code></pre>

I'm using Visual Studio 2010 Beta 2. I've got a single <code>[TestClass]</code>, which has a <code>[TestInitialize]</code>, <code>[TestCleanup]</code> and a few <code>[TestMethods]</code>.

Every time a test method is run, the initialize and cleanup methods are ALSO run!

I was under the impression that the <code>[TestInitialize]</code> &amp; <code>[TestCleanup]</code> should only be run once, per local test run.

Is that correct? If not, what is the proper way to do this?

Why does TestInitialize get fired for every test in my Visual Studio unit tests?

Visual Studio

单元测试

数据库

Windows

我使用的是Visual Studio2010Beta2，我只有一个[TestClass]，它有一个[TestInitialize]、[TestCleanup]和几个[TestMethods]。每次运行测试方法时，initialize和cleanup方法也会运行！我的印象是，每次本地测试运行时，[TestInitiali...

问为什么我的Visual Studio单元测试中的每个测试都会触发TestInitialize？
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