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AssemblyInitializeAttribute Class

AssemblyInitializeAttribute Class

Identifies a method that contains code to be used before all tests in the assembly have run and to allocate resources obtained by the assembly. This class cannot be inherited.

Namespace: Microsoft.VisualStudio.TestTools.UnitTesting
Assembly: Microsoft.VisualStudio.QualityTools.UnitTestFramework (in microsoft.visualstudio.qualitytools.unittestframework.dll)

'Declaration
<AttributeUsageAttribute(AttributeTargets.Method, AllowMultiple:=False)> _
Public NotInheritable Class AssemblyInitializeAttribute
	Inherits Attribute
'Usage
Dim instance As AssemblyInitializeAttribute

/** @attribute AttributeUsageAttribute(AttributeTargets.Method, AllowMultiple=false) */ 
public final class AssemblyInitializeAttribute extends Attribute
AttributeUsageAttribute(AttributeTargets.Method, AllowMultiple=false) 
public final class AssemblyInitializeAttribute extends Attribute

The method marked with this attribute will be run before methods marked with the ClassInitializeAttribute, TestInitializeAttribute, and TestMethodAttribute attributes. Only one method in an assembly may be decorated with this attribute.

NoteImportant

This attribute should not be used on ASP.NET unit tests, that is, any test with [HostType("ASP.NET")] attribute. Because of the stateless nature of IIS and ASP.NET, a method decorated with this attribute might be called more than once per test run.

This attribute can be specified on a method. Only one instance of this attribute may be applied to a method.

NoteNote

The test engine runs a method that is marked with the AssemblyInitialize attribute only if that method is a member of a class that is marked with the TestClass attribute.

For more information about how to use attributes, see Extending Metadata Using Attributes.

The following examples demonstrate the initialization and clean-up attributes that are used to indicate which methods should be run by the test engine at different periods of the test.

The first code samples contain a class and method to test. To run this example, create a class library project and replace the code with the following example.

Imports System

Namespace SampleClassLib
    Public Class DivideClass
        Shared Function DivideMethod(ByVal denominator As Integer) As Integer
            Return 2 \ denominator
        End Function
    End Class
End Namespace

The following example contains code to test DivideMethod() found in the previous code examples. Create a test project and put the following code in a test class document. Add the appropriate references to the project. This code contains attributes that control the initialization and clean-up execution order for the method, class, and assembly.

In particular, note the AssemblyInitialize attribute on the AssemblyInit()method.

Imports Microsoft.VisualStudio.TestTools.UnitTesting
Imports SampleClassLib2.SampleClassLib
Imports System
Imports System.IO
Imports System.Windows.Forms

Namespace TestNamespace
    <TestClass()> _
    Public NotInheritable Class DivideClassTest
        <AssemblyInitialize()> _
        Public Shared Sub AssemblyInit(ByVal context As TestContext)
            MsgBox("AssemblyInit " + context.TestName)
        End Sub 'AssemblyInit

        <ClassInitialize()> _
        Public Shared Sub ClassInit(ByVal context As TestContext)
            MsgBox("ClassInit " + context.TestName)
        End Sub 'ClassInit

        <TestInitialize()> _
        Public Sub Initialize()
            MsgBox("TestMethodInit")
        End Sub 

        <TestCleanup()> _
        Public Sub Cleanup()
            MsgBox("TestMethodCleanup")
        End Sub 

        <ClassCleanup()> _
        Public Shared Sub ClassCleanup()
            MsgBox("ClassCleanup")
        End Sub 

        <AssemblyCleanup()> _
        Public Shared Sub AssemblyCleanup()
            MsgBox("AssemblyCleanup")
        End Sub

        <TestMethod()> _
        <ExpectedException(GetType(System.DivideByZeroException))> _
        Public Sub DivideMethodTest()
            DivideClass.DivideMethod(0)
        End Sub
    End Class
End Namespace

System.Object
   System.Attribute
    Microsoft.VisualStudio.TestTools.UnitTesting.AssemblyInitializeAttribute

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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