PowerShell-master/test/powershell/Modules/Microsoft.PowerShell.Utility/Get-EventSubscriber.Tests.ps1

# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.
Describe "Get-EventSubscriber" -Tags "CI" {

    AfterEach {
	Unregister-Event -SourceIdentifier PesterTestRegister -ErrorAction SilentlyContinue
    }

    Context "Check return type of Get-EventSubscriber" {

	It "Should return System.Management.Automation.PSEventSubscriber as return type of New-Event" {
	    $pesterobject = (New-Object System.Collections.ObjectModel.ObservableCollection[object])
	    Register-ObjectEvent -InputObject $pesterobject -EventName CollectionChanged -SourceIdentifier PesterTestRegister
	    Get-EventSubscriber | Should -BeOfType System.Management.Automation.PSEventSubscriber
	}
    }

    Context "Check Get-EventSubscriber can validly register events"{
	It "Should return source identifier of PesterTimer " {
	    $pesterobject = (New-Object System.Collections.ObjectModel.ObservableCollection[object])
	    Register-ObjectEvent -InputObject $pesterobject -EventName CollectionChanged -SourceIdentifier PesterTestRegister
	    (Get-EventSubscriber -SourceIdentifier PesterTestRegister).SourceIdentifier | Should -BeExactly "PesterTestRegister"
	}

	It "Should return an integer greater than 0 for the SubscriptionId" {
	    $pesterobject = (New-Object System.Collections.ObjectModel.ObservableCollection[object])
	    Register-ObjectEvent -InputObject $pesterobject -EventName CollectionChanged -SourceIdentifier PesterTestRegister
	    (Get-EventSubscriber -SourceIdentifier PesterTestRegister).SubscriptionId | Should -BeGreaterThan 0

	}
    }
}