diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0bc6e25..bddb131 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
-- ActiveDirectoryCSDsc
+- `ActiveDirectoryCSDsc`
   - Automatically publish documentation to GitHub Wiki - Fixes [Issue #122](https://github.com/dsccommunity/ActiveDirectoryCSDsc/issues/122).
   - Revert Pester to non-prerelease.
   - Use DscResource.Base pre-release.
@@ -22,7 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `Tests` - Migrate all tests to Pester 5.
 - Include module file in code coverage.
 - Add RootModule to Module psd1.
-- AdcsAuthorityInformationAccess
+- `AdcsAuthorityInformationAccess`
   - Removed `AllowRestartService` parameter from compared settings, force `Get-CaAiaUriList`
     to return unmangled `System.String[]` with single values.
     Fixes [Issue #128](https://github.com/dsccommunity/ActiveDirectoryCSDsc/issues/128)
@@ -35,6 +35,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - Move to Private function.
 - `Restart-ServiceIfExists`
   - Change Write-Verbose to Write-Debug.
+- `AdcsOnlineResponder`
+  - Convert to class-based resource [#155](https://github.com/dsccommunity/ActiveDirectoryCSDsc/issues/155).
 
 ### Added
 
diff --git a/RequiredModules.psd1 b/RequiredModules.psd1
index 4dfbf88..2a153c8 100644
--- a/RequiredModules.psd1
+++ b/RequiredModules.psd1
@@ -38,7 +38,12 @@
             AllowPrerelease = $true
         }
     }
-    'DscResource.Common'           = 'latest'
+    'DscResource.Common'           = @{
+        Version    = 'latest'
+        Parameters = @{
+            AllowPrerelease = $true
+        }
+    }
 
     # Analyzer rules
     'DscResource.AnalyzerRules'    = 'latest'
diff --git a/source/ActiveDirectoryCSDsc.psd1 b/source/ActiveDirectoryCSDsc.psd1
index 745d0e1..6fbf6c5 100644
--- a/source/ActiveDirectoryCSDsc.psd1
+++ b/source/ActiveDirectoryCSDsc.psd1
@@ -27,7 +27,7 @@
     FunctionsToExport    = @()
 
     # Cmdlets to export from this module, for best performance, do not use wildcards and do not delete the entry, use an empty array if there are no cmdlets to export.
-    CmdletsToExport      = @()
+    CmdletsToExport      = '*'
 
     # Variables to export from this module
     VariablesToExport    = @()
diff --git a/source/Classes/020.AdcsOnlineResponder.ps1 b/source/Classes/020.AdcsOnlineResponder.ps1
new file mode 100644
index 0000000..3b0fb65
--- /dev/null
+++ b/source/Classes/020.AdcsOnlineResponder.ps1
@@ -0,0 +1,135 @@
+<#
+    .SYNOPSIS
+        The `AdcsOnlineResponder` DSC resource is used to configure the
+        ADCS Online Responder after the feature has been installed on the server.
+
+    .DESCRIPTION
+        This resource can be used to install an ADCS Online Responder after the feature
+        has been installed on the server.
+        Using this DSC Resource to configure an ADCS Certificate Authority assumes that
+        the ```ADCS-Online-Responder``` feature has already been installed.
+
+    .PARAMETER IsSingleInstance
+        Specifies the resource is a single instance, the value must be 'Yes'.
+
+    .PARAMETER Credential
+        If the Online Responder service is configured to use Standalone certification authority,
+        then an account that is a member of the local Administrators on the CA is required. If
+        the Online Responder service is configured to use an Enterprise CA, then an account that
+        is a member of Domain Admins is required.
+
+    .PARAMETER Ensure
+        Specifies whether the Online Responder feature should be installed or uninstalled.
+
+    .PARAMETER Reasons
+        Returns the reason a property is not in desired state.
+#>
+
+[DscResource(RunAsCredential = 'NotSupported')]
+class AdcsOnlineResponder : ResourceBase
+{
+    [DscProperty(Key)]
+    [System.String]
+    $IsSingleInstance = 'Yes'
+
+    [DscProperty(Mandatory)]
+    [System.Management.Automation.PSCredential]
+    [System.Management.Automation.Credential()]
+    $Credential
+
+    [DscProperty()]
+    [Ensure]
+    $Ensure = [Ensure]::Present
+
+    [DscProperty(NotConfigurable)]
+    [AdcsReason[]]
+    $Reasons
+
+    AdcsOnlineResponder () : base ($PSScriptRoot)
+    {
+        # These properties will not be enforced.
+        $this.ExcludeDscProperties = @(
+            'IsSingleInstance'
+            'Credential'
+        )
+    }
+
+    [AdcsOnlineResponder] Get()
+    {
+        # Call the base method to return the properties.
+        return ([ResourceBase] $this).Get()
+    }
+
+    # Base method Get() calls this method to get the current state as a Hashtable.
+    [System.Collections.Hashtable] GetCurrentState([System.Collections.Hashtable] $properties)
+    {
+        try
+        {
+            $null = Install-AdcsOnlineResponder -Credential $this.Credential -WhatIf
+
+            return @{}
+        }
+        catch
+        {
+            if ($_.Exception.GetType().FullName -eq 'Microsoft.CertificateServices.Deployment.Common.OCSP.OnlineResponderSetupException')
+            {
+                return @{
+                    IsSingleInstance = $this.IsSingleInstance
+                }
+            }
+
+            return New-InvalidOperationException -Message $this.localizedData.ErrorGetCurrentState -ErrorRecord $_
+        }
+    }
+
+    [void] Set()
+    {
+        # Call the base method to enforce the properties.
+        ([ResourceBase] $this).Set()
+    }
+
+    <#
+        Base method Set() call this method with the properties that should be
+        enforced and that are not in desired state.
+    #>
+    hidden [void] Modify([System.Collections.Hashtable] $properties)
+    {
+        if ($properties.ContainsKey('Ensure') -and $properties.Ensure -eq [Ensure]::Absent)
+        {
+            try
+            {
+                $null = Uninstall-AdcsOnlineResponder -Force
+            }
+            catch
+            {
+                New-InvalidOperationException -Message $_.Exception.Message -ErrorRecord $_
+            }
+        }
+        else
+        {
+            try
+            {
+                $null = Install-AdcsOnlineResponder -Credential $this.Credential -Force
+            }
+            catch
+            {
+                New-InvalidOperationException -Message $_.Exception.Message -ErrorRecord $_
+            }
+        }
+    }
+
+    [System.Boolean] Test()
+    {
+        # Call the base method to test all of the properties that should be enforced.
+        return ([ResourceBase] $this).Test()
+    }
+
+    <#
+        Base method Assert() call this method with the properties that was assigned
+        a value.
+    #>
+    hidden [void] AssertProperties([System.Collections.Hashtable] $properties)
+    {
+        Assert-Module -ModuleName 'ADCSDeployment'
+    }
+}
diff --git a/source/DSCResources/DSC_AdcsOnlineResponder/DSC_AdcsOnlineResponder.psm1 b/source/DSCResources/DSC_AdcsOnlineResponder/DSC_AdcsOnlineResponder.psm1
deleted file mode 100644
index bae7768..0000000
--- a/source/DSCResources/DSC_AdcsOnlineResponder/DSC_AdcsOnlineResponder.psm1
+++ /dev/null
@@ -1,269 +0,0 @@
-$modulePath = Join-Path -Path (Split-Path -Path (Split-Path -Path $PSScriptRoot -Parent) -Parent) -ChildPath 'Modules'
-
-# Import the ADCS Deployment Resource Common Module.
-Import-Module -Name (Join-Path -Path $modulePath `
-        -ChildPath (Join-Path -Path 'ActiveDirectoryCSDsc.Common' `
-            -ChildPath 'ActiveDirectoryCSDsc.Common.psm1'))
-
-Import-Module -Name (Join-Path -Path $modulePath -ChildPath 'DscResource.Common')
-
-# Import Localization Strings.
-$script:localizedData = Get-LocalizedData -DefaultUICulture 'en-US'
-
-<#
-    .SYNOPSIS
-        Returns an object containing the current state information for the ADCS Online Responder.
-
-    .PARAMETER IsSingleInstance
-        Specifies the resource is a single instance, the value must be 'Yes'.
-
-    .PARAMETER Credential
-        If the Online Responder service is configured to use Standalone certification authority,
-        then an account that is a member of the local Administrators on the CA is required. If
-        the Online Responder service is configured to use an Enterprise CA, then an account that
-        is a member of Domain Admins is required.
-
-    .PARAMETER Ensure
-        Specifies whether the Online Responder feature should be installed or uninstalled.
-
-    .OUTPUTS
-        Returns an object containing the ADCS Online Responder state information.
-#>
-function Get-TargetResource
-{
-    [CmdletBinding()]
-    [OutputType([System.Collections.Hashtable])]
-    param
-    (
-        [Parameter(Mandatory = $true)]
-        [ValidateSet('Yes')]
-        [System.String]
-        $IsSingleInstance,
-
-        [Parameter(Mandatory = $true)]
-        [System.Management.Automation.PSCredential]
-        [System.Management.Automation.Credential()]
-        $Credential,
-
-        [Parameter()]
-        [ValidateSet('Present', 'Absent')]
-        [System.String]
-        $Ensure = 'Present'
-    )
-
-    Write-Verbose -Message ( @(
-            "$($MyInvocation.MyCommand): "
-            $($script:localizedData.GettingAdcsOnlineResponderStatusMessage)
-        ) -join '' )
-
-    $adcsParameters = @{ } + $PSBoundParameters
-    $null = $adcsParameters.Remove('IsSingleInstance')
-    $null = $adcsParameters.Remove('Ensure')
-    $null = $adcsParameters.Remove('Debug')
-    $null = $adcsParameters.Remove('ErrorAction')
-
-    try
-    {
-        $null = Install-AdcsOnlineResponder @adcsParameters -WhatIf
-        # CA is not installed
-        $Ensure = 'Absent'
-    }
-    catch [Microsoft.CertificateServices.Deployment.Common.OCSP.OnlineResponderSetupException]
-    {
-        # CA is already installed
-        $Ensure = 'Present'
-    }
-    catch
-    {
-        # Something else went wrong
-        throw $_
-    }
-
-    return @{
-        Ensure     = $Ensure
-        Credential = $Credential
-    }
-} # function Get-TargetResource
-
-<#
-    .SYNOPSIS
-        Installs or uinstalls the ADCS Online Responder from the server.
-
-    .PARAMETER IsSingleInstance
-        Specifies the resource is a single instance, the value must be 'Yes'.
-
-    .PARAMETER Credential
-        If the Online Responder service is configured to use Standalone certification authority,
-        then an account that is a member of the local Administrators on the CA is required. If
-        the Online Responder service is configured to use an Enterprise CA, then an account that
-        is a member of Domain Admins is required.
-
-    .PARAMETER Ensure
-        Specifies whether the Online Responder feature should be installed or uninstalled.
-#>
-function Set-TargetResource
-{
-    [CmdletBinding()]
-    param
-    (
-        [Parameter(Mandatory = $true)]
-        [ValidateSet('Yes')]
-        [System.String]
-        $IsSingleInstance,
-
-        [Parameter(Mandatory = $true)]
-        [System.Management.Automation.PSCredential]
-        [System.Management.Automation.Credential()]
-        $Credential,
-
-        [Parameter()]
-        [ValidateSet('Present', 'Absent')]
-        [System.String]
-        $Ensure = 'Present'
-    )
-
-    Write-Verbose -Message ( @(
-            "$($MyInvocation.MyCommand): "
-            $($script:localizedData.SettingAdcsOnlineResponderStatusMessage)
-        ) -join '' )
-
-    $adcsParameters = @{ } + $PSBoundParameters
-    $null = $adcsParameters.Remove('IsSingleInstance')
-    $null = $adcsParameters.Remove('Ensure')
-    $null = $adcsParameters.Remove('Debug')
-    $null = $adcsParameters.Remove('ErrorAction')
-
-    $errorMessage = ''
-
-    if ($Ensure -eq 'Present')
-    {
-        Write-Verbose -Message ( @(
-                "$($MyInvocation.MyCommand): "
-                $($script:localizedData.InstallingAdcsOnlineResponderMessage)
-            ) -join '' )
-
-        $errorMessage = (Install-AdcsOnlineResponder @adcsParameters -Force).ErrorString
-    }
-    else
-    {
-        Write-Verbose -Message ( @(
-                "$($MyInvocation.MyCommand): "
-                $($script:localizedData.UninstallingAdcsOnlineResponderMessage)
-            ) -join '' )
-
-        $errorMessage = (Uninstall-AdcsOnlineResponder -Force).ErrorString
-    }
-
-    if (-not [System.String]::IsNullOrEmpty($errorMessage))
-    {
-        New-InvalidOperationException -Message $errorMessage
-    }
-} # function Set-TargetResource
-
-<#
-    .SYNOPSIS
-        Tests is the ADCS Online Responder is in the desired state.
-
-    .PARAMETER IsSingleInstance
-        Specifies the resource is a single instance, the value must be 'Yes'.
-
-    .PARAMETER Credential
-        If the Online Responder service is configured to use Standalone certification authority,
-        then an account that is a member of the local Administrators on the CA is required. If
-        the Online Responder service is configured to use an Enterprise CA, then an account that
-        is a member of Domain Admins is required.
-
-    .PARAMETER Ensure
-        Specifies whether the Online Responder feature should be installed or uninstalled.
-
-    .OUTPUTS
-        Returns true if the ADCS Online Responder is in the desired state.
-#>
-function Test-TargetResource
-{
-    [CmdletBinding()]
-    [OutputType([System.Boolean])]
-    param
-    (
-        [Parameter(Mandatory = $true)]
-        [ValidateSet('Yes')]
-        [System.String]
-        $IsSingleInstance,
-
-        [Parameter(Mandatory = $true)]
-        [System.Management.Automation.PSCredential]
-        [System.Management.Automation.Credential()]
-        $Credential,
-
-        [Parameter()]
-        [ValidateSet('Present', 'Absent')]
-        [System.String]
-        $Ensure = 'Present'
-    )
-
-    Write-Verbose -Message ( @(
-            "$($MyInvocation.MyCommand): "
-            $script:localizedData.TestingAdcsOnlineResponderStatusMessage
-        ) -join '' )
-
-    $adcsParameters = @{ } + $PSBoundParameters
-    $null = $adcsParameters.Remove('IsSingleInstance')
-    $null = $adcsParameters.Remove('Ensure')
-    $null = $adcsParameters.Remove('Debug')
-    $null = $adcsParameters.Remove('ErrorAction')
-
-    try
-    {
-        $null = Install-AdcsOnlineResponder @adcsParameters -WhatIf
-        # Online Responder is not installed
-        if ($Ensure -eq 'Present')
-        {
-            # Online Responder is not installed but should be - change required
-            Write-Verbose -Message ( @(
-                    "$($MyInvocation.MyCommand): "
-                    $($script:localizedData.AdcsOnlineResponderNotInstalledButShouldBeMessage)
-                ) -join '' )
-
-            return $false
-        }
-        else
-        {
-            # Online Responder is not installed and should not be - change not required
-            Write-Verbose -Message ( @(
-                    "$($MyInvocation.MyCommand): "
-                    $($script:localizedData.AdcsOnlineResponderNotInstalledAndShouldNotBeMessage)
-                ) -join '' )
-
-            return $true
-        }
-    }
-    catch [Microsoft.CertificateServices.Deployment.Common.OCSP.OnlineResponderSetupException]
-    {
-        # Online Responder is already installed
-        if ($Ensure -eq 'Present')
-        {
-            # Online Responder is installed and should be - change not required
-            Write-Verbose -Message ( @(
-                    "$($MyInvocation.MyCommand): "
-                    $($script:localizedData.AdcsOnlineResponderInstalledAndShouldBeMessage)
-                ) -join '' )
-
-            return $true
-        }
-        else
-        {
-            # Online Responder is installed and should not be - change required
-            Write-Verbose -Message ( @(
-                    "$($MyInvocation.MyCommand): "
-                    $($script:localizedData.AdcsOnlineResponderInstalledButShouldNotBeMessage)
-                ) -join '' )
-
-            return $false
-        }
-    }
-    catch
-    {
-        # Something else went wrong
-        throw $_
-    } # try
-} # function Test-TargetResource
diff --git a/source/DSCResources/DSC_AdcsOnlineResponder/DSC_AdcsOnlineResponder.schema.mof b/source/DSCResources/DSC_AdcsOnlineResponder/DSC_AdcsOnlineResponder.schema.mof
deleted file mode 100644
index fbc89da..0000000
--- a/source/DSCResources/DSC_AdcsOnlineResponder/DSC_AdcsOnlineResponder.schema.mof
+++ /dev/null
@@ -1,7 +0,0 @@
-[ClassVersion("0.1.0.0"), FriendlyName("AdcsOnlineResponder")]
-class DSC_AdcsOnlineResponder : OMI_BaseResource
-{
-    [Key, Description("Specifies the resource is a single instance, the value must be 'Yes'"), ValueMap{"Yes"}, Values{"Yes"}] String IsSingleInstance;
-    [Required, Description("If the Online Responder service is configured to use Standalone certification authority, then an account that is a member of the local Administrators on the CA is required. If the Online Responder service is configured to use an Enterprise CA, then an account that is a member of Domain Admins is required."), EmbeddedInstance("MSFT_Credential")] String Credential;
-    [Write, Description("Specifies whether the Online Responder feature should be installed or uninstalled."), ValueMap{"Present","Absent"}, Values{"Present","Absent"}] String Ensure;
-};
diff --git a/source/DSCResources/DSC_AdcsOnlineResponder/README.md b/source/DSCResources/DSC_AdcsOnlineResponder/README.md
deleted file mode 100644
index c3b93bb..0000000
--- a/source/DSCResources/DSC_AdcsOnlineResponder/README.md
+++ /dev/null
@@ -1,7 +0,0 @@
-# Description
-
-This resource can be used to install an ADCS Online Responder after the feature
-has been installed on the server.
-Using this DSC Resource to configure an ADCS Certificate Authority assumes that
-the ```ADCS-Online-Responder``` feature has already been installed.
-For more information on ADCS Online Responders, see [this article on TechNet](https://technet.microsoft.com/en-us/library/cc725958.aspx).
diff --git a/source/DSCResources/DSC_AdcsOnlineResponder/en-US/DSC_AdcsOnlineResponder.strings.psd1 b/source/DSCResources/DSC_AdcsOnlineResponder/en-US/DSC_AdcsOnlineResponder.strings.psd1
deleted file mode 100644
index 4fd9406..0000000
--- a/source/DSCResources/DSC_AdcsOnlineResponder/en-US/DSC_AdcsOnlineResponder.strings.psd1
+++ /dev/null
@@ -1,13 +0,0 @@
-# Localized resources for DSC_AdcsOnlineResponder
-
-ConvertFrom-StringData @'
-    GettingAdcsOnlineResponderStatusMessage = Getting ADCS Online Responder Status.
-    TestingAdcsOnlineResponderStatusMessage = Testing ADCS Online Responder Status.
-    AdcsOnlineResponderInstalledButShouldNotBeMessage = ADCS Online Responder is installed but should not be. Change required.
-    AdcsOnlineResponderInstalledAndShouldBeMessage = ADCS Online Responder is installed and should be. Change not required.
-    AdcsOnlineResponderNotInstalledButShouldBeMessage = ADCS Online Responder is not installed but should be. Change required.
-    AdcsOnlineResponderNotInstalledAndShouldNotBeMessage = ADCS Online Responder is not installed and should not be. Change not required.
-    SettingAdcsOnlineResponderStatusMessage = Setting ADCS Online Responder Status.
-    InstallingAdcsOnlineResponderMessage = Installing ADCS Online Responder.
-    UninstallingAdcsOnlineResponderMessage = Uninstalling ADCS Online Responder.
-'@
diff --git a/source/en-US/AdcsOnlineResponder.strings.psd1 b/source/en-US/AdcsOnlineResponder.strings.psd1
new file mode 100644
index 0000000..000b069
--- /dev/null
+++ b/source/en-US/AdcsOnlineResponder.strings.psd1
@@ -0,0 +1,13 @@
+<#
+    .SYNOPSIS
+        The localized resource strings in English (en-US) for the
+        resource AdcsOnlineResponder.
+#>
+
+ConvertFrom-StringData @'
+    ## Strings overrides for the ResourceBase's default strings.
+    # None
+
+    ## Strings directly used by the derived class AdcsOnlineResponder.
+    ErrorGetCurrentState = GetCurrentState() failed with an unexpected error. (ADCSOR0001)
+'@
diff --git a/tests/Integration/DSC_AdcsCertificationAuthority.Integration.Tests.ps1 b/tests/Integration/DSC_AdcsCertificationAuthority.Integration.Tests.ps1
index 15fd8e6..b3e2ef7 100644
--- a/tests/Integration/DSC_AdcsCertificationAuthority.Integration.Tests.ps1
+++ b/tests/Integration/DSC_AdcsCertificationAuthority.Integration.Tests.ps1
@@ -245,6 +245,10 @@ Describe 'DSC_AdcsAuthorityInformationAccess_Integration' -Skip:$skipIntegration
             }
         }
 
+        AfterEach {
+            Wait-ForIdleLcm
+        }
+
         It 'Should compile and apply the MOF without throwing' {
             {
                 & 'DSC_AdcsAuthorityInformationAccess_Config' `
@@ -290,6 +294,10 @@ Describe 'DSC_AdcsAuthorityInformationAccess_Integration' -Skip:$skipIntegration
             }
         }
 
+        AfterEach {
+            Wait-ForIdleLcm
+        }
+
         It 'Should compile and apply the MOF without throwing' {
             {
                 & 'DSC_AdcsAuthorityInformationAccess_Config' `
diff --git a/tests/Unit/Classes/AdcsAuthorityInformationAccess.Tests.ps1 b/tests/Unit/Classes/AdcsAuthorityInformationAccess.Tests.ps1
index 74b8b45..c73d1e5 100644
--- a/tests/Unit/Classes/AdcsAuthorityInformationAccess.Tests.ps1
+++ b/tests/Unit/Classes/AdcsAuthorityInformationAccess.Tests.ps1
@@ -594,15 +594,15 @@ Describe 'AdcsAuthorityInformationAccess\Test()' -Tag 'Test' {
                         $script:getMethodCallCount += 1
                     }
             }
+        }
 
-            It 'Should return $true' {
-                InModuleScope -ScriptBlock {
-                    Set-StrictMode -Version 1.0
+        It 'Should return $true' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
 
-                    $script:mockInstance.Test() | Should -BeTrue
+                $script:mockInstance.Test() | Should -BeTrue
 
-                    $script:getMethodCallCount | Should -Be 1
-                }
+                $script:getMethodCallCount | Should -Be 1
             }
         }
     }
diff --git a/tests/Unit/Classes/AdcsOnlineResponder.Tests.ps1 b/tests/Unit/Classes/AdcsOnlineResponder.Tests.ps1
new file mode 100644
index 0000000..4b1c418
--- /dev/null
+++ b/tests/Unit/Classes/AdcsOnlineResponder.Tests.ps1
@@ -0,0 +1,764 @@
+<#
+    .SYNOPSIS
+        Unit test for AdcsOnlineResponder DSC resource.
+#>
+
+# Suppressing this rule because Script Analyzer does not understand Pester's syntax.
+[System.Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSUseDeclaredVarsMoreThanAssignments', '')]
+param ()
+
+BeforeDiscovery {
+    try
+    {
+        if (-not (Get-Module -Name 'DscResource.Test'))
+        {
+            # Assumes dependencies has been resolved, so if this module is not available, run 'noop' task.
+            if (-not (Get-Module -Name 'DscResource.Test' -ListAvailable))
+            {
+                # Redirect all streams to $null, except the error stream (stream 2)
+                & "$PSScriptRoot/../../../build.ps1" -Tasks 'noop' 3>&1 4>&1 5>&1 6>&1 > $null
+            }
+
+            # If the dependencies has not been resolved, this will throw an error.
+            Import-Module -Name 'DscResource.Test' -Force -ErrorAction 'Stop'
+        }
+    }
+    catch [System.IO.FileNotFoundException]
+    {
+        throw 'DscResource.Test module dependency not found. Please run ".\build.ps1 -ResolveDependency -Tasks build" first.'
+    }
+}
+
+BeforeAll {
+    $script:dscModuleName = 'ActiveDirectoryCSDsc'
+
+    # Loading mocked exception class
+    # New-MockObject -Type Microsoft.CertificateServices.Deployment.Common.OCSP.OnlineResponderSetupException
+
+    Import-Module -Name $script:dscModuleName
+
+    # Load stub cmdlets and classes.
+    Import-Module -Name (Join-Path -Path $PSScriptRoot -ChildPath '..\Stubs\AdcsDeploymentStub.psm1')
+
+    $PSDefaultParameterValues['InModuleScope:ModuleName'] = $script:dscModuleName
+    $PSDefaultParameterValues['Mock:ModuleName'] = $script:dscModuleName
+    $PSDefaultParameterValues['Should:ModuleName'] = $script:dscModuleName
+}
+
+AfterAll {
+    $PSDefaultParameterValues.Remove('InModuleScope:ModuleName')
+    $PSDefaultParameterValues.Remove('Mock:ModuleName')
+    $PSDefaultParameterValues.Remove('Should:ModuleName')
+
+    # Unload stub module
+    Remove-Module -Name AdcsDeploymentStub -Force
+
+    # Unload the module being tested so that it doesn't impact any other tests.
+    Get-Module -Name $script:dscModuleName -All | Remove-Module -Force
+}
+
+Describe 'AdcsOnlineResponder' {
+    Context 'When class is instantiated' {
+        It 'Should not throw an exception' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                { [AdcsOnlineResponder]::new() } | Should -Not -Throw
+            }
+        }
+
+        It 'Should have a default or empty constructor' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $instance = [AdcsOnlineResponder]::new()
+                $instance | Should -Not -BeNullOrEmpty
+            }
+        }
+
+        It 'Should be the correct type' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $instance = [AdcsOnlineResponder]::new()
+                $instance.GetType().Name | Should -Be 'AdcsOnlineResponder'
+            }
+        }
+    }
+}
+
+Describe 'AdcsOnlineResponder\Get()' -Tag 'Get' {
+    Context 'When the system is in the desired state' {
+        Context 'When AdcsOnlineResponder is installed' {
+            BeforeAll {
+                InModuleScope -ScriptBlock {
+                    Set-StrictMode -Version 1.0
+
+                    $script:mockCredential = [System.Management.Automation.PSCredential]::new('Administrator', ([System.Security.SecureString]::new()))
+
+                    $script:mockInstance = [AdcsOnlineResponder] @{
+                        IsSingleInstance = 'Yes'
+                        Credential       = $script:mockCredential
+                    }
+
+                    <#
+                        This mocks the method GetCurrentState().
+                        This mocks the method Assert().
+                        This mocks the method Normalize().
+
+                        Method Get() will call the base method Get() which will
+                        call back to the derived class methods.
+                    #>
+                    $script:mockInstance |
+                        Add-Member -Force -MemberType 'ScriptMethod' -Name 'GetCurrentState' -Value {
+                            return @{
+                                IsSingleInstance = 'Yes'
+                                Credential       = $script:mockCredential
+                            }
+                        } -PassThru |
+                        Add-Member -Force -MemberType 'ScriptMethod' -Name 'Assert' -Value {
+                            return
+                        } -PassThru |
+                        Add-Member -Force -MemberType 'ScriptMethod' -Name 'Normalize' -Value {
+                            return
+                        } -PassThru
+                }
+            }
+
+            It 'Should return the correct values' {
+                InModuleScope -ScriptBlock {
+                    Set-StrictMode -Version 1.0
+
+                    $currentState = $script:mockInstance.Get()
+
+                    $currentState.IsSingleInstance | Should -Be 'Yes'
+
+                    $currentState.Credential | Should -Be $script:mockCredential
+                    $currentState.Ensure | Should -Be 'Present'
+
+                    $currentState.Reasons | Should -BeNullOrEmpty
+                }
+            }
+        }
+
+        Context 'When AdcsOnlineResponder is not installed' {
+            BeforeAll {
+                InModuleScope -ScriptBlock {
+                    Set-StrictMode -Version 1.0
+
+                    $script:mockInstance = [AdcsOnlineResponder] @{
+                        IsSingleInstance = 'Yes'
+                        Credential       = [System.Management.Automation.PSCredential]::new('Administrator', ([System.Security.SecureString]::new()))
+                        Ensure           = [Ensure]::Absent
+                    }
+
+                    <#
+                        This mocks the method GetCurrentState().
+                        This mocks the method Assert().
+                        This mocks the method Normalize().
+
+                        Method Get() will call the base method Get() which will
+                        call back to the derived class methods.
+                    #>
+                    $script:mockInstance |
+                        Add-Member -Force -MemberType 'ScriptMethod' -Name 'GetCurrentState' -Value {
+                            return @{}
+                        } -PassThru |
+                        Add-Member -Force -MemberType 'ScriptMethod' -Name 'Assert' -Value {
+                            return
+                        } -PassThru |
+                        Add-Member -Force -MemberType 'ScriptMethod' -Name 'Normalize' -Value {
+                            return
+                        } -PassThru
+                }
+            }
+
+            It 'Should return the correct values' {
+                InModuleScope -ScriptBlock {
+                    Set-StrictMode -Version 1.0
+
+                    $currentState = $script:mockInstance.Get()
+
+                    $currentState.IsSingleInstance | Should -Be 'Yes'
+
+                    $currentState.Credential | Should -BeNullOrEmpty
+                    $currentState.Ensure | Should -Be 'Absent'
+
+                    $currentState.Reasons | Should -HaveCount 0
+                }
+            }
+        }
+    }
+
+    Context 'When the system is not in the desired state' {
+        Context 'When AdcsOnlineResponder is installed' {
+            BeforeAll {
+                InModuleScope -ScriptBlock {
+                    Set-StrictMode -Version 1.0
+
+                    $script:mockCredential = [System.Management.Automation.PSCredential]::new('Administrator', ([System.Security.SecureString]::new()))
+
+                    $script:mockInstance = [AdcsOnlineResponder] @{
+                        IsSingleInstance = 'Yes'
+                        Credential       = $script:mockCredential
+                        Ensure           = [Ensure]::Absent
+                    }
+
+                    <#
+                        This mocks the method GetCurrentState().
+                        This mocks the method Assert().
+                        This mocks the method Normalize().
+
+                        Method Get() will call the base method Get() which will
+                        call back to the derived class methods.
+                    #>
+                    $script:mockInstance |
+                        Add-Member -Force -MemberType 'ScriptMethod' -Name 'GetCurrentState' -Value {
+                            return @{
+                                IsSingleInstance = 'Yes'
+                                Credential       = $script:mockCredential
+                            }
+                        } -PassThru |
+                        Add-Member -Force -MemberType 'ScriptMethod' -Name 'Assert' -Value {
+                            return
+                        } -PassThru |
+                        Add-Member -Force -MemberType 'ScriptMethod' -Name 'Normalize' -Value {
+                            return
+                        } -PassThru
+                }
+            }
+
+            It 'Should return the correct values' {
+                InModuleScope -ScriptBlock {
+                    Set-StrictMode -Version 1.0
+
+                    $currentState = $script:mockInstance.Get()
+
+                    $currentState.IsSingleInstance | Should -Be 'Yes'
+
+                    $currentState.Credential | Should -Be $script:mockCredential
+                    $currentState.Ensure | Should -Be 'Present'
+
+
+                    $currentState.Reasons | Should -HaveCount 1
+                    $currentState.Reasons[0].Code | Should -Be 'AdcsOnlineResponder:AdcsOnlineResponder:Ensure'
+                    $currentState.Reasons[0].Phrase | Should -Be 'The property Ensure should be "Absent", but was "Present"'
+                }
+            }
+        }
+
+        Context 'When AdcsOnlineResponder is not installed' {
+            BeforeAll {
+                InModuleScope -ScriptBlock {
+                    Set-StrictMode -Version 1.0
+
+                    $script:mockCredential = [System.Management.Automation.PSCredential]::new('Administrator', ([System.Security.SecureString]::new()))
+
+                    $script:mockInstance = [AdcsOnlineResponder] @{
+                        IsSingleInstance = 'Yes'
+                        Credential       = $script:mockCredential
+                    }
+
+                    <#
+                        This mocks the method GetCurrentState().
+                        This mocks the method Assert().
+                        This mocks the method Normalize().
+
+                        Method Get() will call the base method Get() which will
+                        call back to the derived class methods.
+                    #>
+                    $script:mockInstance |
+                        Add-Member -Force -MemberType 'ScriptMethod' -Name 'GetCurrentState' -Value {
+                            return @{}
+                        } -PassThru |
+                        Add-Member -Force -MemberType 'ScriptMethod' -Name 'Assert' -Value {
+                            return
+                        } -PassThru |
+                        Add-Member -Force -MemberType 'ScriptMethod' -Name 'Normalize' -Value {
+                            return
+                        } -PassThru
+                }
+            }
+
+            It 'Should return the correct values' {
+                InModuleScope -ScriptBlock {
+                    Set-StrictMode -Version 1.0
+
+                    $currentState = $script:mockInstance.Get()
+
+                    $currentState.IsSingleInstance | Should -Be 'Yes'
+
+                    $currentState.Credential | Should -BeNullOrEmpty
+                    $currentState.Ensure | Should -Be 'Absent'
+
+
+                    $currentState.Reasons | Should -HaveCount 1
+                    $currentState.Reasons[0].Code | Should -Be 'AdcsOnlineResponder:AdcsOnlineResponder:Ensure'
+                    $currentState.Reasons[0].Phrase | Should -Be 'The property Ensure should be "Present", but was "Absent"'
+                }
+            }
+        }
+    }
+}
+
+Describe 'AdcsOnlineResponder\Set()' -Tag 'Set' {
+    BeforeAll {
+        InModuleScope -ScriptBlock {
+            Set-StrictMode -Version 1.0
+
+            $script:mockCredential = [System.Management.Automation.PSCredential]::new('Administrator', ([System.Security.SecureString]::new()))
+
+            $script:mockInstance = [AdcsOnlineResponder] @{
+                IsSingleInstance = 'Yes'
+                Credential       = $script:mockCredential
+            } |
+                # Mock method Modify which is called by the case method Set().
+                Add-Member -Force -MemberType 'ScriptMethod' -Name 'Modify' -Value {
+                    $script:methodModifyCallCount += 1
+                } -PassThru
+        }
+    }
+
+    BeforeEach {
+        InModuleScope -ScriptBlock {
+            Set-StrictMode -Version 1.0
+
+            $script:methodTestCallCount = 0
+            $script:methodModifyCallCount = 0
+        }
+    }
+
+    Context 'When the system is in the desired state' {
+        BeforeAll {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance |
+                    # Mock method Test() which is called by the base method Set()
+                    Add-Member -Force -MemberType 'ScriptMethod' -Name 'Test' -Value {
+                        $script:methodTestCallCount += 1
+                        return $true
+                    }
+
+            }
+        }
+
+        It 'Should not call method Modify()' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance.Set()
+
+                $script:methodTestCallCount | Should -Be 1
+                $script:methodModifyCallCount | Should -Be 0
+            }
+        }
+    }
+
+    Context 'When the system is not in the desired state' {
+        BeforeAll {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance |
+                    # Mock method Test() which is called by the base method Set()
+                    Add-Member -Force -MemberType 'ScriptMethod' -Name 'Test' -Value {
+                        $script:methodTestCallCount += 1
+                        return $false
+                    }
+
+                $script:mockInstance.PropertiesNotInDesiredState = @(
+                    @{
+                        Property      = 'Ensure'
+                        ExpectedValue = 'Present'
+                        ActualValue   = 'Absent'
+                    }
+                )
+            }
+        }
+
+        It 'Should call method Modify()' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance.Set()
+
+                $script:methodTestCallCount | Should -Be 1
+                $script:methodModifyCallCount | Should -Be 1
+            }
+        }
+    }
+}
+
+Describe 'AdcsOnlineResponder\Test()' -Tag 'Test' {
+    BeforeAll {
+        InModuleScope -ScriptBlock {
+            Set-StrictMode -Version 1.0
+
+            $script:mockCredential = [System.Management.Automation.PSCredential]::new('Administrator', ([System.Security.SecureString]::new()))
+
+            $script:mockInstance = [AdcsOnlineResponder] @{
+                IsSingleInstance = 'Yes'
+                Credential       = $script:mockCredential
+            }
+        }
+    }
+
+    BeforeEach {
+        InModuleScope -ScriptBlock {
+            Set-StrictMode -Version 1.0
+
+            $script:getMethodCallCount = 0
+        }
+    }
+
+    Context 'When the system is in the desired state' {
+        BeforeAll {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance |
+                    # Mock method Get() which is called by the base method Test()
+                    Add-Member -Force -MemberType 'ScriptMethod' -Name 'Get' -Value {
+                        $script:getMethodCallCount += 1
+                    }
+            }
+        }
+
+        It 'Should return $true' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance.Test() | Should -BeTrue
+
+                $script:getMethodCallCount | Should -Be 1
+            }
+        }
+
+    }
+
+    Context 'When the system is not in the desired state' {
+        BeforeAll {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance |
+                    # Mock method Get() which is called by the base method Test()
+                    Add-Member -Force -MemberType 'ScriptMethod' -Name 'Get' -Value {
+                        $script:getMethodCallCount += 1
+                    }
+
+                $script:mockInstance.PropertiesNotInDesiredState = @(
+                    @{
+                        Property      = 'Ensure'
+                        ExpectedValue = 'Present'
+                        ActualValue   = 'Absent'
+                    }
+                )
+            }
+        }
+
+        It 'Should return $false' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance.Test() | Should -BeFalse
+
+                $script:getMethodCallCount | Should -Be 1
+            }
+        }
+    }
+}
+
+Describe 'AdcsOnlineResponder\GetCurrentState()' -Tag 'HiddenMember' {
+    Context 'When the OnlineResponder is not installed' {
+        BeforeAll {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance = [AdcsOnlineResponder] @{
+                    IsSingleInstance = 'Yes'
+                    Ensure           = [Ensure]::Present
+                }
+            }
+
+            Mock -CommandName Install-AdcsOnlineResponder
+        }
+
+        It 'Should return the correct values' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $currentState = $script:mockInstance.GetCurrentState(
+                    @{
+                        IsSingleInstance = 'Yes'
+                    }
+                )
+
+                $currentState.IsSingleInstance | Should -BeNullOrEmpty
+            }
+
+            Should -Invoke -CommandName Install-AdcsOnlineResponder -Exactly -Times 1 -Scope It
+        }
+    }
+
+    Context 'When the OnlineResponder is already installed' {
+        BeforeAll {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance = [AdcsOnlineResponder] @{
+                    IsSingleInstance = 'Yes'
+                    Ensure           = [Ensure]::Present
+                }
+            }
+
+            Mock -CommandName Install-AdcsOnlineResponder -MockWith {
+                throw [Microsoft.CertificateServices.Deployment.Common.OCSP.OnlineResponderSetupException]::new()
+            }
+        }
+
+        It 'Should return the correct values' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $currentState = $script:mockInstance.GetCurrentState(
+                    @{
+                        IsSingleInstance = 'Yes'
+                    }
+                )
+
+                $currentState.IsSingleInstance | Should -Be 'Yes'
+            }
+
+            Should -Invoke -CommandName Install-AdcsOnlineResponder -Exactly -Times 1 -Scope It
+        }
+    }
+
+    Context 'When the OnlineResponder throws an unexpected exception' {
+        BeforeAll {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance = [AdcsOnlineResponder] @{
+                    IsSingleInstance = 'Yes'
+                    Ensure           = [Ensure]::Present
+                }
+            }
+
+            Mock -CommandName Install-AdcsOnlineResponder -MockWith {
+                throw 'Another exception'
+            }
+        }
+
+        It 'Should return the correct values' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $errorRecord = Get-InvalidOperationRecord -Message $script:mockInstance.localizedData.ErrorGetCurrentState
+
+                {
+                    $script:mockInstance.GetCurrentState(
+                        @{
+                            IsSingleInstance = 'Yes'
+                        }
+                    )
+                } | Should -Throw -ExpectedMessage ($errorRecord.Exception.Message + '*')
+            }
+
+            Should -Invoke -CommandName Install-AdcsOnlineResponder -Exactly -Times 1 -Scope It
+        }
+    }
+}
+
+Describe 'AdcsOnlineResponder\Modify()' -Tag 'HiddenMember' {
+    Context 'When the resource should be added' {
+        BeforeAll {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance = [AdcsOnlineResponder] @{
+                    IsSingleInstance = 'Yes'
+                }
+
+                Mock -CommandName Install-AdcsOnlineResponder
+            }
+        }
+
+        It 'Should call the correct mocks' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $mockProperties = @{
+                    Ensure = [Ensure]::Present
+                }
+
+                $script:mockInstance.PropertiesNotInDesiredState = @(
+                    @{
+                        Property      = 'Ensure'
+                        ExpectedValue = 'Present'
+                        ActualValue   = 'Absent'
+                    }
+                )
+
+                { $script:mockInstance.Modify($mockProperties) } | Should -Not -Throw
+            }
+
+            Should -Invoke -CommandName Install-AdcsOnlineResponder -Exactly -Times 1 -Scope It
+        }
+    }
+
+    Context 'When the resource should be added and fails' {
+        BeforeAll {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance = [AdcsOnlineResponder] @{
+                    IsSingleInstance = 'Yes'
+                }
+
+                Mock -CommandName Install-AdcsOnlineResponder -MockWith { throw }
+            }
+        }
+
+        It 'Should call the correct mocks' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $mockProperties = @{
+                    Ensure = [Ensure]::Present
+                }
+
+                $script:mockInstance.PropertiesNotInDesiredState = @(
+                    @{
+                        Property      = 'Ensure'
+                        ExpectedValue = 'Present'
+                        ActualValue   = 'Absent'
+                    }
+                )
+
+                { $script:mockInstance.Modify($mockProperties) } | Should -Throw
+            }
+
+            Should -Invoke -CommandName Install-AdcsOnlineResponder -Exactly -Times 1 -Scope It
+        }
+    }
+
+    Context 'When the resource should be removed' {
+        BeforeAll {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance = [AdcsOnlineResponder] @{
+                    IsSingleInstance = 'Yes'
+                }
+
+                Mock -CommandName Uninstall-AdcsOnlineResponder
+            }
+        }
+
+        It 'Should call the correct mocks' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $mockProperties = @{
+                    Ensure = [Ensure]::Absent
+                }
+
+                $script:mockInstance.PropertiesNotInDesiredState = @(
+                    @{
+                        Property      = 'Ensure'
+                        ExpectedValue = 'Absent'
+                        ActualValue   = 'Present'
+                    }
+                )
+
+                { $script:mockInstance.Modify($mockProperties) } | Should -Not -Throw
+            }
+
+            Should -Invoke -CommandName Uninstall-AdcsOnlineResponder -Exactly -Times 1 -Scope It
+        }
+    }
+
+    Context 'When the resource should be removed but fails' {
+        BeforeAll {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $script:mockInstance = [AdcsOnlineResponder] @{
+                    IsSingleInstance = 'Yes'
+                }
+
+                Mock -CommandName Uninstall-AdcsOnlineResponder -MockWith { throw }
+            }
+        }
+
+        It 'Should call the correct mocks' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $mockProperties = @{
+                    Ensure = [Ensure]::Absent
+                }
+
+                $script:mockInstance.PropertiesNotInDesiredState = @(
+                    @{
+                        Property      = 'Ensure'
+                        ExpectedValue = 'Absent'
+                        ActualValue   = 'Present'
+                    }
+                )
+
+                { $script:mockInstance.Modify($mockProperties) } | Should -Throw
+            }
+
+            Should -Invoke -CommandName Uninstall-AdcsOnlineResponder -Exactly -Times 1 -Scope It
+        }
+    }
+}
+
+Describe 'AdcsOnlineResponder\AssertProperties()' -Tag 'AssertProperties' {
+    BeforeAll {
+        InModuleScope -ScriptBlock {
+            Set-StrictMode -Version 1.0
+
+            $script:mockInstance = [AdcsOnlineResponder] @{}
+        }
+    }
+
+    Context 'When required module is missing' {
+        BeforeAll {
+            Mock -CommandName Assert-Module -MockWith { throw }
+        }
+
+        It 'Should throw an error' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $mockProperties = @{
+                    IsSingleInstance = 'Yes'
+                }
+
+                { $script:mockInstance.AssertProperties($mockProperties) } | Should -Throw
+            }
+        }
+    }
+
+    Context 'When required module is present' {
+        BeforeAll {
+            Mock -CommandName Assert-Module
+        }
+
+        It 'Should not throw an error' {
+            InModuleScope -ScriptBlock {
+                Set-StrictMode -Version 1.0
+
+                $mockProperties = @{
+                    IsSingleInstance = 'Yes'
+                }
+
+                { $script:mockInstance.AssertProperties($mockProperties) } | Should -Not -Throw
+            }
+        }
+    }
+}
diff --git a/tests/Unit/DSC_AdcsOnlineResponder.Tests.ps1 b/tests/Unit/DSC_AdcsOnlineResponder.Tests.ps1
deleted file mode 100644
index 8a92e80..0000000
--- a/tests/Unit/DSC_AdcsOnlineResponder.Tests.ps1
+++ /dev/null
@@ -1,398 +0,0 @@
-<#
-    .SYNOPSIS
-        Unit test for DSC_AdcsOnlineResponder DSC resource.
-
-    .NOTES
-#>
-
-# Suppressing this rule because Script Analyzer does not understand Pester's syntax.
-[System.Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSUseDeclaredVarsMoreThanAssignments', '')]
-param ()
-
-BeforeDiscovery {
-    try
-    {
-        if (-not (Get-Module -Name 'DscResource.Test'))
-        {
-            # Assumes dependencies has been resolved, so if this module is not available, run 'noop' task.
-            if (-not (Get-Module -Name 'DscResource.Test' -ListAvailable))
-            {
-                # Redirect all streams to $null, except the error stream (stream 2)
-                & "$PSScriptRoot/../../build.ps1" -Tasks 'noop' 2>&1 4>&1 5>&1 6>&1 > $null
-            }
-
-            # If the dependencies has not been resolved, this will throw an error.
-            Import-Module -Name 'DscResource.Test' -Force -ErrorAction 'Stop'
-        }
-    }
-    catch [System.IO.FileNotFoundException]
-    {
-        throw 'DscResource.Test module dependency not found. Please run ".\build.ps1 -ResolveDependency -Tasks build" first.'
-    }
-}
-
-BeforeAll {
-    $script:dscModuleName = 'ActiveDirectoryCSDsc'
-    $script:dscResourceName = 'DSC_AdcsOnlineResponder'
-
-    $script:testEnvironment = Initialize-TestEnvironment `
-        -DSCModuleName $script:dscModuleName `
-        -DSCResourceName $script:dscResourceName `
-        -ResourceType 'Mof' `
-        -TestType 'Unit'
-
-    Import-Module -Name (Join-Path -Path $PSScriptRoot -ChildPath '..\TestHelpers\CommonTestHelper.psm1')
-    Import-Module -Name (Join-Path -Path $PSScriptRoot -ChildPath '.\Stubs\AdcsDeploymentStub.psm1')
-
-    $PSDefaultParameterValues['InModuleScope:ModuleName'] = $script:dscResourceName
-    $PSDefaultParameterValues['Mock:ModuleName'] = $script:dscResourceName
-    $PSDefaultParameterValues['Should:ModuleName'] = $script:dscResourceName
-
-    # Add Custom Type
-    if (-not ([System.Management.Automation.PSTypeName]'Microsoft.CertificateServices.Deployment.Common.OCSP.OnlineResponderSetupException').Type)
-    {
-        <#
-                Define the exception class:
-                Microsoft.CertificateServices.Deployment.Common.OCSP.OnlineResponderSetupException
-                so that unit tests can be run without ADCS being installed.
-            #>
-
-        $ExceptionDefinition = @'
-namespace Microsoft.CertificateServices.Deployment.Common.OCSP {
-    public class OnlineResponderSetupException: System.Exception {
-    }
-}
-'@
-        Add-Type -TypeDefinition $ExceptionDefinition
-    }
-
-    # Add Test Data
-    InModuleScope -ScriptBlock {
-        $DummyCredential = New-Object System.Management.Automation.PSCredential ('Administrator', (New-Object -Type SecureString))
-
-        $script:testParametersPresent = @{
-            IsSingleInstance = 'Yes'
-            Ensure           = 'Present'
-            Credential       = $DummyCredential
-            Verbose          = $false
-        }
-
-        $script:TestParametersAbsent = @{
-            IsSingleInstance = 'Yes'
-            Ensure           = 'Absent'
-            Credential       = $DummyCredential
-            Verbose          = $false
-        }
-    }
-}
-
-AfterAll {
-    $PSDefaultParameterValues.Remove('InModuleScope:ModuleName')
-    $PSDefaultParameterValues.Remove('Mock:ModuleName')
-    $PSDefaultParameterValues.Remove('Should:ModuleName')
-
-    Restore-TestEnvironment -TestEnvironment $script:testEnvironment
-
-    # Unload the module being tested so that it doesn't impact any other tests.
-    Get-Module -Name $script:dscResourceName -All | Remove-Module -Force
-
-    Remove-Module -Name AdcsDeploymentStub -Force
-
-    # Remove module common test helper.
-    Get-Module -Name 'CommonTestHelper' -All | Remove-Module -Force
-}
-
-Describe 'DSC_AdcsOnlineResponder\Get-TargetResource' -Tag 'Get' {
-    Context 'When the Online Responder is installed' {
-        BeforeAll {
-            Mock `
-                -CommandName Install-AdcsOnlineResponder `
-                -MockWith {
-                Throw (New-Object -TypeName 'Microsoft.CertificateServices.Deployment.Common.OCSP.OnlineResponderSetupException')
-            } -Verifiable
-        }
-
-
-        It 'Should return Ensure set to Present' {
-            InModuleScope -ScriptBlock {
-                Set-StrictMode -Version 1.0
-
-                $getTargetResourceResult = Get-TargetResource @testParametersPresent
-                $getTargetResourceResult.Ensure | Should -Be 'Present'
-            }
-        }
-
-        It 'Should call expected mocks' {
-            Should -InvokeVerifiable
-            Should -Invoke `
-                -CommandName Install-AdcsOnlineResponder `
-                -Exactly `
-                -Times 1 -Scope Context
-        }
-    }
-
-    Context 'When the Online Responder is not installed' {
-        BeforeAll {
-            Mock -CommandName Install-AdcsOnlineResponder
-        }
-
-
-        It 'Should return Ensure set to Absent' {
-            InModuleScope -ScriptBlock {
-                Set-StrictMode -Version 1.0
-
-                $getTargetResourceResult = Get-TargetResource @testParametersPresent
-                $getTargetResourceResult.Ensure | Should -Be 'Absent'
-            }
-        }
-
-        It 'Should call expected mocks' {
-            Should -Invoke `
-                -CommandName Install-AdcsOnlineResponder `
-                -Exactly `
-                -Times 1 -Scope Context
-        }
-    }
-
-    Context 'When there is an unexpected error' {
-        BeforeAll {
-            Mock `
-                -CommandName Install-AdcsOnlineResponder `
-                -MockWith { Throw (New-Object -TypeName 'System.Exception') } `
-                -Verifiable
-        }
-
-        It 'Should throw an exception' {
-            InModuleScope -ScriptBlock {
-                Set-StrictMode -Version 1.0
-
-                { Get-TargetResource @testParametersPresent } | Should -Throw
-            }
-        }
-
-        It 'Should call expected mocks' {
-            Should -InvokeVerifiable
-            Should -Invoke `
-                -CommandName Install-AdcsOnlineResponder `
-                -Exactly `
-                -Times 1 -Scope Context
-        }
-    }
-}
-
-Describe 'DSC_AdcsOnlineResponder\Set-TargetResource' -Tag 'Set' {
-    Context 'When the Online Responder is not installed but should be' {
-        BeforeAll {
-            Mock -CommandName Install-AdcsOnlineResponder
-            Mock -CommandName Uninstall-AdcsOnlineResponder
-        }
-
-        It 'Should not throw an exception' {
-            InModuleScope -ScriptBlock {
-                Set-StrictMode -Version 1.0
-
-                { Set-TargetResource @testParametersPresent } | Should -Not -Throw
-            }
-        }
-
-        It 'Should call expected mocks' {
-            Should -Invoke `
-                -CommandName Install-AdcsOnlineResponder `
-                -Exactly `
-                -Times 1 -Scope Context
-
-            Should -Invoke `
-                -CommandName Uninstall-AdcsOnlineResponder `
-                -Exactly `
-                -Times 0 -Scope Context
-        }
-    }
-
-    Context 'When the Online Responder is not installed but should be but an error is thrown installing it' {
-        BeforeAll {
-            Mock -CommandName Install-AdcsOnlineResponder `
-                -MockWith { [PSObject] @{ ErrorString = 'Something went wrong' } }
-
-            Mock -CommandName Uninstall-AdcsOnlineResponder
-        }
-
-        It 'Should throw an exception' {
-            InModuleScope -ScriptBlock {
-                Set-StrictMode -Version 1.0
-
-                $errorRecord = Get-InvalidOperationRecord -Message 'Something went wrong'
-
-                { Set-TargetResource @testParametersPresent } | Should -Throw $errorRecord
-            }
-        }
-
-        It 'Should call expected mocks' {
-            Should -Invoke `
-                -CommandName Install-AdcsOnlineResponder `
-                -Exactly `
-                -Times 1 -Scope Context
-
-            Should -Invoke `
-                -CommandName Uninstall-AdcsOnlineResponder `
-                -Exactly `
-                -Times 0 -Scope Context
-        }
-    }
-
-    Context 'When the Online Responder is installed but should not be' {
-        BeforeAll {
-            Mock -CommandName Install-AdcsOnlineResponder
-            Mock -CommandName Uninstall-AdcsOnlineResponder
-        }
-
-        It 'Should not throw an exception' {
-            InModuleScope -ScriptBlock {
-                Set-StrictMode -Version 1.0
-
-                { Set-TargetResource @TestParametersAbsent } | Should -Not -Throw
-            }
-        }
-
-        It 'Should call expected mocks' {
-            Should -Invoke `
-                -CommandName Install-AdcsOnlineResponder `
-                -Exactly `
-                -Times 0 -Scope Context
-
-            Should -Invoke `
-                -CommandName Uninstall-AdcsOnlineResponder `
-                -Exactly `
-                -Times 1 -Scope Context
-        }
-    }
-}
-
-Describe 'DSC_AdcsOnlineResponder\Test-TargetResource' -Tag 'Test' {
-    Context 'When the Online Responder is installed' {
-        Context 'When the Online Responder should be installed' {
-            BeforeAll {
-                Mock -CommandName Install-AdcsOnlineResponder `
-                    -MockWith { Throw (New-Object -TypeName 'Microsoft.CertificateServices.Deployment.Common.OCSP.OnlineResponderSetupException') } `
-                    -Verifiable
-            }
-
-            It 'Should return true' {
-                InModuleScope -ScriptBlock {
-                    Set-StrictMode -Version 1.0
-
-                    $testTargetResourceResult = Test-TargetResource @testParametersPresent
-                    $testTargetResourceResult | Should -BeTrue
-                }
-            }
-
-            It 'Should call expected mocks' {
-                Should -InvokeVerifiable
-                Should -Invoke `
-                    -CommandName Install-AdcsOnlineResponder `
-                    -Exactly `
-                    -Times 1 -Scope Context
-            }
-        }
-
-        Context 'When the Online Responder should not be installed' {
-            BeforeAll {
-                Mock -CommandName Install-AdcsOnlineResponder `
-                    -MockWith { Throw (New-Object -TypeName 'Microsoft.CertificateServices.Deployment.Common.OCSP.OnlineResponderSetupException') } `
-                    -Verifiable
-            }
-
-
-            It 'Should return false' {
-                InModuleScope -ScriptBlock {
-                    Set-StrictMode -Version 1.0
-
-                    $testTargetResourceResult = Test-TargetResource @TestParametersAbsent
-                    $testTargetResourceResult | Should -BeFalse
-                }
-            }
-
-            It 'Should call expected mocks' {
-                Should -InvokeVerifiable
-                Should -Invoke `
-                    -CommandName Install-AdcsOnlineResponder `
-                    -Exactly `
-                    -Times 1 -Scope Context
-            }
-        }
-    }
-
-    Context 'When the Online Responder is not installed' {
-        Context 'When the Online Responder should be installed' {
-            BeforeAll {
-                Mock -CommandName Install-AdcsOnlineResponder `
-                    -Verifiable
-            }
-
-            It 'Should return false' {
-                InModuleScope -ScriptBlock {
-                    Set-StrictMode -Version 1.0
-
-                    $testTargetResourceResult = Test-TargetResource @testParametersPresent
-                    $testTargetResourceResult | Should -BeFalse
-                }
-            }
-
-            It 'Should call expected mocks' {
-                Should -InvokeVerifiable
-                Should -Invoke `
-                    -CommandName Install-AdcsOnlineResponder `
-                    -Exactly `
-                    -Times 1 -Scope Context
-            }
-        }
-
-        Context 'When the Online Responder should not be installed' {
-            BeforeAll {
-                Mock -CommandName Install-AdcsOnlineResponder `
-                    -Verifiable
-            }
-
-
-            It 'Should return true' {
-                InModuleScope -ScriptBlock {
-                    Set-StrictMode -Version 1.0
-
-                    $testTargetResourceResult = Test-TargetResource @TestParametersAbsent
-                    $testTargetResourceResult | Should -BeTrue
-                }
-            }
-
-            It 'Should call expected mocks' {
-                Should -InvokeVerifiable
-                Should -Invoke `
-                    -CommandName Install-AdcsOnlineResponder `
-                    -Exactly `
-                    -Times 1 -Scope Context
-            }
-        }
-    }
-
-    Context 'Should throw on any other error' {
-        BeforeAll {
-            Mock -CommandName Install-AdcsOnlineResponder `
-                -MockWith { Throw (New-Object -TypeName 'System.Exception') } `
-                -Verifiable
-        }
-
-        It 'Should throw an exception' {
-            InModuleScope -ScriptBlock {
-                Set-StrictMode -Version 1.0
-
-                { Test-TargetResource @testParametersPresent } | Should -Throw
-            }
-        }
-
-        It 'Should call expected mocks' {
-            Should -InvokeVerifiable
-            Should -Invoke `
-                -CommandName Install-AdcsOnlineResponder `
-                -Exactly `
-                -Times 1 -Scope Context
-        }
-    }
-}
diff --git a/tests/Unit/Stubs/AdcsDeploymentStub.psm1 b/tests/Unit/Stubs/AdcsDeploymentStub.psm1
index f6724b5..a7ebffc 100644
--- a/tests/Unit/Stubs/AdcsDeploymentStub.psm1
+++ b/tests/Unit/Stubs/AdcsDeploymentStub.psm1
@@ -7,6 +7,15 @@
 [CmdletBinding()]
 param ()
 
+Add-Type -TypeDefinition @'
+namespace Microsoft.CertificateServices.Deployment.Common.OCSP {
+    public class OnlineResponderSetupException : System.Exception {
+        public OnlineResponderSetupException() {}
+        public OnlineResponderSetupException(string message) : base(message) {}
+    }
+}
+'@
+
 function Install-AdcsCertificationAuthority
 {
     <#