SqlTraceflag: Correctly loads the SMO assemblies

CHANGELOG.md

@@ -5,6 +5,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- SqlTraceFlag
+  - Fixed Assembly not loaded error
+   ([issue #1680](https://github.com/dsccommunity/SqlServerDsc/issues/1680)).
+
 ### Changed
 
 - SqlLogin

source/DSCResources/DSC_SqlTraceFlag/DSC_SqlTraceFlag.psm1

@@ -33,6 +33,9 @@ function Get-TargetResource
         $InstanceName
     )
 
+    # Import SqlServer module.
+    Import-SQLPSModule
+
     Write-Verbose -Message (
         $script:localizedData.GetConfiguration -f $InstanceName
     )
@@ -145,6 +148,9 @@ function Set-TargetResource
         $RestartTimeout = 120
     )
 
+    # Import SqlServer module.
+    Import-SQLPSModule
+
     Write-Verbose -Message (
         $script:localizedData.SetConfiguration -f $InstanceName
     )

tests/Unit/DSC_SqlTraceFlag.Tests.ps1

@@ -167,6 +167,7 @@ Server\MSSQL15.INST00\MSSQL\DATA\mastlog.ldf
                     return @($mockServerObject)
                 }
                 Mock -CommandName New-Object -MockWith $mockSmoWmiManagedComputer -ParameterFilter $mockNewObject_ParameterFilter_RealServerName -Verifiable
+                Mock -CommandName Import-SQLPSModule -MockWith {return}
             }
 
             Context 'For the default instance' {
@@ -353,6 +354,7 @@ Server\MSSQL15.INST00\MSSQL\DATA\mastlog.ldf
                     return @($mockServerObject)
                 }
                 Mock -CommandName New-Object -MockWith $mockSmoWmiManagedComputer -Verifiable
+                Mock -CommandName Import-SQLPSModule -MockWith {return}
             }
 
             Context 'When the system is not in the desired state and TraceFlags is empty' {