Composite resources fail the common tests

[johlju]

If a resource module contain a composite resources the common tests fail, because the dependent resource modules are not in any of the PowerShell module paths.

This is currently failing in xMySql.

Describing Common Tests - .psm1 File Parsing

Context DscResources\xMySqlProvision\xMySqlProvision.Schema.psm1

There are parse errors in C:\projects\xmysql\DscResources\xMySqlProvision\xMySqlProvision.Schema.psm1:
Extent          : xMySqlServer
ErrorId         : ResourceNotDefined
Message         : Undefined DSC resource 'xMySqlServer'. Use Import-DSCResource to import the resource.
IncompleteInput : False
Extent          : xMySqlDatabase
ErrorId         : ResourceNotDefined
Message         : Undefined DSC resource 'xMySqlDatabase'. Use Import-DSCResource to import the resource.
IncompleteInput : False
Extent          : xMySqlUser
ErrorId         : ResourceNotDefined
Message         : Undefined DSC resource 'xMySqlUser'. Use Import-DSCResource to import the resource.
IncompleteInput : False
Extent          : xMySqlGrant
ErrorId         : ResourceNotDefined
Message         : Undefined DSC resource 'xMySqlGrant'. Use Import-DSCResource to import the resource.
IncompleteInput : False

      [-] Module file 'DscResources\xMySqlProvision\xMySqlProvision.Schema.psm1' should not contain parse errors 42ms
        Expected $false, but got $true.
        248:                 $containsParseErrors | Should Be $false
        at Invoke-LegacyAssertion, C:\Program Files\WindowsPowerShell\Modules\Pester\4.3.1\Functions\Assertions\Should.ps1: line 188
        at <ScriptBlock>, C:\projects\xmysql\DscResource.Tests\Meta.Tests.ps1: line 248