Pester Unit Test for Get-AzureBlobStorage

Question

I am trying to write a unit for a simple Azure function in Powershell

function Get-AzureBlobStorage {
    param (
        [Parameter(Mandatory)]
        [string]$ContainerName,
        [Parameter(Mandatory)]
        [string]$Blob,
        [Parameter(Mandatory)]
        $Context
    )
    try {
        return (Get-AzStorageBlob -Container $ContainerName -Context $Context -Blob $Blob)
    }
    catch {
        Write-Error "Blobs in Container [$ContainerName] not found"

    }

Unit test

   Context 'Get-AzureBlobStorage' {
        It 'Should be able to get details to Blob Storage account without any errors' {
                $ContainerName = 'test'
                $Blob="test-rg"
                $Context = "test"
                Mock Get-AzStorageBlob { } -ModuleName $moduleName
                Get-AzureBlobStorage -ContainerName $ContainerName -Blob $Blob -Context $Context -ErrorAction SilentlyContinue -ErrorVariable errors
                $errors.Count | Should -Be 0
            }
}

But i was not able to get it to work. I am getting ht following error,

Cannot process argument transformation on parameter 'Context'. Cannot convert the "test" value of type "System.String" to type "Microsoft.Azure.Commands.Common.Authentication.Abstractions.IStorageContext". 

My question is how to get such values as context. I have several other functions where one of the parameters is always some complex object. What is the best way to write unit test for such functions