Added pester test to validate -All parameter on delta functions

Author: timayabi2020

src/Users/Users/test/v1.0/Get-MgUserDelta.Tests.ps1

@@ -0,0 +1,13 @@
+BeforeAll {
+    $loadEnvPath = Join-Path $PSScriptRoot 'loadEnv.ps1'
+    if (-Not (Test-Path -Path $loadEnvPath)) {
+        $loadEnvPath = Join-Path $PSScriptRoot '..\loadEnv.ps1'
+    }
+}
+
+
+Describe 'Check Delta' {
+    It 'ShouldNotThrowExceptionWhenAllParameterIsSpecified' {
+        { Get-MgUserDelta -All } | Should -Not -Throw
+    }
+}