revert updates to existing whatif tests

Author: tgauth

dsc/tests/dsc_whatif.tests.ps1

@@ -38,10 +38,10 @@ Describe 'whatif tests' {
         $what_if_result = $config_yaml | dsc config set -w | ConvertFrom-Json
         $set_result = $config_yaml | dsc config set | ConvertFrom-Json
         $what_if_result.metadata.'Microsoft.DSC'.executionType | Should -BeExactly 'WhatIf'
-        $what_if_result.results.result.beforeState._exist | Should -Be $false
+        $what_if_result.results.result.beforeState._exist | Should -Be $set_result.results.result.beforeState._exist
         $what_if_result.results.result.beforeState.keyPath | Should -Be $set_result.results.result.beforeState.keyPath
         $what_if_result.results.result.afterState.KeyPath | Should -Be $set_result.results.result.afterState.keyPath
-        $what_if_result.results.result.changedProperties | Should -Be @('_exist')
+        $what_if_result.results.result.changedProperties | Should -Be $set_result.results.result.changedProperties
         $what_if_result.hadErrors | Should -BeFalse
         $what_if_result.results.Count | Should -Be 1
         $LASTEXITCODE | Should -Be 0