Fix test password generation rule to meet Windows complexity requirements (#10143)

test/powershell/Modules/Microsoft.PowerShell.Management/Set-Service.Tests.ps1

@@ -10,8 +10,7 @@ Describe "Set/New/Remove-Service cmdlet tests" -Tags "Feature", "RequireAdminOnW
         }
         if ($IsWindows) {
             $userName = "testuserservices"
-            $Password = ([char[]]([char]33..[char]95) + ([char[]]([char]97..[char]126)) + 0..9 | Sort-Object {Get-Random})[0..12] -join ''
-            $testPass = (New-Object -TypeName Net.NetworkCredential("", $Password)).SecurePassword
+            $testPass = [Net.NetworkCredential]::new("", (New-ComplexPassword)).SecurePassword
             $creds    = [pscredential]::new(".\$userName", $testPass)
             $SecurityDescriptorSddl = 'D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;SU)'
             $WrongSecurityDescriptorSddl = 'D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BB)(A;;CCLCSWLOCRRC;;;SU)'

test/tools/Modules/HelpersCommon/HelpersCommon.psd1

@@ -23,6 +23,7 @@ FunctionsToExport = @(
         'Enable-Testhook'
         'Get-RandomFileName'
         'New-RandomHexString'
+        'New-ComplexPassword'
         'Send-VstsLogFile'
         'Set-TesthookResult'
         'Start-NativeExecution'

test/tools/Modules/HelpersCommon/HelpersCommon.psm1

@@ -344,3 +344,22 @@ function Test-CanWriteToPsHome
 
     $script:CanWriteToPsHome
 }
+
+# Creates a password meeting Windows complexity rules
+function New-ComplexPassword
+{
+    $numbers = "0123456789"
+    $lowercase = "abcdefghijklmnopqrstuvwxyz"
+    $uppercase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+    $symbols = "~!@#$%^&*_-+=``|\(){}[]:;`"'<>,.?/"
+    $password = [string]::Empty
+    # Windows password complexity rule requires minimum 8 characters and using at least 3 of the
+    # buckets above, so we just pick one from each bucket twice.
+    # https://docs.microsoft.com/en-us/windows/security/threat-protection/security-policy-settings/password-must-meet-complexity-requirements
+    1..2 | ForEach-Object {
+        $Password += $numbers[(Get-Random $numbers.Length)] + $lowercase[(Get-Random $lowercase.Length)] +
+            $uppercase[(Get-Random $uppercase.Length)] + $symbols[(Get-Random $symbols.Length)]
+    }
+
+    $password
+}