diff --git a/windows/collector/Test-SmInput.ps1 b/windows/collector/Test-SmInput.ps1
new file mode 100644
index 0000000..a464f25
--- /dev/null
+++ b/windows/collector/Test-SmInput.ps1
@@ -0,0 +1,36 @@
+#Requires -Version 5.1
+# Pure validation helpers for the WinPE collector. No WinForms dependency so they
+# are unit-testable headless. Each returns [pscustomobject]@{ Ok=[bool]; Message=[string] }.
+
+function New-SmResult([bool]$ok, [string]$msg = '') { [pscustomobject]@{ Ok = $ok; Message = $msg } }
+
+$script:SmReserved = @('administrator','guest','system','defaultaccount','wdagutilityaccount','sm-bootstrap')
+
+function Test-SmUsername([string]$name) {
+    if ([string]::IsNullOrWhiteSpace($name)) { return New-SmResult $false 'Username is required.' }
+    if ($name.Length -gt 20)                 { return New-SmResult $false 'Username must be 20 characters or fewer.' }
+    if ($script:SmReserved -contains $name.ToLower()) { return New-SmResult $false 'That username is reserved.' }
+    if ($name -notmatch '^[A-Za-z0-9][A-Za-z0-9 ._-]*$') { return New-SmResult $false 'Username has illegal characters.' }
+    New-SmResult $true
+}
+
+function Test-SmPassword([string]$pw, [string]$confirm) {
+    if ([string]::IsNullOrEmpty($pw))   { return New-SmResult $false 'Password is required.' }
+    if ($pw.Length -lt 8)               { return New-SmResult $false 'Password must be at least 8 characters.' }
+    if ($pw -ne $confirm)               { return New-SmResult $false 'Passwords do not match.' }
+    New-SmResult $true
+}
+
+function Test-SmPin([string]$pin, [string]$confirm) {
+    if ($pin -notmatch '^[0-9]+$')      { return New-SmResult $false 'PIN must be numeric.' }
+    if ($pin.Length -lt 6)              { return New-SmResult $false 'PIN must be at least 6 digits.' }
+    if ($pin -ne $confirm)              { return New-SmResult $false 'PINs do not match.' }
+    New-SmResult $true
+}
+
+function Test-SmComputerName([string]$name) {
+    if ([string]::IsNullOrWhiteSpace($name)) { return New-SmResult $false 'Computer name is required.' }
+    if ($name.Length -gt 15)                 { return New-SmResult $false 'Computer name must be 15 characters or fewer.' }
+    if ($name -notmatch '^[A-Za-z0-9-]+$')   { return New-SmResult $false 'Computer name: letters, digits, hyphens only.' }
+    New-SmResult $true
+}
diff --git a/windows/tests/Collector.Tests.ps1 b/windows/tests/Collector.Tests.ps1
new file mode 100644
index 0000000..8a84196
--- /dev/null
+++ b/windows/tests/Collector.Tests.ps1
@@ -0,0 +1,32 @@
+#Requires -Version 5.1
+BeforeAll {
+    . (Join-Path $PSScriptRoot '..\collector\Test-SmInput.ps1')
+}
+
+Describe 'Test-SmUsername' {
+    It 'accepts a simple username'          { (Test-SmUsername 'jamie').Ok | Should -BeTrue }
+    It 'rejects empty'                       { (Test-SmUsername '').Ok      | Should -BeFalse }
+    It 'rejects reserved name'               { (Test-SmUsername 'Administrator').Ok | Should -BeFalse }
+    It 'rejects illegal chars'               { (Test-SmUsername 'a\b').Ok   | Should -BeFalse }
+    It 'rejects > 20 chars'                  { (Test-SmUsername ('x'*21)).Ok| Should -BeFalse }
+}
+
+Describe 'Test-SmPassword' {
+    It 'accepts matching 8+ char password'   { (Test-SmPassword 'Sup3rPass!' 'Sup3rPass!').Ok | Should -BeTrue }
+    It 'rejects mismatch'                     { (Test-SmPassword 'a' 'b').Ok | Should -BeFalse }
+    It 'rejects < 8 chars'                    { (Test-SmPassword 'short' 'short').Ok | Should -BeFalse }
+}
+
+Describe 'Test-SmPin' {
+    It 'accepts 6-digit matching pin'        { (Test-SmPin '246810' '246810').Ok | Should -BeTrue }
+    It 'rejects < 6 digits'                   { (Test-SmPin '123' '123').Ok | Should -BeFalse }
+    It 'rejects non-numeric'                  { (Test-SmPin 'abcdef' 'abcdef').Ok | Should -BeFalse }
+    It 'rejects mismatch'                     { (Test-SmPin '246810' '999999').Ok | Should -BeFalse }
+}
+
+Describe 'Test-SmComputerName' {
+    It 'accepts a valid name'                { (Test-SmComputerName 'SILVER-01').Ok | Should -BeTrue }
+    It 'rejects empty'                        { (Test-SmComputerName '').Ok | Should -BeFalse }
+    It 'rejects > 15 chars'                   { (Test-SmComputerName ('A'*16)).Ok | Should -BeFalse }
+    It 'rejects illegal chars'                { (Test-SmComputerName 'bad name').Ok | Should -BeFalse }
+}