Test initial check in

Tests/ConvertTo-IPv4.Tests.ps1

@@ -0,0 +1,38 @@
+$ModuleName = 'IPv4Toolbox'
+$script:FunctionName = 'ConvertTo-IPv4'
+$ParentPath = Split-Path -Path $PSScriptRoot -Parent
+$ModulePath = Join-Path -Path $ParentPath -ChildPath "$($ModuleName).psm1"
+Get-Module -Name $ModuleName |
+  Remove-Module -Force
+Import-Module $ModulePath -Force
+
+InModuleScope $ModuleName {
+  Describe 'ConvertTo-IPv4 Tests' {
+    Context "Basic function unit tests for $FunctionName" -Tags @('Build', 'Unit') {
+      It 'Converts 3232235777 to the correct IPv4 representation' {
+        $Integer = 3232235777
+        $Result = ConvertTo-IPv4 -Integer $Integer
+        $ExpectedResult = '192.168.1.1'
+        $Result | Should -Be $ExpectedResult
+      }
+
+      It 'Converts 2130706433 to the correct IPv4 representation' {
+        $Integer = 2130706433
+        $Result = ConvertTo-IPv4 -Integer $Integer
+        $ExpectedResult = '127.0.0.1'
+        $Result | Should -Be $ExpectedResult
+      }
+
+      It 'Converts 4294967295 to the correct IPv4 representation' {
+        $Integer = 4294967295
+        $Result = ConvertTo-IPv4 -Integer $Integer
+        $ExpectedResult = '255.255.255.255'
+        $Result | Should -Be $ExpectedResult
+      }
+
+      It 'throws an error for invalid input type' {
+        { ConvertTo-IPv4 -Integer 'NotAnInteger' } | Should -Throw -ExpectedMessage '*Cannot process argument transformation on parameter ''Integer''. Cannot convert value "NotAnInteger" to type "System.Int64". Error: "The input string ''NotAnInteger'' was not in a correct format."*'
+      }
+    }
+  }
+}