Add dedicated commands for checking software

scripts/Windows/Scripts/SoftwareManagement.ps1

@@ -25,3 +25,34 @@ function Install-SoftwarePackage([Context] $context, [string] $location, [string
         Remove-Item -Recurse $tempDir;
     }
 }
+
+<#
+    .SYNOPSIS
+    Checks whether the specified package has been installed using Chocolatey.
+
+    .PARAMETER Name
+    The name of the package to check.
+#>
+function Test-ChocoPackage {
+    [OutputType([bool])]
+    param(
+        [string] $Name
+    );
+
+    -not [string]::IsNullOrEmpty((choco list --limit-output --exact $name));
+}
+
+<#
+    .SYNOPSIS
+    Checks whether a command with the specified name exists.
+
+    .PARAMETER Name
+    The name of the command to check.
+#>
+function Test-Command {
+    param (
+        [string] $Name
+    )
+
+    [bool] (Get-Command $Name -ErrorAction SilentlyContinue);
+}