Add test function for add type

doc/31-Changelog.md

@@ -11,6 +11,8 @@ Released closed milestones can be found on [GitHub](https://github.com/Icinga/ic
 
 [Issue and PRs](https://github.com/Icinga/icinga-powershell-framework/milestone/15?closed=1)
 
+* [#305](https://github.com/Icinga/icinga-powershell-framework/pull/305) Adds a new Cmdlet to test if functions with `Add-Type` are already present inside the current scope of the shell
+
 ## 1.5.2 (2021-07-09)
 
 ### Security Fixes

lib/core/tools/Test-IcingaAddTypeExist.psm1

@@ -0,0 +1,18 @@
+function Test-IcingaAddTypeExist()
+{
+    param (
+        [string]$Type = $null
+    );
+
+    if ([string]::IsNullOrEmpty($Type)) {
+        return $FALSE;
+    }
+
+    foreach ($entry in [System.AppDomain]::CurrentDomain.GetAssemblies()) {
+        if ($entry.GetTypes() -Match $Type) {
+            return $TRUE;
+        }
+    }
+
+    return $FALSE;
+}