Implemented SourceMembershipInformation and tests

application/src/Domain/SourceManagement/SourceMembershipInformation.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Domain\SourceManagement;
+
+use Doctrine\Common\Collections\Collection;
+use App\Entity\Source\SourceInterface;
+use Doctrine\Common\Collections\ArrayCollection;
+
+class SourceMembershipInformation implements SourceMembershipInformationInterface
+{
+    /**
+     * @var SourceInterface
+     */
+    private $source;
+
+    /**
+     * @var Collection
+     */
+    private $memberships;
+
+    public function __construct(SourceInterface $source)
+    {
+        $this->source = $source;
+    }
+
+    private function itterateOverMemberships(Collection $memberships): void
+    {
+        /**
+         * @var SourceInterface
+         */
+        foreach ($memberships as $membership) {
+            if (!$this->memberships->contains($membership)) {
+                $this->memberships->add($membership);
+                $this->itterateOverMemberships($membership->getMemberships());
+            }
+        }
+    }
+
+    public function getAllMemberships(): Collection
+    {
+        $this->memberships = new ArrayCollection();
+        $this->itterateOverMemberships($this->source->getMemberships());
+
+        return $this->memberships;
+    }
+}

application/src/Domain/SourceManagement/SourceMembershipInformationInterface.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Domain\SourceManagement;
+
+use Doctrine\Common\Collections\Collection;
+
+interface SourceMembershipInformationInterface
+{
+    public function getAllMemberships(): Collection;
+}