Fix BaseApi and corresponding tests

tests/Util/AppDouble.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Friendica\Test\Util;
+
+use Friendica\App;
+
+/**
+ * Making the App class overridable for specific situations
+ *
+ * @see App
+ */
+class AppDouble extends App
+{
+	/** @var bool Marks/Overwrites if the user is currently logged in */
+	protected $isLoggedIn = false;
+
+	/**
+	 * Manually overwrite the "isLoggedIn" behavior
+	 *
+	 * @param bool $isLoggedIn
+	 */
+	public function setIsLoggedIn(bool $isLoggedIn)
+	{
+		$this->isLoggedIn = $isLoggedIn;
+	}
+
+	public function isLoggedIn()
+	{
+		return $this->isLoggedIn;
+	}
+}