- Fixing SystemResource

- Adding tests for StorageManager
- Updating doc

tests/Util/SampleStorageBackend.php

@@ -0,0 +1,94 @@
+<?php
+
+namespace Friendica\Test\Util;
+
+use Friendica\Model\Storage\IStorage;
+
+use Friendica\Core\L10n\L10n;
+
+/**
+ * A backend storage example class
+ */
+class SampleStorageBackend implements IStorage
+{
+	const NAME = 'Sample Storage';
+
+	/** @var L10n */
+	private $l10n;
+
+	/** @var array */
+	private $options = [
+		'filename' => [
+			'input',    // will use a simple text input
+			'The file to return',    // the label
+			'sample',    // the current value
+			'Enter the path to a file', // the help text
+			// no extra data for 'input' type..
+		],
+	];
+	/** @var array Just save the data in memory */
+	private $data = [];
+
+	/**
+	 * SampleStorageBackend constructor.
+	 *
+	 * @param L10n $l10n The configuration of Friendica
+	 *
+	 * You can add here every dynamic class as dependency you like and add them to a private field
+	 * Friendica automatically creates these classes and passes them as argument to the constructor
+	 */
+	public function __construct(L10n $l10n)
+	{
+		$this->l10n = $l10n;
+	}
+
+	public function get(string $reference)
+	{
+		// we return always the same image data. Which file we load is defined by
+		// a config key
+		return $this->data[$reference] ?? null;
+	}
+
+	public function put(string $data, string $reference = '')
+	{
+		if ($reference === '') {
+			$reference = 'sample';
+		}
+
+		$this->data[$reference] = $data;
+
+		return $reference;
+	}
+
+	public function delete(string $reference)
+	{
+		if (isset($this->data[$reference])) {
+			unset($this->data[$reference]);
+		}
+
+		return true;
+	}
+
+	public function getOptions()
+	{
+		return $this->options;
+	}
+
+	public function saveOptions(array $data)
+	{
+		$this->options = $data;
+
+		// no errors, return empty array
+		return $this->options;
+	}
+
+	public function __toString()
+	{
+		return self::NAME;
+	}
+
+	public static function getName()
+	{
+		return self::NAME;
+	}
+}