Update AddonStorageBackend documentation

doc/AddonStorageBackend.md

@@ -17,22 +17,23 @@ namespace Friendica\Model\Storage;
 ```php
 interface IStorage
 {
-	public static function get($ref);
-	public static function put($data, $ref = "");
-	public static function delete($ref);
-	public static function getOptions();
-	public static function saveOptions($data);
+	public function get(string $reference);
+	public function put(string $data, string $reference = '');
+	public function delete(string $reference);
+	public function getOptions();
+	public function saveOptions(array $data);
+	public function __toString();
 }
 ```
 
-- `get($ref)` returns data pointed by `$ref`
-- `put($data, $ref)` saves data in `$data` to position `$ref`, or a new position if `$ref` is empty.
-- `delete($ref)` delete data pointed by `$ref`
+- `get(string $reference)` returns data pointed by `$reference`
+- `put(string $data, string $reference)` saves data in `$data` to position `$reference`, or a new position if `$reference` is empty.
+- `delete(string $reference)` delete data pointed by `$reference`
 
 Each storage backend can have options the admin can set in admin page.
 
 - `getOptions()` returns an array with details about each option to build the interface.
-- `saveOptions($data)` get `$data` from admin page, validate it and save it.
+- `saveOptions(array $data)` get `$data` from admin page, validate it and save it.
 
 The array returned by `getOptions()` is defined as:
 
@@ -84,11 +85,33 @@ See doxygen documentation of `IStorage` interface for details about each method.
 
 Each backend must be registered in the system when the plugin is installed, to be aviable.
 
-`Friendica\Core\StorageManager::register($name, $class)` is used to register the backend class.
+`DI::facStorage()->register(string $name, string $class)` is used to register the backend class.
 The `$name` must be univocal and will be shown to admin.
 
 When the plugin is uninstalled, registered backends must be unregistered using
-`Friendica\Core\StorageManager::unregister($class)`.
+`DI::facStorage()->unregister(string $name)`.
+
+## Adding tests
+
+**Currently testing is limited to core Friendica only, this shows theoretically how tests should work in the future**
+
+Each new Storage class should be added to the test-environment at [Storage Tests](https://github.com/friendica/friendica/tree/develop/tests/src/Model/Storage/).
+
+Add a new test class which's naming convention is `StorageClassTest`, which extend the `StorageTest` in the same directory.
+
+Override the two necessary instances:
+```php
+use Friendica\Model\Storage\IStorage;
+
+abstract class StorageTest 
+{
+	// returns an instance of your newly created storage class
+	abstract protected function getInstance();
+
+	// Assertion for the option array you return for your new StorageClass
+	abstract protected function assertOption(IStorage $storage);
+} 
+```
 
 ## Example
 
@@ -112,60 +135,86 @@ use Friendica\Core\L10n;
 
 class SampleStorageBackend implements IStorage
 {
-	public static function get($ref)
+	const NAME = 'Sample Storage';
+
+	/** @var Config\IConfiguration */
+	private $config;
+	/** @var L10n\L10n */
+	private $l10n;
+
+	/**
+	  * SampleStorageBackend constructor.
+	  * @param Config\IConfiguration $config 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(Config\IConfiguration $config, L10n\L10n $l10n) 
 	{
-		// we return alwais the same image data. Which file we load is defined by
+		$this->config = $config;
+		$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
-		$filename = Config::get("storage", "samplestorage", "sample.jpg");
+		$filename = $this->config->get('storage', 'samplestorage', 'sample.jpg');
 		return file_get_contents($filename);
 	}
 	
-	public static function put($data, $ref = "")
+	public function put(string $data, string $reference = '')
 	{
-		if ($ref === "") {
-			$ref = "sample";
+		if ($reference === '') {
+			$reference = 'sample';
 		}
 		// we don't save $data !
-		return $ref;
+		return $reference;
 	}
 	
-	public static function delete($ref)
+	public function delete(string $reference)
 	{
 		// we pretend to delete the data
 		return true;
 	}
 	
-	public static function getOptions()
+	public function getOptions()
 	{
-		$filename = Config::get("storage", "samplestorage", "sample.jpg");
+		$filename = $this->config->get('storage', 'samplestorage', 'sample.jpg');
 		return [
-			"filename" => [
-				"input",	// will use a simple text input
-				L10n::t("The file to return"),	// the label
+			'filename' => [
+				'input',	// will use a simple text input
+				$this->l10n->t('The file to return'),	// the label
 				$filename,	// the current value
-				L10n::t("Enter the path to a file"), // the help text
-				// no extra data for "input" type..
+				$this->l10n->t('Enter the path to a file'), // the help text
+				// no extra data for 'input' type..
+			],
 		];
 	}
 	
-	public static function saveOptions($data)
+	public function saveOptions(array $data)
 	{
 		// the keys in $data are the same keys we defined in getOptions()
-		$newfilename = trim($data["filename"]);
+		$newfilename = trim($data['filename']);
 		
 		// this function should always validate the data.
 		// in this example we check if file exists
 		if (!file_exists($newfilename)) {
 			// in case of error we return an array with
-			// ["optionname" => "error message"]
-			return ["filename" => "The file doesn't exists"];
+			// ['optionname' => 'error message']
+			return ['filename' => 'The file doesn\'t exists'];
 		}
 		
-		Config::set("storage", "samplestorage", $newfilename);
+		$this->config->set('storage', 'samplestorage', $newfilename);
 		
 		// no errors, return empty array
 		return [];
 	}
+
+	public function __toString()
+	{
+		return self::NAME;
+	}
 }
 ```
 
@@ -200,5 +249,33 @@ function samplestorage_unistall()
 }
 ```
 
+**Theoretically - until tests for Addons are enabled too - create a test class with the name `addon/tests/SampleStorageTest.php`:
 
+```php
+use Friendica\Model\Storage\IStorage;
+use Friendica\Test\src\Model\Storage\StorageTest;
 
+class SampleStorageTest extends StorageTest 
+{
+	// returns an instance of your newly created storage class
+	protected function getInstance()
+	{
+		// create a new SampleStorageBackend instance with all it's dependencies
+		// Have a look at DatabaseStorageTest or FilesystemStorageTest for further insights
+		return new SampleStorageBackend();
+	}
+
+	// Assertion for the option array you return for your new StorageClass
+	protected function assertOption(IStorage $storage)
+	{
+		$this->assertEquals([
+			'filename' => [
+				'input',
+				'The file to return',
+				'sample.jpg',
+				'Enter the path to a file'
+			],
+		], $storage->getOptions());
+	}
+} 
+```