--- /dev/null
+<?php
+
+use Message;
+use MessageLocalizer;
+use MessageSpecifier;
+
+/**
+ * A simple {@link MessageLocalizer} implementation for use in tests.
+ * By default, it sets the message language to 'qqx',
+ * to make the tests independent of the wiki configuration.
+ *
+ * @author Lucas Werkmeister
+ * @license GPL-2.0-or-later
+ */
+class MockMessageLocalizer implements MessageLocalizer {
+
+ /**
+ * @var string|null
+ */
+ private $languageCode;
+
+ /**
+ * @param string|null $languageCode The language code to use for messages by default.
+ * You can specify null to use the user language,
+ * but this is not recommended as it may make your tests depend on the wiki configuration.
+ */
+ public function __construct( $languageCode = 'qqx' ) {
+ $this->languageCode = $languageCode;
+ }
+
+ /**
+ * Get a Message object.
+ * Parameters are the same as {@link wfMessage()}.
+ *
+ * @param string|string[]|MessageSpecifier $key Message key, or array of keys,
+ * or a MessageSpecifier.
+ * @param mixed $args,...
+ * @return Message
+ */
+ public function msg( $key ) {
+ $args = func_get_args();
+
+ /** @var Message $message */
+ $message = call_user_func_array( 'wfMessage', $args );
+
+ if ( $this->languageCode !== null ) {
+ $message->inLanguage( $this->languageCode );
+ }
+
+ return $message;
+ }
+
+}