test: add mock for language API in acceptance tests

bin/behat.sh

@@ -46,10 +46,11 @@ sleep 5
 
 php -S "$WORDPRESS_URL" -t "$WORDPRESS_PATH" >/dev/null 2>&1 &
 
-ln -s $PLUGIN_PATH $WORDPRESS_PATH/wp-content/plugins/antispam-bee
-ln -s $PLUGIN_PATH/tests/Acceptance/Behat/env/mu-plugins/ $WORDPRESS_PATH/wp-content/mu-plugins
+ln -s "$PLUGIN_PATH" "$WORDPRESS_PATH/wp-content/plugins/antispam-bee"
+ln -s "$PLUGIN_PATH/tests/Acceptance/Behat/env/mu-plugins/" "$WORDPRESS_PATH/wp-content/mu-plugins"
 
-ls $WORDPRESS_PATH/wp-content/plugins
+ls "$WORDPRESS_PATH/wp-content/mu-plugins"
+ls "$WORDPRESS_PATH/wp-content/plugins/"
 
 vendor/bin/wp --path=$WORDPRESS_PATH plugin activate antispam-bee
 vendor/bin/wp --path=$WORDPRESS_PATH theme activate twentynineteen

tests/Acceptance/Behat/env/mu-plugins/mock-language-api.php

@@ -0,0 +1,24 @@
+<?php
+/**
+ * Plugin Name: Mock Language API
+ */
+
+add_filter(
+	'antispam_bee_detected_lang',
+	function( $detected_lang, $comment_text ) {
+		if ( ! empty( $comment_text ) && strlen( $comment_text ) >= 50 ) {
+			// Only operate on strings above 50 characters.
+			if (strpos($comment_text, 'English') !== false) {
+				// We can only detect English.
+				return 'en';
+			} else {
+				// Not "null", so we don't continue querying the real API.
+				return 'xx';
+			}
+		} else {
+			return null;
+        }
+	},
+	10,
+	2
+);