Add test for icon arrays in Following table

Add unit test to verify that actors with icon objects containing
arrays of URLs are handled correctly by the Following table.
Currently this test will fail as the object_to_uri function doesn't
fully process nested arrays in Image objects.

Author: obenland

tests/includes/wp-admin/table/class-test-following.php

@@ -105,4 +105,60 @@ function ( $value, $actor ) use ( $actor_url, $actor_data ) {
 		\remove_all_filters( 'pre_get_remote_metadata_by_actor' );
 		wp_delete_post( $actor_post_id, true );
 	}
+
+	/**
+	 * Test prepare_items with actor having icon array of URLs.
+	 *
+	 * This test verifies that when an icon field contains an array of URLs,
+	 * the object_to_uri() function correctly extracts the first URL from the array.
+	 *
+	 * @covers ::prepare_items
+	 */
+	public function test_prepare_items_with_icon_array_of_urls() {
+		// Mock remote metadata for the actor with icon as direct array of URLs.
+		$actor_url  = 'https://example.com/users/arrayuser';
+		$actor_data = array(
+			'name'              => 'Array User',
+			'icon'              => array(
+				'url'       => array(
+					'https://example.com/storage/profile.webp',
+				),
+				'type'      => 'Image',
+				'mediaType' => 'image/webp',
+			),
+			'url'               => $actor_url,
+			'id'                => 'https://example.com/users/arrayuser',
+			'preferredUsername' => 'arrayuser',
+			'inbox'             => 'https://example.com/users/arrayuser/inbox',
+		);
+
+		// Mock the remote metadata call using the correct filter.
+		add_filter(
+			'pre_get_remote_metadata_by_actor',
+			function ( $value, $actor ) use ( $actor_url, $actor_data ) {
+				if ( $actor === $actor_url ) {
+					return $actor_data;
+				}
+				return $value;
+			},
+			10,
+			2
+		);
+
+		// Add the actor first, then follow them.
+		$actor_post_id = Actors::upsert( $actor_data );
+
+		// Follow the actor using the proper method.
+		Following_Collection::follow( $actor_post_id, get_current_user_id() );
+
+		// Use the real prepare_items() method.
+		$this->following_table->prepare_items();
+
+		// Verify that the icon array was processed correctly: from array to first URL.
+		$this->assertEquals( 'https://example.com/storage/profile.webp', $this->following_table->items[0]['icon'] );
+
+		// Clean up.
+		\remove_all_filters( 'pre_get_remote_metadata_by_actor' );
+		wp_delete_post( $actor_post_id, true );
+	}
 }