From 379407a640f68c9abf10e1da88c8687826d45be0 Mon Sep 17 00:00:00 2001
From: Kunal Mehta <legoktm@member.fsf.org>
Date: Sun, 19 Aug 2018 21:46:21 -0700
Subject: [PATCH] Support a heading of '0' in Html::messageBox()

Change-Id: I181cb6f92ab1b10d87b1213a043a5f291149d094
---
 includes/Html.php                   | 2 +-
 tests/phpunit/includes/HtmlTest.php | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/includes/Html.php b/includes/Html.php
index 32375c1f57..dba4c67a72 100644
--- a/includes/Html.php
+++ b/includes/Html.php
@@ -704,7 +704,7 @@ class Html {
 	 * @return string of HTML representing a box.
 	 */
 	private static function messageBox( $html, $className, $heading = '' ) {
-		if ( $heading ) {
+		if ( $heading !== '' ) {
 			$html = self::element( 'h2', [], $heading ) . $html;
 		}
 		return self::rawElement( 'div', [ 'class' => $className ], $html );
diff --git a/tests/phpunit/includes/HtmlTest.php b/tests/phpunit/includes/HtmlTest.php
index dc32a6fff3..070a02936f 100644
--- a/tests/phpunit/includes/HtmlTest.php
+++ b/tests/phpunit/includes/HtmlTest.php
@@ -476,6 +476,10 @@ class HtmlTest extends MediaWikiTestCase {
 			Html::errorBox( 'err', 'heading' ),
 			'<div class="errorbox"><h2>heading</h2>err</div>'
 		);
+		$this->assertEquals(
+			Html::errorBox( 'err', '0' ),
+			'<div class="errorbox"><h2>0</h2>err</div>'
+		);
 	}
 
 	/**
-- 
2.20.1