1 files changed, 38 insertions, 0 deletions
diff --git a/tests/phpunit/includes/deferred/DeferredUpdatesTest.php b/tests/phpunit/includes/deferred/DeferredUpdatesTest.php
new file mode 100644
index 00000000..5348c854
--- /dev/null
+++ b/tests/phpunit/includes/deferred/DeferredUpdatesTest.php
@@ -0,0 +1,38 @@
+<?php
+
+class DeferredUpdatesTest extends MediaWikiTestCase {
+
+	public function testDoUpdates() {
+		$updates = array(
+			'1' => 'deferred update 1',
+			'2' => 'deferred update 2',
+			'3' => 'deferred update 3',
+			'2-1' => 'deferred update 1 within deferred update 2',
+		);
+		DeferredUpdates::addCallableUpdate(
+			function () use ( $updates ) {
+				echo $updates['1'];
+			}
+		);
+		DeferredUpdates::addCallableUpdate(
+			function () use ( $updates ) {
+				echo $updates['2'];
+				DeferredUpdates::addCallableUpdate(
+					function () use ( $updates ) {
+						echo $updates['2-1'];
+					}
+				);
+			}
+		);
+		DeferredUpdates::addCallableUpdate(
+			function () use ( $updates ) {
+				echo $updates[3];
+			}
+		);
+
+		$this->expectOutputString( implode( '', $updates ) );
+
+		DeferredUpdates::doUpdates();
+	}
+
+}