Add test for ThrottledError exception

Change-Id: Ia98d6c24ce56c6707a67498e26107250d427a3bf

tests/phpunit/includes/exception/ThrottledErrorTest.php

@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * @covers ThrottledError
+ * @author Adam Shorland
+ */
+class ThrottledErrorTest extends MediaWikiTestCase {
+
+	protected $wgOut;
+
+	protected function setUp() {
+		parent::setUp();
+		global $wgOut;
+		$this->wgOut = clone $wgOut;
+	}
+
+	protected function tearDown() {
+		parent::tearDown();
+		global $wgOut;
+		$wgOut = $this->wgOut;
+	}
+
+	public function testExceptionSetsStatusCode() {
+		global $wgOut;
+		$wgOut = $this->getMockWgOut();
+		try{
+			throw new ThrottledError();
+		}
+		catch( ThrottledError $e ) {
+			$e->report();
+			$this->assertTrue( true );
+		}
+	}
+
+	private function getMockWgOut() {
+		$mock = $this->getMockBuilder( 'OutputPage' )
+			->disableOriginalConstructor()
+			->getMock();
+		$mock->expects( $this->once() )
+			->method( 'setStatusCode' )
+			->with( 503 );
+		return $mock;
+	}
+
+}