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diff --git a/www/wiki/tests/phpunit/includes/title/SubpageImportTitleFactoryTest.php b/www/wiki/tests/phpunit/includes/title/SubpageImportTitleFactoryTest.php
new file mode 100644
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--- /dev/null
+++ b/www/wiki/tests/phpunit/includes/title/SubpageImportTitleFactoryTest.php
@@ -0,0 +1,86 @@
+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @author This, that and the other
+ */
+
+/**
+ * @covers SubpageImportTitleFactory
+ *
+ * @group Title
+ */
+class SubpageImportTitleFactoryTest extends MediaWikiTestCase {
+
+	protected function setUp() {
+		parent::setUp();
+
+		$this->setMwGlobals( [
+			'wgLanguageCode' => 'en',
+			'wgContLang' => Language::factory( 'en' ),
+			'wgNamespacesWithSubpages' => [ 0 => false, 2 => true ],
+		] );
+	}
+
+	public function basicProvider() {
+		return [
+			[
+				new ForeignTitle( 0, '', 'MainNamespaceArticle' ),
+				Title::newFromText( 'User:Graham' ),
+				Title::newFromText( 'User:Graham/MainNamespaceArticle' )
+			],
+			[
+				new ForeignTitle( 1, 'Discussion', 'Nice_talk' ),
+				Title::newFromText( 'User:Graham' ),
+				Title::newFromText( 'User:Graham/Discussion:Nice_talk' )
+			],
+			[
+				new ForeignTitle( 0, '', 'Bogus:Nice_talk' ),
+				Title::newFromText( 'User:Graham' ),
+				Title::newFromText( 'User:Graham/Bogus:Nice_talk' )
+			],
+		];
+	}
+
+	/**
+	 * @dataProvider basicProvider
+	 */
+	public function testBasic( ForeignTitle $foreignTitle, Title $rootPage,
+		Title $title
+	) {
+		$factory = new SubpageImportTitleFactory( $rootPage );
+		$testTitle = $factory->createTitleFromForeignTitle( $foreignTitle );
+
+		$this->assertTrue( $testTitle->equals( $title ) );
+	}
+
+	public function failureProvider() {
+		return [
+			[
+				Title::newFromText( 'Graham' ),
+			],
+		];
+	}
+
+	/**
+	 * @dataProvider failureProvider
+	 */
+	public function testFailures( Title $rootPage ) {
+		$this->setExpectedException( MWException::class );
+		new SubpageImportTitleFactory( $rootPage );
+	}
+}