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diff --git a/www/wiki/tests/phpunit/MediaWikiCoversValidator.php b/www/wiki/tests/phpunit/MediaWikiCoversValidator.php
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+<?php
+/**
+ * Copyright (C) 2017 Kunal Mehta <legoktm@member.fsf.org>
+ *
+ * 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.
+ *
+ */
+
+/**
+ * Trait that checks that covers tags are valid, since PHPUnit
+ * won't do it unless you run it with coverage, which is super
+ * slow.
+ *
+ * @since 1.31
+ */
+trait MediaWikiCoversValidator {
+
+	/**
+	 * Test that all methods in this class that begin
+	 * with "test" have valid covers tags.
+	 */
+	public function testValidCovers() {
+		$methods = get_class_methods( $this );
+		$class = get_class( $this );
+		$bad = '';
+		foreach ( $methods as $method ) {
+			if ( strpos( $method, 'test' ) === 0 ) {
+				try {
+					PHPUnit_Util_Test::getLinesToBeCovered( $class, $method );
+				} catch ( PHPUnit_Framework_CodeCoverageException $e ) {
+					$bad .= "$class::$method: {$e->getMessage()}\n";
+				}
+			}
+		}
+
+		$this->assertEquals( '', $bad );
+	}
+}