Can't say it's a bad breakage, however something's different:
vagrant@mediawiki-vagrant:/vagrant/mediawiki$ mwscript tests/parser/parserTests.php --wiki=wiki --file=extensions/Graph/tests/parserTests.txt This is MediaWiki version 1.28.0-alpha. Running parser tests from "extensions/Graph/tests/parserTests.txt"... Running test <graph>... PASSED Running test <graph> - error handling... PASSED Passed 2 of 2 tests (100%)... ALL TESTS PASSED! vagrant@mediawiki-vagrant:/vagrant/mediawiki$ PHP=php7.0 mwscript tests/parser/parserTests.php --wiki=wiki --file=extensions/Graph/tests/parserTests.txt This is MediaWiki version 1.28.0-alpha. Running parser tests from "extensions/Graph/tests/parserTests.txt"... Running test <graph>... PASSED Running test <graph> - error handling... FAILED! --- /tmp/mwParser-1722784253-expected 2016-10-14 21:37:07.095632647 +0000 +++ /tmp/mwParser-1722784253-actual 2016-10-14 21:37:07.099632647 +0000 @@ -1,6 +1,6 @@ -<div class="mw-graph mw-graph-always" style="min-width:200px;min-height:200px" data-graph-id="4406ae21fb62ba4a67e041d0f9e026a2819e48a8"></div> -<div class="mw-graph mw-graph-always" style="min-width:200px;min-height:200px" data-graph-id="4406ae21fb62ba4a67e041d0f9e026a2819e48a8"></div> <p><span class="error">Syntax error</span> +<span class="error">Syntax error</span> +<span class="error">Syntax error</span> </p> <div class="mw-graph mw-graph-always" style="min-width:200px;min-height:200px" data-graph-id="4406ae21fb62ba4a67e041d0f9e026a2819e48a8"></div> Passed 1 of 2 tests (50%)... 1 tests failed!