diff --git a/filter/algebra/tests/filter_test.php b/filter/algebra/tests/filter_test.php
deleted file mode 100644
index 6c7db8fbdad..00000000000
--- a/filter/algebra/tests/filter_test.php
+++ /dev/null
@@ -1,90 +0,0 @@
-<?php
-// This file is part of Moodle - http://moodle.org/
-//
-// Moodle 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 3 of the License, or
-// (at your option) any later version.
-//
-// Moodle 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 Moodle.  If not, see <http://www.gnu.org/licenses/>.
-
-/**
- * Unit test for the filter_algebra
- *
- * @package    filter_algebra
- * @category   phpunit
- * @copyright  2012 Tim Hunt
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
-
-defined('MOODLE_INTERNAL') || die();
-
-global $CFG;
-require_once($CFG->dirroot . '/filter/algebra/filter.php');
-
-
-/**
- * Unit tests for filter_algebra.
- *
- * Note that this only tests some of the filter logic. It does not acutally test
- * the normal case of the filter working, because I cannot make it work on my
- * test server, and if it does not work here, it probably does not also work
- * for other people. A failing test will be irritating noise.
- *
- * @copyright  2012 Tim Hunt
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
-class filter_algebra_testcase extends basic_testcase {
-
-    protected $filter;
-
-    protected function setUp() {
-        parent::setUp();
-        $this->filter = new filter_algebra(context_system::instance(), array());
-    }
-
-    function test_algebra_filter_no_algebra() {
-        $this->assertEquals('<p>Look no algebra!</p>',
-                $this->filter->filter('<p>Look no algebra!</p>'));
-    }
-
-
-    function test_algebra_filter_pluginfile() {
-        $this->assertEquals('<img src="@@PLUGINFILE@@/photo.jpg">',
-                $this->filter->filter('<img src="@@PLUGINFILE@@/photo.jpg">'));
-    }
-
-    function test_algebra_filter_draftfile() {
-        $this->assertEquals('<img src="@@DRAFTFILE@@/photo.jpg">',
-                $this->filter->filter('<img src="@@DRAFTFILE@@/photo.jpg">'));
-    }
-
-    function test_algebra_filter_unified_diff() {
-        $diff = '
-diff -u -r1.1 Worksheet.php
---- Worksheet.php   26 Sep 2003 04:18:02 -0000  1.1
-+++ Worksheet.php   18 Nov 2009 03:58:50 -0000
-@@ -1264,10 +1264,10 @@
-         }
-
-         // Strip the = or @ sign at the beginning of the formula string
--        if (ereg("^=",$formula)) {
-+        if (preg_match("/^=/",$formula)) {
-             $formula = preg_replace("/(^=)/","",$formula);
-         }
--        elseif(ereg("^@",$formula)) {
-+        elseif(preg_match("/^@/",$formula)) {
-             $formula = preg_replace("/(^@)/","",$formula);
-         }
-         else {
-';
-        $this->assertEquals('<pre>' . $diff . '</pre>',
-                $this->filter->filter('<pre>' . $diff . '</pre>'));
-    }
-}