I have tried running the unit tests with both Echo and Math installed and ends up with a database error:

```
$ ls -1 extensions
Echo
Math
README
```

```
$ cd tests/phpunit
$ php phpunit.php --tap --testsuite extensions
not ok 588 - Error: MathDatabaseTest::testCreateTable
A database query error has occurred.
Query: DELETE FROM unittest_math
Function: MediaWikiTestCase::resetDB
Error: 1 no such table: unittest_math


---

#0 /core/includes/db/Database.php(1134): DatabaseBase->reportQueryError('no such table: ...', 1, 'DELETE FROM uni...', 'MediaWikiTestCa...', false)
#1 /core/includes/db/Database.php(2919): DatabaseBase->query('DELETE FROM uni...', 'MediaWikiTestCa...')
#2 /core/tests/phpunit/MediaWikiTestCase.php(572): DatabaseBase->delete('math', '*', 'MediaWikiTestCa...')
#3 /core/tests/phpunit/MediaWikiTestCase.php(138): MediaWikiTestCase->resetDB()
#4 /pear/PHPUnit/Framework/TestSuite.php(775): MediaWikiTestCase->run(Object(PHPUnit_Framework_TestResult))
#5 /pear/PHPUnit/Framework/TestSuite.php(745): PHPUnit_Framework_TestSuite->runTest(Object(MathDatabaseTest), Object(PHPUnit_Framework_TestResult))
#6 /pear/PHPUnit/Framework/TestSuite.php(705): PHPUnit_Framework_TestSuite->run(Object(PHPUnit_Framework_TestResult), false, Array, Array, false)
#7 /pear/PHPUnit/Framework/TestSuite.php(705): PHPUnit_Framework_TestSuite->run(Object(PHPUnit_Framework_TestResult), false, Array, Array, false)
#8 /pear/PHPUnit/Framework/TestSuite.php(705): PHPUnit_Framework_TestSuite->run(Object(PHPUnit_Framework_TestResult), false, Array, Array, false)
#9 /pear/PHPUnit/TextUI/TestRunner.php(349): PHPUnit_Framework_TestSuite->run(Object(PHPUnit_Framework_TestResult), false, Array, Array, false)
#10 /pear/PHPUnit/TextUI/Command.php(176): PHPUnit_TextUI_TestRunner->doRun(Object(PHPUnit_Framework_TestSuite), Array)
#11 /core/tests/phpunit/MediaWikiPHPUnitCommand.php(42): PHPUnit_TextUI_Command->run(Array, true)
#12 /core/tests/phpunit/phpunit.php(160): MediaWikiPHPUnitCommand::main()
#13 {main}
```


Also the Math extension seems to be running the updater in the test.

--------------------------
**Version**: unspecified
**Severity**: normal