If you run just the coursecat unit tests you get fatal errors as course/lib.php hasn't been included.

vendor/bin/phpunit lib/tests/coursecatlib_test.php
Moodle 2.5beta+ (Build: 20130502), pgsql, 081bfdc5fff23b2c1eedcbfb35d49e1a7006d405
PHPUnit 3.7.19 by Sebastian Bergmann.

Configuration read from /var/www/integration/phpunit.xml

...PHP Fatal error: Call to undefined function get_category_or_system_context() in /var/www/integration/lib/coursecatlib.php on line 1491
PHP Stack trace:
PHP 1.

Unknown macro: {main}

() /var/www/integration/vendor/phpunit/phpunit/composer/bin/phpunit:0
PHP 2. PHPUnit_TextUI_Command::main() /var/www/integration/vendor/phpunit/phpunit/composer/bin/phpunit:63
PHP 3. PHPUnit_TextUI_Command->run() /var/www/integration/vendor/phpunit/phpunit/PHPUnit/TextUI/Command.php:129
PHP 4. PHPUnit_TextUI_TestRunner->doRun() /var/www/integration/vendor/phpunit/phpunit/PHPUnit/TextUI/Command.php:176
PHP 5. PHPUnit_Framework_TestSuite->run() /var/www/integration/vendor/phpunit/phpunit/PHPUnit/TextUI/TestRunner.php:349
PHP 6. PHPUnit_Framework_TestSuite->runTest() /var/www/integration/vendor/phpunit/phpunit/PHPUnit/Framework/TestSuite.php:745
PHP 7. PHPUnit_Framework_TestCase->run() /var/www/integration/vendor/phpunit/phpunit/PHPUnit/Framework/TestSuite.php:775
PHP 8. PHPUnit_Framework_TestResult->run() /var/www/integration/vendor/phpunit/phpunit/PHPUnit/Framework/TestCase.php:776
PHP 9. advanced_testcase->runBare() /var/www/integration/vendor/phpunit/phpunit/PHPUnit/Framework/TestResult.php:648
PHP 10. PHPUnit_Framework_TestCase->runBare() /var/www/integration/lib/phpunit/classes/advanced_testcase.php:76
PHP 11. PHPUnit_Framework_TestCase->runTest() /var/www/integration/vendor/phpunit/phpunit/PHPUnit/Framework/TestCase.php:831
PHP 12. ReflectionMethod->invokeArgs() /var/www/integration/vendor/phpunit/phpunit/PHPUnit/Framework/TestCase.php:976
PHP 13. coursecatlib_testcase->test_hierarchy() /var/www/integration/vendor/phpunit/phpunit/PHPUnit/Framework/TestCase.php:976
PHP 14. coursecat->can_change_parent() /var/www/integration/lib/tests/coursecatlib_test.php:218