Clearing the pear cache helps, also in summary:
A) text_template has to be uninstalled before mock_object which it depends on
B) token_stream also has to be uninstalled as version 1.0.1 has to be installed before code_coverage which instils 1.1.1 as Scott put it
C) text_template has to be installed before mock_object which will install the 1.1.1
The final command listing that worked for me is (I am on windows so I just added sudo before pear for * nix ):
Sudo pear uninstall phpunit/phpunit
Sudo pear uninstall phpunit/dbunit
Sudo pear uninstall phpunit/php_codecoverage
Sudo pear uninstall phpunit/file_iterator
Sudo pear uninstall phpunit/php_timer
Sudo pear uninstall phpunit/phpunit_mockobject
Sudo pear uninstall phpunit/text_template
Sudo pear uninstall phpunit/phpunit_selenium
Sudo pear uninstall pear.symfony-project.com/yaml
Sudo pear uninstall phpunit/php_tokenstream
Sudo pear clear-Cache
sudo pear install pear.symfony-project.com/yaml-1.0.2
sudo pear install phpunit/PHPUnit_Selenium-1.0.1
sudo pear install phpunit/Text_Template-1.0.0
sudo pear install phpunit/PHPUnit_MockObject-1.0.3
sudo pear install phpunit/PHP_Timer-1.0.0
sudo pear install phpunit/File_Iterator-1.2.3
sudo pear install phpunit/PHP_TokenStream-1.0.1
sudo pear install phpunit/PHP_CodeCoverage-1.0.2
sudo pear install phpunit /DbUnit-1.0.0
sudo pear install phpunit/PHPUnit-3.5.15