1..6
# ->setPlugins() ->disablePlugins() ->enablePlugins() ->enableAllPluginsExcept()
ok 1 - ->setPlugins() throws an exception if called too late
ok 2 - ->disablePlugins() throws an exception if called too late
ok 3 - ->enablePlugins() throws an exception if called too late
ok 4 - ->enableAllPluginsExcept() throws an exception if called too late
ok 5 - ->enablePlugins() can enable plugins passed as arguments instead of array
# ->__construct()
ok 6 - ->__construct() throws an exception if a non-existant plugin is enabled
# Looks like everything went fine.