def METHOD_NAME(self):
    """
    gem.update
    """
    self.run_function("gem.install", [self.OLD_GEM], version=self.OLD_VERSION)
    gem_list = self.run_function("gem.list", [self.OLD_GEM])
    self.assertEqual({self.OLD_GEM: [self.OLD_VERSION]}, gem_list)
    self.run_function("gem.update", [self.OLD_GEM])
    gem_list = self.run_function("gem.list", [self.OLD_GEM])
    self.assertEqual({self.OLD_GEM: [self.NEW_VERSION, self.OLD_VERSION]}, gem_list)
    self.run_function("gem.uninstall", [self.OLD_GEM])
    self.assertFalse(self.run_function("gem.list", [self.OLD_GEM]))