def test_uninstall_method_is_available(self):
product = InstalledProduct(self.package)
self.assertIsNotNone(
product.getUninstallMethod(),
'The package "{0}" has no uninstall external method defined,'
' or there is an error (e.g. ImportError) in your external'
' method, which might be swallowed silently by quick installer.'
' Take a look at the ftw.contentpage package for an example.'
.format(self.package))
