The support for layers provided by zope.testing helps to lessen the amount of time consumed during test driven development by sharing expensive test fixtures, such as is often requires for functional test. This package provides several well tested facilities to make writing and using layers faster and easier.

The collective.testcaselayer.common.common_layer, used in the Quick Start, also includes some commonly useful test fixtures:

• a mock mail host
• remove 'Unauthorized' and 'NotFound' from error_log ignored exceptions
• puts the resources registries in debug mode (portal_css, portal_javascripts, portal_kss)